Updated on 2025/11/08

写真a

 
ISHIHARA Takashi
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
Homepage
https://www.mtds.okayama-u.ac.jp/faculty_members/ishihara/
Profile

My research aims to elucidate and predict turbulent flow phenomena, by computational science techniques using supercomputers and new methods in data science and mathematical science.

External link

Degree

  • Doctor of Engineering ( Nagoya University )

Research Interests

  • CG

  • Spectral method

  • Direct Numerical Simulation

  • Parallel Numerical Computation

  • Fluid Mechanics

  • Computational Science of Turbulence

Research Areas

  • Informatics / Computational science

  • Natural Science / Applied mathematics and statistics

  • Natural Science / Basic mathematics

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

Education

  • Nagoya University   工学研究科   応用物理学

    - 1994

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    Country： Japan

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Research History

  • Faculty of Environmental, Life, Natural Science and Technology, Okayama University   Professor

    2023.4

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    Country：Japan

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  • Okayama University   Graduate School of Environmental and Life Science   Professor

    2017.8 - 2023.3

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  • Nagoya University   Graduate School of Engineering   Associate Professor

    2007.4 - 2017.7

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Professional Memberships

Committee Memberships

  • 日本流体力学会   代議員  

    2024.4 - 2026.3   

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    Committee type：Academic society

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  • 日本流体力学会   フェロー会員  

    2020.2   

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    Committee type：Academic society

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  • 日本流体力学会   理事  

    2020.2 - 2022.2   

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    Committee type：Academic society

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  • 日本流体力学会   代議員  

    2017.4 - 2019.3   

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    Committee type：Academic society

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  • 日本流体力学会   代議員  

    2014.4 - 2016.3   

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    Committee type：Academic society

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  • 日本流体力学会   代議員  

    2011.4 - 2013.3   

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    Committee type：Academic society

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Papers

  • Effects of finite arithmetic precision on large-scale direct numerical simulation of box turbulence by spectral method Reviewed

    Naoya Okamoto, Takashi Ishihara, Mitsuo Yokokawa, Yukio Kaneda

    Physical Review Fluids   10 ( 6 )   2025.6

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevfluids.10.064603

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevFluids.10.064603/fulltext

  • Direct numerical simulations of compressible turbulence in a periodic box: Effect of isothermal assumptions on turbulence statistics Reviewed

    Yoshiki Sakurai, Takashi Ishihara

    Physics of Fluids   36 ( 8 )   2024.8

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    Authorship：Last author   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Direct numerical simulations of compressible nonisothermal turbulence in a periodic box with up to 40963 grid points were conducted by varying Reynolds numbers and resolution levels. The results were compared with those of compressible isothermal turbulence by Sakurai and Ishihara [“Direct numerical simulations of compressible isothermal turbulence in a periodic box: Reynolds number and resolution-level dependence,” Phys. Rev. Fluids 8, 084606 (2023)] to study the effect of isothermal assumption on turbulence statistics. The turbulent Mach number and ratio of the dilatational to solenoidal root mean square velocities were fixed at approximately 0.3 and 0.4, respectively. A comparison under approximately equal flow conditions showed that the dilatational component of the energy spectra for the nonisothermal case exhibited approximately equal k−3 scaling at kη>1 as observed for the isothermal case and was consistently smaller in the wavenumber range 0.05<kη<0.6 than that for the isothermal case, where η is the Kolmogorov length. The dilatational energy is mainly dissipated around kη≈0.3, the same wavenumbers as the solenoidal energy dissipation irrespective of the isothermal assumption. As the Reynolds number increased, the dilatational energy dissipation caused by shocklets around kη≈2 became larger, especially in the nonisothermal case. It was found that the isothermal assumption weakened the intermittency of the velocity divergence. No significant differences were observed in the normalized mean energy dissipation rates and pressure statistics. The local flow topology was also marginally affected by the isothermal assumption; however, the difference was significantly less than the changes owing to the different values of parameters such as the Reynolds number and Mach number.

    DOI： 10.1063/5.0216518

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  • File I/O Cache Performance of Supercomputer Fugaku Using an Out-of-Core Direct Numerical Simulation Code of Turbulence Reviewed

    Yuto Hatanaka, Yuki Yamane, Kenta Yamaguchi, Takashi Soga, Akihiro Musa, Takashi Ishihara, Atsuya Uno, Kazuhiko Komatsu, Hiroaki Kobayashi, Mitsuo Yokokawa

    Computational Science – ICCS 2024   173 - 187   2024.6

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    Publishing type：Part of collection (book)   Publisher：Springer Nature Switzerland  

    DOI： 10.1007/978-3-031-63778-0_13

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  • An Asymptotic Parallel Linear Solver and Its Application to Direct Numerical Simulation for Compressible Turbulence Reviewed

    Mitsuo Yokokawa, Taiki Matsumoto, Ryo Takegami, Yukiya Sugiura, Naoki Watanabe, Yoshiki Sakurai, Takashi Ishihara, Kazuhiko Komatsu, Hiroaki Kobayashi

    Computational Science – ICCS 2024   383 - 397   2024.6

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    Publishing type：Part of collection (book)   Publisher：Springer Nature Switzerland  

    DOI： 10.1007/978-3-031-63751-3_26

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  • Intermittency across Reynolds numbers – the influence of large-scale shear layers on the scaling of the enstrophy and dissipation in homogenous isotropic turbulence Reviewed

    G.E. Elsinga, T. Ishihara, J.C.R. Hunt

    Journal of Fluid Mechanics   974   2023.10

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    Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

    Direct numerical simulations up to Reλ = 1445 show that the scaling exponents for the enstrophy and the dissipation rate extrema are different and depend on the Reynolds number. A similar Reynolds number dependence of the scaling exponents is observed for the moments of the dissipation rate, but not for the moments of the enstrophy. Significant changes in the exponents occur at approximately Reλ ≈ 250, where Reλ is the Taylor based Reynolds number, which coincides with structural changes in the flow, in particular the development of large-scale shear layers. A model for the probability density functions (PDFs) of the enstrophy and dissipate rate is presented, which is an extension of our existing model (Proc. R. Soc. A, vol. 476, 2020, p. 20200591) and is based on the mentioned development of large-scale layer regions within the flow. This model is able to capture the observed Reynolds number dependencies of the scaling exponents, in contrast to the existing theories which yield constant exponents. Moreover, the model reconciles the scaling at finite Reynolds number with the theoretical limit, where the enstrophy and dissipation rate scale identically at infinite Reynolds number. It suggests that the large-scale shear layers are vital for understanding the scaling of the extrema. Furthermore, to reach the theoretical limit, the scaling exponents must remain Reynolds number dependent beyond the present Reλ range.

    DOI： 10.1017/jfm.2023.799

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  • Direct numerical simulations of compressible isothermal turbulence in a periodic box: Reynolds number and resolution-level dependence Reviewed

    Yoshiki Sakurai, Takashi Ishihara

    Physical Review Fluids   8 ( 8 )   084606-1 - 084606-24   2023.8

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevfluids.8.084606

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevFluids.8.084606/fulltext

  • I/O Performance Evaluation of a Memory-Saving DNS Code on SX-Aurora TSUBASA Reviewed

    Mitsuo Yokokawa, Yuki Yamane, Kenta Yamaguchi, Takashi Soga, Taiki Matsumoto, Akihiro Musa, Kazuhiko Komatsu, Takashi Ishihara, Hiroaki Kobayashi

    2023 IEEE International Parallel and Distributed Processing Symposium Workshops (IPDPSW)   2023.5

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    Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/ipdpsw59300.2023.00117

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  • Performance evaluation of parallel direct numerical simulation code on supercomputer SX-Aurora TSUBASA Reviewed

    Mitsuo Yokokawa, Yujiro Takenaka, Takashi Ishihara, Kazuhiko Komatsu, Hiroaki Kobayashi

    Computers and Fluids   261   105913 - 105913   2023.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.compfluid.2023.105913

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  • Non-local dispersion and the reassessment of Richardson's t3-scaling law Reviewed

    G.E. Elsinga, T. Ishihara, J.C.R. Hunt

    Journal of Fluid Mechanics   932   A17-1 - A17-32   2022.2

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    Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

    The Richardson-scaling law states that the mean square separation of a fluid particle pair grows according to <italic>t</italic>3 within the inertial range and at intermediate times. The theories predicting this scaling regime assume that the pair separation is within the inertial range and that the dispersion is local, which means that only eddies at the scale of the separation contribute. These assumptions ignore the structural organization of the turbulent flow into large-scale shear layers, where the intense small-scale motions are bounded by the large-scale energetic motions. Therefore, the large scales contribute to the velocity difference across the small-scale structures. It is shown that, indeed, the pair dispersion inside these layers is highly non-local and approaches Taylor dispersion in a way that is fundamentally different from the Richardson-scaling law. Also, the layer's contribution to the overall mean square separation remains significant as the Reynolds number increases. This calls into question the validity of the theoretical assumptions. Moreover, a literature survey reveals that, so far, <italic>t</italic>3 scaling is not observed for initial separations within the inertial range. We propose that the intermediate pair dispersion regime is a transition region that connects the initial Batchelor- with the final Taylor-dispersion regime. Such a simple interpretation is shown to be consistent with observations and is able to explain why <italic>t</italic>3 scaling is found only for one specific initial separation outside the inertial range. Moreover, the model incorporates the observed non-local contribution to the dispersion, because it requires only small-time-scale properties and large-scale properties.

    DOI： 10.1017/jfm.2021.989

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  • Statistics of local Reynolds number in box turbulence: ratio of inertial to viscous forces Reviewed

    Yukio Kaneda, Takashi Ishihara, Koji Morishita, Mitsuo Yokokawa, Atsuya Uno

    Journal of Fluid Mechanics   929   A1-1 - A1-19   2021.12

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    Publishing type：Research paper (scientific journal)   Publisher：Cambridge University Press (CUP)  

    In high-Reynolds-number turbulence the spatial distribution of velocity fluctuation at small scales is strongly non-uniform. In accordance with the non-uniformity, the distributions of the inertial and viscous forces are also non-uniform. According to direct numerical simulation (DNS) of forced turbulence of an incompressible fluid obeying the Navier–Stokes equation in a periodic box at the Taylor microscale Reynolds number <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline1.png" />
    <tex-math>$R_\lambda \approx 1100$</tex-math>
    </alternatives>
    </inline-formula>, the average <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline2.png" />
    <tex-math>$\langle R_{loc}\rangle$</tex-math>
    </alternatives>
    </inline-formula> over the space of the ‘local Reynolds number’ <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline3.png" />
    <tex-math>$R_ {loc}$</tex-math>
    </alternatives>
    </inline-formula>, which is defined as the ratio of inertial to viscous forces at each point in the flow, is much smaller than the conventional ‘Reynolds number’ given by <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline4.png" />
    <tex-math>$Re \equiv UL/\nu$</tex-math>
    </alternatives>
    </inline-formula>, where <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline5.png" />
    <tex-math>$U$</tex-math>
    </alternatives>
    </inline-formula> and <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline6.png" />
    <tex-math>$L$</tex-math>
    </alternatives>
    </inline-formula> are the characteristic velocity and length of the energy-containing eddies, and <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline7.png" />
    <tex-math>$\nu$</tex-math>
    </alternatives>
    </inline-formula> is the kinematic viscosity. While both conditional averages of the inertial and viscous forces for a given squared vorticity <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline8.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula> increase with <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline9.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula> at large <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline10.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula>, the conditional average of <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline11.png" />
    <tex-math>$R_ {loc}$</tex-math>
    </alternatives>
    </inline-formula> is almost independent of <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline12.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula>. A comparison of the DNS field with a random structureless velocity field suggests that the increase in the conditional average of <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline13.png" />
    <tex-math>$R_ {loc}$</tex-math>
    </alternatives>
    </inline-formula> with <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline14.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula> at large <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline15.png" />
    <tex-math>$\omega ^{2}$</tex-math>
    </alternatives>
    </inline-formula> is suppressed by the Navier–Stokes dynamics. Something similar is also true for the conditional averages for a given local energy dissipation rate per unit mass. Certain features of intermittency effects such as that on the <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline16.png" />
    <tex-math>$Re$</tex-math>
    </alternatives>
    </inline-formula> dependence of <inline-formula>
    <alternatives>
    <inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="png" xlink:href="S0022112021008065_inline17.png" />
    <tex-math>$\langle R_{loc}\rangle$</tex-math>
    </alternatives>
    </inline-formula> are explained by a multi-fractal model by Dubrulle (<italic>J. Fluid Mech.</italic>, vol. 867, 2019, P1).

    DOI： 10.1017/jfm.2021.806

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  • Effects of the Compressibility of Turbulence on the Dust Coagulation Process in Protoplanetary Disks Reviewed

    Yoshiki Sakurai, Takashi Ishihara, Hitomi Furuya, Masayuki Umemura, Kenji Shiraishi

    The Astrophysical Journal   911 ( 2 )   140 - 140   2021.4

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    Authorship：Last author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Astronomical Society  

    DOI： 10.3847/1538-4357/abe9ba

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    Other Link： https://iopscience.iop.org/article/10.3847/1538-4357/abe9ba/pdf

  • Optimizations of DNS Codes for Turbulence on SX-Aurora TSUBASA

    Yujiro Takenaka, Mitsuo Yokokawa, Takashi Ishihara, Kazuhiko Komatsu, Hiroaki Kobayashi

    Sustained Simulation Performance 2019 and 2020   51 - 59   2021

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    Publishing type：Part of collection (book)   Publisher：Springer International Publishing  

    DOI： 10.1007/978-3-030-68049-7_4

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  • Drastic Changes of Turbulence in the Ignition Process of an n-Heptane/Air Mixture

    Takashi Ishihara, Ryousuke Kuno

    Lecture Notes in Mechanical Engineering   205 - 209   2021

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    Authorship：Lead author   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/978-981-33-4960-5_32

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  • Thin Shear Layers in High-resolution Direct Numerical Simulations of Turbulence

    Takashi Ishihara, Koji Morishita, J. C.R. Hunt

    Notes on Numerical Fluid Mechanics and Multidisciplinary Design   147   517 - 526   2021

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    Publishing type：Part of collection (book)  

    DOI： 10.1007/978-3-030-55594-8_43

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  • Extreme dissipation and intermittency in turbulence at very high Reynolds numbers Reviewed

    Gerrit E. Elsinga, Takashi Ishihara, Julian C. R. Hunt

    Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences   476 ( 2243 )   20200591 - 20200591   2020.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Royal Society  

    DOI： 10.1098/rspa.2020.0591

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    Other Link： https://royalsocietypublishing.org/doi/full-xml/10.1098/rspa.2020.0591

  • Second-order velocity structure functions in direct numerical simulations of turbulence with Rλ up to 2250 Reviewed

    Takashi Ishihara, Yukio Kaneda, Koji Morishita, Mitsuo Yokokawa, Atsuya Uno

    Physical Review Fluids   5 ( 10 )   104608-1 - 104608-15   2020.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physrevfluids.5.104608

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevFluids.5.104608/fulltext

  • Thin shear layers in high Reynolds number turbulence - A coherent-structure model

    J. C.R. Hunt, T. Ishihara, Y. Kaneda

    ETC 2013 - 14th European Turbulence Conference   2020

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    Publishing type：Research paper (international conference proceedings)  

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  • Dynamic geometrical analysis of high-enstrophy structures in isotropic turbulence

    Yuji Hattori, Takashi Ishihara

    ETC 2013 - 14th European Turbulence Conference   2020

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    Publishing type：Research paper (international conference proceedings)  

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  • Estimation of turbulence-development by a multifractal theory

    Toshihico Arimitsu, Naoko Arimitsu, Kohei Takechi, Yukio Kaneda, Takashi Ishihara

    ETC 2013 - 14th European Turbulence Conference   2020

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    Publishing type：Research paper (international conference proceedings)  

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  • Thin shear layers in high Reynolds number turbulence - DNS results

    T. Ishihara, J. C.R. Hunt, Y. Kaneda

    ETC 2013 - 14th European Turbulence Conference   2020

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    Publishing type：Research paper (international conference proceedings)  

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  • Performance of a Two-Path Aliasing Free Calculation of a Spectral DNS Code Reviewed

    Mitsuo Yokokawa, Koji Morishita, Takashi Ishihara, Atsuya Uno, Yukio Kaneda

    ICCS 2019. Lecture Notes in Computer Science   11539   587 - 595   2019.6

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/978-3-030-22747-0_44

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  • Length Scales in Turbulent Channel Flow Reviewed

    K Morishita, T Ishihara, Y Kaneda

    Journal of the Physical Society of Japan   88 ( 6 )   064401   2019.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.7566/JPSJ.88.064401

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  • DISTRIBUTION AND MOTION OF INERTIAL PARTICLES AROUND HIGH VORTICITY REGIONS IN COARSE-GRAINED HOMOGENEOUS ISOTROPIC TURBULENCE

    Yoshiki SAKURAI, Hiroki SHIRAISHI, Takashi ISHIHARA

    Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))   75 ( 2 )   I_509 - I_518   2019

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    Publishing type：Research paper (scientific journal)   Publisher：Japan Society of Civil Engineers  

    DOI： 10.2208/jscejam.75.2_i_509

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  • Relationships between Small-scale Fluid Motions and Inertial Particle Clustering in Turbulence Reviewed

    Yoshiki Sakurai, Takashi Ishihara

    Journal of the Physical Society of Japan   87 ( 9 )   093401 - 0934014   2018.8

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    Authorship：Last author   Publishing type：Research paper (scientific journal)  

    DOI： 10.7566/JPSJ.87.093401

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  • Dust Coagulation Regulated by Turbulent Clustering in Protoplanetary Disks Reviewed

    Takashi Ishihara, Naoki Kobayashi, Kei Enohata, Masayuki Umemura, Kenji Shiraishi

    ASTROPHYSICAL JOURNAL   854 ( 2 )   81   2018.2

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3847/1538-4357/aaa976

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  • The scaling of straining motions in homogeneous isotropic turbulence Reviewed

    GE Elsinga, T Ishihara, MV Goudar, CB da Silva, JCR Hunt

    Journal of Fluid Mechanics   829   31 - 64   2017.9

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1017/jfm.2017.538

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  • Coherent structure extraction in turbulent channel flow using boundary adapted wavelets Reviewed

    Teluo Sakurai, Katsunori Yoshimatsu, Kai Schneider, Marie Farge, Koji Morishita, Takashi Ishihara

    JOURNAL OF TURBULENCE   18 ( 4 )   352 - 372   2017

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1080/14685248.2017.1284326

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  • Energy spectrum in high-resolution direct numerical simulations of turbulence Reviewed

    Takashi Ishihara, Koji Morishita, Mitsuo Yokokawa, Atsuya Uno, Yukio Kaneda

    PHYSICAL REVIEW FLUIDS   1 ( 8 )   082403   2016.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevFluids.1.082403

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  • A new statistical tool to study the geometry of intense vorticity clusters in turbulence Reviewed

    Alberto Vela-Martin, Takashi Ishihara

    2ND MULTIFLOW SUMMER SCHOOL ON TURBULENCE   708 ( 708 )   012004   2016

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1088/1742-6596/708/1/012004

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  • Turbulence Near Interfaces-Modelling and Simulations Reviewed

    J. C. R. Hunt, T. Ishihara, D. Szubert, I. Asproulias, Y. Hoarau, M. Braza

    ADVANCES IN FLUID-STRUCTURE INTERACTION   133 ( 133 )   283 - 292   2016

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/978-3-319-27386-0_17

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  • 22aBU-9 Two-Point Statistics in Log-Law Region of Wall Bounded Turbulence : DNS-Data Analysis

    Kaneda Y., Morishita K., Ishihara T.

    Meeting Abstracts of the Physical Society of Japan   71   3108 - 3108   2016

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    Language：Japanese   Publisher：The Physical Society of Japan (JPS)  

    DOI： 10.11316/jpsgaiyo.71.1.0_3108

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  • 高レイノルズ数乱流中の渦の組織構造とその時間発展

    石原 卓, 宇野 篤也, 森下 浩二, YOKOKAWA MITSUO, 金田 行雄

    第29回数値流体力学シンポジウム講演論文集   2015   1 - 5   2015.12

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    Language：Japanese   Publishing type：Research paper (conference, symposium, etc.)   Publisher：日本流体力学会  

    High vorticity regions obtained by the large-scale direct numerical simulations with up to 122883 grid points, of forced incompressible turbulence in a periodic box are visualized using the method developed for handling such large-scale data. The visualization shows that in high Reynolds number turbulence, strong micro-scale vortices are dense in clusters of various sizes up to

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  • Analysis of conditional statistics obtained near the turbulent/non-turbulent interface of turbulent boundary layers Reviewed

    Takashi Ishihara, Hiroki Ogasawara, Julian C. R. Hunt

    JOURNAL OF FLUIDS AND STRUCTURES   53   50 - 57   2015.2

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    DOI： 10.1016/j.jfluidstructs.2014.10.008

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  • Accurate Parallel Algorithm for Tracking Inertial Particles in Large-Scale Direct Numerical Simulations of Turbulence

    Takashi Ishihara, Kei Enohata, Koji Morishita, Mitsuo Yokokawa, Katsuya Ishii

    PARALLEL COMPUTING TECHNOLOGIES (PACT 2015)   9251   522 - 527   2015

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    DOI： 10.1007/978-3-319-21909-7_51

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  • External and Internal interfacial turbulent shear layers

    Julian Hunt, Takashi Ishihara, Jerke Eisma, Wim Paul Breugen, Jerry Westerweel, Marianna Braza

    Proceedings - 15th European Turbulence Conference, ETC 2015   2015

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  • A DNS study of the effects of temperature non-uniformity and turbulence on an auto-ignition process in a homogeneous n-heptane/air mixture Reviewed

    ISHIHARA Takashi, ITO Takamasa, MIKI Takashi, YOSHIMATSU Katsunori, TERAJI Atsushi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A   80 ( 820 )   1-9 - TEP0361   2014.12

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    We examine the effects of temperature non-uniformity and turbulence on homogeneous charge compression ignition (HCCI) of a homogeneous n-heptane/air mixture, using three-dimensional direct numerical simulations of the mixture flows. We use a reduced chemical reaction model for the HCCI combustion. Time evolutions of the flows are obtained under the initial conditions having three different initial velocity fluctuations at 4.0 MPa and with temperature fluctuation around 781 K. Heat-release by the low-temperature oxidation, a key reaction in the ignition process, is analyzed along the trajectories of the temperature gradients, using dissipation-elements decomposition of the temperature fields. It is shown that the high heat-release rate occurs in the membrane-like regions where the temperature is about 870 K. The membrane-like regions move along the trajectories from high to low temperature. The analysis on the trajectories shows that the conditionally averaged moving speed and thickness of the regions are decreasing functions of the magnitude of temperature gradient. When the velocity fluctuation is strong, the turbulent flow is found to play a key role in retarding the ignition: The turbulent flow reduces the maximum temperature and slows down the averaged moving speed of the membrane-like regions.

    DOI： 10.1299/transjsme.2014tep0

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  • Thin Shear Layer Structures in High Reynolds Number Turbulence Tomographic Experiments and a Local Distortion Model

    Julian C. R. Hunt, Takashi Ishihara, Nicholas A. Worth, Yukio Kaneda

    FLOW TURBULENCE AND COMBUSTION   92 ( 3 )   607 - 649   2014.3

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    DOI： 10.1007/s10494-013-9518-0

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  • Thin Shear Layers in High Reynolds Number Turbulence-DNS Results Reviewed

    Takashi Ishihara, Yukio Kaneda, Julian C. R. Hunt

    FLOW TURBULENCE AND COMBUSTION   91 ( 4 )   895 - 929   2013.12

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    DOI： 10.1007/s10494-013-9499-z

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  • 3D DNS analysis of interaction between turbulence and chemical reaction in an auto-ignition process under homogeneous n-heptane mixture Reviewed

    Atsushi Teraji, Hironari Ikuta, Takashi Miki, Takashi Ishihara

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   79 ( 799 )   431 - 438   2013

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    DOI： 10.1299/kikaib.79.431

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  • Small-scale statistics in direct numerical simulation of turbulent channel flow at high-Reynolds number Reviewed

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    13TH EUROPEAN TURBULENCE CONFERENCE (ETC13): WALL-BOUNDED FLOWS AND CONTROL OF TURBULENCE   318 ( SECTION 2 )   022016   2011

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    DOI： 10.1088/1742-6596/318/2/022016

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  • Conditional analysis near strong shear layers in DNS of isotropic turbulence at high Reynolds number Reviewed

    Takashi Ishihara, Julian C. R. Hunt, Yukio Kaneda

    13TH EUROPEAN TURBULENCE CONFERENCE (ETC13): STATISTICAL ASPECTS, MODELLING AND SIMULATIONS OF TURBULENCE   318 ( SECTION 4 )   042004   2011

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    DOI： 10.1088/1742-6596/318/4/042004

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  • Numerical analysis of intermediate species diffusion effect on low temperature oxidation in a homogeneous n-heptane mixture Reviewed

    Atsushi Teraji, Masashi Nishida, Takahiro Morikawa, Takashi Ishihara, Yukio Kaneda

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   77 ( 779 )   1592 - 1600   2011

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    DOI： 10.1299/kikaib.77.1592

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  • Study of High-Reynolds Number Isotropic Turbulence by Direct Numerical Simulation Reviewed

    Takashi Ishihara, Toshiyuki Gotoh, Yukio Kaneda

    ANNUAL REVIEW OF FLUID MECHANICS   41   165 - 180   2009

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  • Examination of Kolmogorov's 4/5 law by high-resolution direct numerical simulation data of turbulence Reviewed

    Yukio Kaneda, Junya Yoshino, Takashi Ishihara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   77 ( 6 )   064401   2008.6

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    DOI： 10.1143/JPSJ.77.064401

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  • Small-scale statistics in high-resolution direct numerical simulation of turbulence: Reynolds number dependence of one-point velocity gradient statistics Reviewed

    T. Ishihara, Y. Kaneda, M. Yokokawa, K. Itakura, A. Uno

    JOURNAL OF FLUID MECHANICS   592   335 - 366   2007.12

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    DOI： 10.1017/S0022112007008531

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  • Introduction to Spectral Methods

    Ishihara Takashi

    Bulletin of the Japan Society for Industrial and Applied Mathematics   15 ( 3 )   280 - 281   2005

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    DOI： 10.11540/bjsiam.15.3_280

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  • Similarity scaling of pressure fluctuation in turbulence

    Yoshiyuki Tsuji, Takashi Ishihara

    Physical Review E - Statistical, Nonlinear, and Soft Matter Physics   68 ( 2 2 )   2003.8

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Books

  • 理工系の数理 ベクトル解析

    山本, 有作, 石原, 卓（ Role： Joint author）

    裳華房  2020.11  （ ISBN:9784785315894 ）

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  • 理工学のための数値計算法[第3版]

    水島 二郎, 柳瀬 眞一郎, 石原 卓（ Role： Joint author）

    数理工学社  2019.11 

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  • 乱流の計算科学 - 乱流解明のツールとしての大規模数値シミュレーション

    金田行雄, 石井克哉, 石原 卓, 岩本 薫, 吉田 恭, 芳松克則, 半場藤弘（ Role： Joint author）

    共立出版  2012.7 

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MISC

  • Direct Numerical Simulations of Navier-Stokes Equation in Astrophysics : The Growth of Dust Grains in Protoplanetary Disk Turbulence Invited

    Masayuki Umemura, Takashi Ishihara

    39 ( 2 )   101 - 107   2020.6

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  • Large-scale Direct Numerical Simulations of Homogeneous Isotropic Turbulence Invited

    38 ( 2 )   74 - 78   2019.6

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  • 高レイノルズ数乱流中の渦の組織構造とその時間発展 Invited Reviewed

    ISHIHARA TAKASHI, UNO ATSUYA, MORISHITA KOJI, YOKOKAWA MITSUO, KANEDA YUKIO

    ながれ   35 ( 2 )   109 - 113   2016

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  • Turbulence Near Interfaces-Modelling and Simulations

    J. C. R. Hunt, T. Ishihara, D. Szubert, I. Asproulias, Y. Hoarau, M. Braza

    ADVANCES IN FLUID-STRUCTURE INTERACTION   133   283 - 292   2016

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    DOI： 10.1007/978-3-319-27386-0_17

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  • Coherent vorticity in turbulent channel flow: a wavelet viewpoint

    Katsunori Yoshimatsu, Teluo Sakurai, Kai Schneider, Marie Farge, Koji Morishita, Takashi Ishihara

    Proceedings of Ninth International Symposium on Turbulence and Shear Flow Phenomena   2   -   2015.7

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  • 自然や人工系の流体シミュレーション Invited

    石原 卓

    パリティ   30 ( 6 )   34-36   2015.6

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  • 18pCW-10 Energy spectrum in high-resolution direct numerical simulations of turbulence

    Ishihara T., Morishita K., Yokokawa M., Uno A., Kaneda Y.

    Meeting Abstracts of the Physical Society of Japan   70 ( 0 )   2807 - 2807   2015

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    DOI： 10.11316/jpsgaiyo.70.2.0_2807

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  • 一様等方性乱流の直接数値シミュレーションコードの京コンピュータ向け最適化

    森下 浩二, 横川 三津夫, 宇野 篤也, 石原 卓, 金田 行雄

    情報処理学会研究報告. [ハイパフォーマンスコンピューティング]   2014 ( 17 )   1 - 5   2014.12

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    現在日本最速のスーパーコンピュータである 「京」 を用いて,一様等方性乱流の超大規模直接数値シミュレーション (DNS) を実現するために,地球シミュレータ向けに開発された,フーリエ・スペクトル法に基づく一様等方性乱流の DNS コードの 「京」 への移植,及び最適化を行った.移植の際には,従来の 1 次元分割によるデータ分散手法から,より効率的な All-to-all 通信が可能であると考えられる 2 次元分割による手法へと変更を行った.その結果,「京」 の 192×128 ノードを用いて最大格子点数 122883 の超大規模 DNS の実現に成功した.これはプロダクトランとしては世界最大の一様等方性乱流の DNS である.ピーク性能比として,格子点数 61443,81923,122883 の DNS でそれぞれ 3.84%,3.14%,2.24% の実効性能が得られた.また,コードの更なる高効率化のために,乱流 DNS 特有のアルゴリズムに対する最適化を試み,その性能評価を行った.

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  • 一様等方性乱流の直接数値シミュレーションコードの京コンピュータ向け最適化

    森下 浩二, 横川 三津夫, 宇野 篤也, 石原 卓, 金田 行雄

    情報処理学会研究報告. 計算機アーキテクチャ研究会報告   2014 ( 17 )   1 - 5   2014.12

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    現在日本最速のスーパーコンピュータである 「京」 を用いて,一様等方性乱流の超大規模直接数値シミュレーション (DNS) を実現するために,地球シミュレータ向けに開発された,フーリエ・スペクトル法に基づく一様等方性乱流の DNS コードの 「京」 への移植,及び最適化を行った.移植の際には,従来の 1 次元分割によるデータ分散手法から,より効率的な All-to-all 通信が可能であると考えられる 2 次元分割による手法へと変更を行った.その結果,「京」 の 192×128 ノードを用いて最大格子点数 122883 の超大規模 DNS の実現に成功した.これはプロダクトランとしては世界最大の一様等方性乱流の DNS である.ピーク性能比として,格子点数 61443,81923,122883 の DNS でそれぞれ 3.84%,3.14%,2.24% の実効性能が得られた.また,コードの更なる高効率化のために,乱流 DNS 特有のアルゴリズムに対する最適化を試み,その性能評価を行った.

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  • 高レイノルズ数乱流中の強い渦の組織構造 (偏微分方程式の背後にある確率過程と解の族が示す統計力学的な現象の解析)

    石原 卓

    数理解析研究所講究録   1919   35 - 37   2014.9

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    Other Link： http://hdl.handle.net/2433/223374

  • 高レイノルズ数乱流中の強い渦の組織構造

    石原 卓

    偏微分方程式の背後にある確立過程と解の族が示す統計力学的な現象の解析 Stochastic Processes and Statistical Phenomena behind RDFs RIMS共同研究報告集   ( 1919 )   35-37   2014

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  • Dynamic Geometrical Analysis of High-Vorticity Regions in Isotropic Turbulence

    Hattori Yuji, Ishihara Takashi

    Meeting abstracts of the Physical Society of Japan   68 ( 2 )   228 - 228   2013.8

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  • Small scale universality and spectral characteristics in turbulent flows Reviewed

    Yukio Kaneda, Koji Morishita, Takashi Ishihara

    Proceedings of TSFP-8 (2013) Poitiers   1   1-6   2013.8

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  • Direct Numerical Simulations of Fundamental Turbulent Flows with the World's Largest Number of Grid-points and Application to Modeling of Engineering Turbulent Flows

    Annual report of the Earth Simulator Center   149 - 154   2013.4

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  • Study of two elements constituting turbulence by a multifractal theory for probability density functions - Through the analyses of 4096(3) DNS

    T. Arimitsu, N. Arimitsu, K. Takechi, Y. Kaneda, T. Ishihara

    IC-MSQUARE 2012: INTERNATIONAL CONFERENCE ON MATHEMATICAL MODELLING IN PHYSICAL SCIENCES   410 ( 1 )   012083   2013

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  • Conditional analysis of statistics obtained near the turbulent-nonturbulent interface of turbulent boundary layers

    T. Ishihara, H. Ogasawara

    Proceedings of ERCOFTAC SYMPOSIUM on Unsteady Separation in Fluid-Structure Interaction   399-403   2013

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  • Volume Penalization法による翼果まわりの流れの数値解析

    澤村陽一, 石原 卓

    生物流体力学及び関連する問題の研究Study of bio-fluid mechanics and related problems RIMS 共同研究報告集   1808   101-120 - 120   2012.9

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    Other Link： http://hdl.handle.net/2433/194442

  • 4D visualization of isotropic turbulence and dynamics of high-enstrophy structures Reviewed

    Yuji Hattori, Takashi Ishihara

    USB Proceedings of JSST 2012 International Conference on Simulation Technology   - ( - )   170-174   2012.9

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  • Interactive visualizations of the large-scale data generated by the DNS of isotropic turbulence on 40963 grid points Reviewed

    Takashi Ishihara, Kensaku Mori

    USB Proceedings of JSST 2012 International Conference on Simulation Technology   - ( - )   175-177   2012.9

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  • Improvement of Reality of CG Motion Pictures by Hydrodynamic Effects: Effects of Turbulence Reviewed

    Takashi Ishihara, Yuji Hattori

    Ninth International Conference on Flow Dynamics   - ( - )   -   2012.9

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  • 19aAA-11 Analysis of 4096^3DNS turbulence by Multifractal PDF theory

    Takechi K., Arimitsu N., Arimitsu T., Kaneda Y., Ishihra T.

    Meeting abstracts of the Physical Society of Japan   67 ( 2 )   240 - 240   2012.8

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  • Velocity-Dependent Actomyosin ATPase Cycle Revealed by In Vitro Motility Assay with Kinetic Analysis Reviewed

    Masaaki K. Sato, Takashi Ishihara, Hiroto Tanaka, Akihiko Ishijima, Yuichi Inoue

    BIOPHYSICAL JOURNAL   103 ( 4 )   711 - 718   2012.8

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  • OS3-7 Numerical Analysis of Effect of Intermediate Species Diffusion on Low Temperature Oxidation Process in a Homogeneous n-Heptane Mixture(OS3 Application of chemical kinetics to combustion modeling,Organized Session Papers)

    Teraji Atsushi, Ishihara Takashi, Kaneda Yukio

    The ... international symposium on diagnostics and modeling of combustion in internal combustion engines   2012 ( 8 )   152 - 157   2012.7

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    A two-dimensional direct numerical simulation (DNS) was applied to investigate the autoignition process of an n-heptane/air mixture. The diffusion of intermediate species was studied in terms of the influence on the ignition delay period and the chemical reaction process. A simplified reaction mechanism was used in this study. The influence of turbulence was investigated by comparing the results of a zero-dimensional simulation and two-dimensional direct simulation of a non-turbulence condition. It was found that the ignition delay period was strongly affected by the different diffusion rates of intermediate species. It was shown that the outflow of OH radicals having a larger diffusion coefficient reduces the reaction rate at the high temperature point. In contrast, the reaction rate was enhanced by the influx of OH radicals at the low temperature point.

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  • Numerical Analysis of Effect of Intermediate Species Diffusion on Low Temperature Oxidation Process in a Homogeneous n-Heptane Mixture Reviewed

    Atsushi Teraji, Takashi Ishihara, Yukio Kaneda

    Proc. COMODIA 2012   - ( - )   152-157 - 157   2012

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  • Energy Dissipation Rate and Energy Spectrum in High Resolution Direct Numerical Simulations of Turbulence in a Periodic Box(Special Reviews by RONBUN - Prize Award)

    KANEDA Yukio, ISHIHARA Takashi, YOKOKAWA Mitsuo, ITAKURA Ken'ichi, UNO Atsuya, Yukio KANEDA, Takashi ISHIHARA, Mitsuo YOKOKAWA, Ken'ichi ITAKURA, Atsuya UNO, Center for General Education Aichi Institute of Technology, Graduate School of Engineering Nagoya University

    31 ( 3 )   241-244 - 244   2012

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    Other Link： https://projects.repo.nii.ac.jp/?action=repository_uri&item_id=377158

  • 23pGS-1 Analysis of 4096^3DNS turbulence by Multifractal PDF theory

    Arimitsu N., Takechi K., Arimitsu T., Kaneda Y., Ishihara T.

    Meeting abstracts of the Physical Society of Japan   66 ( 2 )   279 - 279   2011.8

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  • 25pTC-16 Analysis of 4096^3DNS turbulence by Multifractal PDF theory

    Arimitsu N., Takechi K., Arimitsu T., Kaneda Y., Ishihra T.

    Meeting abstracts of the Physical Society of Japan   66 ( 1 )   289 - 289   2011.3

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  • Improvement of Reality of CG Motion Pictures by Hydrodynamic Effects Reviewed

    Takashi Ishihara, Yuji Hattori

    Proceedings of the Eleventh International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration   48-49   2011

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  • Towards a separation of the elements in turbulence via the analyses withing MPDFT

    Toshihico Arimitsu, Naoko Arimitsu, Kohei Takechi, Yukio Kaneda, Takashi Ishihara

    arXiv.org[cond-mat.sta-mech]   1111   2011

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  • 2D Direct Numerical Simulation of Intermediate Species Diffusion in Low Temperature Oxidation Process Reviewed

    Atsushi Teraji, Takahiro Morikawa, Takashi Ishihara, Yukio Kaneda

    ICDERS 2011 Proceedings   - ( - )   -   2011

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  • 25pTF-12 乱流の大規模直接数値計算データを用いた4次速度構造関数及び圧力勾配・速度構造関数の解析(25pTF 非圧縮性流体,領域11(統計力学,物性基礎論,応用数学,力学,流体物理))

    中西 崇仁, 石原 卓

    日本物理学会講演概要集   65 ( 2 )   289 - 289   2010.8

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  • Direct Numerical Simulation of High Reynolds Number Isotropic Turbulence : Universality in Small Scale Statistics(<Special Review>Current Status and Future Prospects of Large-Scale Numerical Simulations-Part2) Invited

    KANEDA Yukio, ISHIHARA Takashi, Yukio KANEDA, Takashi ISHIHARA, Graduate School of Engineering Nagoya University, Graduate School of Engineering Nagoya University

    Nagare   29 ( 2 )   73-78 - 78   2010.4

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    Other Link： https://projects.repo.nii.ac.jp/?action=repository_uri&item_id=376799

  • Vortical structures and conditional statistics near the turbulent/non-turbulent interface of a mixing layer

    Gotoh Takashi, Ishihara Takashi, Kaneda Yukio

    2010   127 - 127   2010

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    Vortical structures and conditional statistics near the turbulent/non-turbulent interface of a turbulent mixing layer are studied using the data obtained by direct numerical simulation. We determine the conditional statistics by averaging data at fixed distances relative to the interface and put our emphasis on the possible Reynolds number (Re) dependence of the conditional statistics. Our analysis suggests that the conditionally-averaged spanwise vorticity has a sharp peak near the interface, and also that the width of the peak is approximately 10η irrespective of Re, where η is the Kolmogorov length scale.

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  • Dynamics of hairpin vortex structures in direct numerical simulation of turbulent boundary layer

    Ishihara Takashi, Kato Masayuki, Kaneda Yukio

    2010   117 - 117   2010

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  • 0217 Direct Numerical Simulation of Turbulent Boundary Layer Using a Spectral Method

    ISHIHARA Takashi, KATO Masayuki, KANEDA Yukio

    Fluids engineering conference ...   2009   123 - 124   2009.11

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    Spectral direct numerical simulations (DNSs) of zero-pressure-gradient turbulent boundary layer along a flat plate are performed using a fringe method. In the DNSs a particular attention is paid to the possible effect of the fringe method on the statistics of turbulent boundary layer. Comparing the results obtained from DNSs of different parameters, we confirmed that there is a region for which similar Re-dependence of the statistics is obtained. DNS results show that Re-dependence of not only velocity statistics but also pressure statistics is quantitatively consistent with experimental results of much higher Re turbulent boundary layers.

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  • 28aQC-6 Computational analysis of vortical structures in high resolution DNS of turbulence

    Takahashi Kazuki, Ishihara Takashi

    Meeting abstracts of the Physical Society of Japan   64 ( 2 )   218 - 218   2009.8

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  • 乱流の大規模DNSデータ解析：速度差の統計の距離依存性とレイノルズ数依存性

    石原 卓

    九州大学応用力学研究所研究集会報告,   20ME-S6   176   2009.5

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  • Universality in Statistics at Small Scales of Turbulence: A Study by High Resolution DNS Reviewed

    Yukio Kaneda, Takashi Ishihara

    TURBULENCE AND INTERACTIONS   105   55 - 76   2009

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    DOI： 10.1007/978-3-642-00262-5_3

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  • Direct Numerical Simulation of Turbulent Boundary Layers Using a Fringe Method

    Kato Masayuki, Ishihara Takashi, Kaneda Yukio

    2009   27 - 27   2009

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    We perform spectral direct numerical simulations (DNSs) of zero-pressure-gradient turbulent boundary layer along a flat plate using a fringe method. In the DNSs a particular attention is paid to the possible effect of the fringe method on the statistics of turbulent boundary layer. Comparing the results obtained from DNSs of different parameters, we confirmed that there is a region for which similar Re-dependence of the statistics is obtained. Visualizations of turbulent boundary layer show that |ω|, |∇p| and |∂p/∂x| have similar structures. This suggest a possibility that structures in high Re turbulent boundary layer may be understood by analyzing experimental data of ∂p/∂x.

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  • Direct numerical simulation of turbulent channel flow at high Reynolds number Reviewed

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    Proceedings of International Symposium on Frontiers of Computational Science 2008   2008   165-172 - 159   2008.11

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    Taylor microscale Reynolds numbers R_λ and one-dimensional energy spectra of the velocity fluctuations in turbulent channel flows are analyzed by using direct numerical simulations with friction Reynolds numbers up to Re_Τ=1280. Special emphasis is put on the dependence of R_λ on the distance from the wall and Re_Τ.

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  • 表紙の図について「乱流の大規模シミュレーション結果の対話的可視化」

    石原 卓, ISHIHARA Takashi

    情報連携基盤センターニュース   7 ( 3 )   2008.8

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  • スーパーコンピュータを使おう(5)

    石原 卓

    名古屋大学情報連携基盤センター ニュース   7 ( 3 )   327-332   2008.8

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  • Multifractal analysis by using high-resolution direct numerical simulation of turbulence Reviewed

    Takashi Ishihara, Hirotaka Higuchi

    IUTAM SYMPOSIUM ON COMPUTATIONAL PHYSICS AND NEW PERSPECTIVES IN TURBULENCE   4   61 - 66   2008

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  • Attempts at computer-aided understanding of turbulence Reviewed

    Yukio Kaneda, Takashi Ishihara, Koji Morishita, Yoshinori Mizuno

    IUTAM SYMPOSIUM ON COMPUTATIONAL PHYSICS AND NEW PERSPECTIVES IN TURBULENCE   4   49 - 54   2008

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  • Analysis of Lagrangian acceleration by DNS of isotropic turbulence

    Takahashi Kazuki, Ishihara Takashi

    2008   169 - 169   2008

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    To study the properties of extreme events in Lagrangean acceleration we analyze Lagrangian data obtained from a direct numerical simulation of forced homogeneous isotropic turbulence which was performed on 1024^3 grid points with R 283. The extreme events are known to be trapping events by vortex filaments. Our analysis shows that the extreme Lagrangian accelerations are accompanied by spiral motions whose frequency is about 0.5Τ_η^1 and whose duration is less than about 10Τ_η, where Τ_η is the Kolmogorov time scale. It is found that the extreme events are strongly correlated with time variation of Lagrangian vorticities.

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  • Attempts at Computational Science of Turbulence Invited

    KANEDA Yukio, ISHIHARA Takashi

    nagare   26 ( 6 )   375-383 - 383   2007.12

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    A review is presented on attempts to understand turbulence by using high-performance computing. An emphasis is puton the study of turbulence by the direct numerical simulation (DNS) of incompressible turbulence in a periodic boxwith the number of grid points up to 40963. The DNS data shed some light on the basic questions on the statisticsof turbulence at high Reynolds number Re. The statistics include (i) the normalized mean rate of kinetic energydissipation in the limit Re→→, (ii) the energy spectrum in the universal equilibrium range, (iii) intermittency of thenergy dissipation rate, and (iv) energy transfer from large to small scales.

    DOI： 10.11426/nagare1982.26.375

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  • 22pTW-5 Multifractal analysis of turbulence by high resolution DNS

    Higuchi Hirotaka, Ishihara Takashi

    Meeting abstracts of the Physical Society of Japan   62 ( 2 )   296 - 296   2007.8

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  • Small-scale statistics in high-resolution direct numerical simulation of turbulence Reviewed

    Yukio Kaneda, Takashi Ishihara

    PROGRESS IN TURBULENCE II   109   11 - +   2007

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  • Statistical property of pressure fluctuation in fully developed turbulence Reviewed

    Yoshiyuki Tsuji, Takashi Ishihara

    IUTAM SYMPOSIUM ON ELEMENTARY VORTICES AND COHERENT STRUCTURES: SIGNIFICANCE IN TURBULENCE DYNAMICS   79   163 - +   2006

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  • High-resolution direct numerical simulation of turbulence Reviewed

    Y Kaneda, T Ishihara

    JOURNAL OF TURBULENCE   7 ( 20 )   1 - 17   2006

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    DOI： 10.1080/14685240500256099

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  • AM06-03-002 Multifractal Analysis by Using High-Resolution Direct Numerical Simulation of Turbulence

    Ishihara Takashi, Higuchi Hirotaka, Kaneda Yukio

    2006   34 - 34   2006

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    Multifractal analysis is performed by using the high-resolution DNS data of turbulence with the number of grid points up to 4096^3. The analysis shows that the so-called generalized dimensions of energy dissipation and enstrophy can be obtained as almost scale-independent expornents provided that the scale is in the inertial subrange. Reynolds number dependence of multifractal measures such as the so-called f(α) spectra is discussed.

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  • Statistics of energy transfer in high-resolution direct numerical simulation of turbulence in a periodic box Reviewed

    T Aoyama, T Ishihara, Y Kaneda, M Yokokawa, K Itakura, A Un

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 12 )   3202 - 3212   2005.12

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  • Box 乱流の大規模 DNS 結果から見た Channel 乱流

    石原 卓, 長田將明, 金田行雄

    京都大学数理解析研究所講究録   1434 ( 1434 )   188-194 - 194   2005.5

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  • 結合コンパクトスキームを用いたチャネル乱流の直接数値シミュレーション

    高林大作, 林 一樹, 石原 卓

    豊田研究報告   ( 58 )   155-160 - 160   2005.5

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  • Energy spectrum in the near dissipation range of high resolution direct numerical simulation of turbulence Reviewed

    T Ishihara, Y Kaneda, M Yokokawa, K Itakura, A Uno

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   74 ( 5 )   1464 - 1471   2005.5

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  • AM05-02-001 Data analysis based on the ultra DNS of turbulence : Energy flux and dissipation in the inertial subrange of turbulence

    Ishihara Takashi, Aoyama Tomohiro, Kaneda Yukio

    2005   53 - 53   2005

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    Energy flux in turbulence from scales larger than a filter size γ to small scales is given by T(x, t)=-Τ_<ij>S^^-_<ij>, where Τ_<ij> is the subgrid stress and S^^-_<ij> is the resolved strain-rate tensor. The statistics of T is studied by using the data of a series of high-resolution direct numerical simulations of incompressible turbulence in a periodic box with the number of grid points up to 4096^3. The data show that T is highly intermittent and the skewness S and flatness F of T increase with the wavenumber κ(∝1/γ) approximately as S ∝(κL)^<αS> F ∝(κL)^<αF> in the inertial subrange, where α_S and α_F are constants independent of R_λ, and L is the characteristic length scale of energy containing eddies. The relation between the statistics of T, the energy dissipation rate ε and its local average ε_γ over a domain of scale r is also studied; T is less intermittent than ε and there is a certain similarity in the probability distribution functions of T and ε_γ.

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  • Scalability of hybrid programming for a CFD code on the Earth Simulator

    K Itakura, A Uno, M Yokokawa, T Ishihara, Y Kaneda

    PARALLEL COMPUTING   30 ( 12 )   1329 - 1343   2004.12

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  • 13pTD-10 Examination of similarities in the inertial subrange of turbulence through high resolution DNS

    Aoyama T., Ishihara T., Kaneda Y

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   223 - 223   2004.8

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  • 13pTD-11 Examination of hypotheses in the Kolmogorov refined turbulence theory through high-resolution DNS

    Kutsuna Shuhei, Ishihara Takashi, Kaneda Yukio

    Meeting abstracts of the Physical Society of Japan   59 ( 2 )   223 - 223   2004.8

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  • Ultra Direct Numerical Simulation of Turbulence on the Earth Simulator - Data Analyses- Reviewed

    Takashi Ishihara, Yukio Kaneda

    Proc. Russia-Japan International Workshop on Turbulence and Instabilities, Moscow, Russia   2004

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  • Ultra direct numerical simulation of turbulence on the earth simulator Reviewed

    T Ishihara

    COMPUTATIONAL MECHANICS, PROCEEDINGS   369 - 374   2004

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  • High-resolution direct numerical simulation of turbulence - Spectra of fourth-order velocity momenrs Reviewed

    Y Kaneda, T Ishihara, M Yokokawa, K Itakura, A Uno

    IUTAM SYMPOSIUM ON REYNOLDS NUMBER SCALING IN TURBULENT FLOW   74   155 - 162   2004

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  • E231 Velocity derivative statistics in direct numerical simulations of turbulence in a periodic box

    ISHIHARA Takashi, KANEDA Yukio

    2004   392 - 393   2004

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    The data of high resolution direct numerical simulations (DNSs) of incompressible turbulence obeying the Navier-Stokes equations in a periodic box with the number of grid points up to 4096^3 were analyzed to study the one-point statistics of the velocity-derivatives, including probability distribution functions and the fourth-order rotational invariants I_α(α=1,2,3,4) proposed by Siggia (1981). The data suggest that the values of all four I_α(α=1,2,3,4) increase with the Reynolds number R_λ and the ratios I_α/I_l tend to constants with the increase of R_λ, and that they scale with R_λ similarly to each other for large R_λ.

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  • Similarity scaling of pressure fluctuation in turbulence Reviewed

    Y Tsuji, T Ishihara

    PHYSICAL REVIEW E   68 ( 2 )   2630968-1-5   2003.8

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  • Anisotropic spectrum of homogeneous turbulent shear flow in a Lagrangian renormalized approximation Reviewed

    K Yoshida, T Ishihara, Y Kaneda

    PHYSICS OF FLUIDS   15 ( 8 )   2385 - 2397   2003.8

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  • Spectra of energy dissipation, enstrophy and pressure by high-resolution direct numerical simulations of turbulence in a periodic box Reviewed

    T Ishihara, Y Kaneda, M Yokokawa, K Itakura, A Uno

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   72 ( 5 )   983 - 986   2003.5

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  • 大規模DNSによる乱流物理現象の解明

    金田行雄, 石原卓

    日本流体力学会数値流体力学部門Web会誌   11 ( 2 )   25-30   2003.5

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  • Energy dissipation rate and energy spectrum in high resolution direct numerical simulations of turbulence in a periodic box Reviewed

    Y Kaneda, T Ishihara, M Yokokawa, K Itakura, A Uno

    PHYSICS OF FLUIDS   15 ( 2 )   L21 - L24   2003.2

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  • Performance tuning of a CFD code on the earth simulator

    K Itakura, A Uno, M Yokokawa, M Saito, T Ishihara, Y Kaneda

    NEC RESEARCH & DEVELOPMENT   44 ( 1 )   115 - 120   2003.1

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  • Ultra Direct Numerical Simulation of Turbulence on the Earth Simulator Reviewed

    Takashi Ishihara

    Proc. Japan-Russia Seminar, TIT   2003

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  • Comparison of a spectral method with a higher-order finite difference method in direct numerical simulations of three-dimensional homogeneous turbulence Reviewed

    Katsunori Yoshimatsu, Takashi Ishihara, Yukio Kaneda, Satoshi Nakai, Hidetoshi Nishida, Nobuyuki Satafuka

    Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   69 ( 679 )   541 - 546   2003

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    DOI： 10.1299/kikaib.69.541

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  • LES modelings based on the Lagrangian renormalized approximation Reviewed

    K Yoshida, T Ishihara, D Fujita, T Yamahira, Y Kaneda

    STATISTICAL THEORIES AND COMPUTATIONAL APPROACHES TO TURBULENCE   203 - 218   2003

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  • Predictability of 3D isotropic turbulence - Effect of data assimilation Reviewed

    K Hayashi, T Ishihara, Y Kaneda

    STATISTICAL THEORIES AND COMPUTATIONAL APPROACHES TO TURBULENCE   239 - 247   2003

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  • High resolution DNS of incompressible homogeneous forced turbulence - Time dependence of the statistics Reviewed

    T Ishihara, Y Kaneda

    STATISTICAL THEORIES AND COMPUTATIONAL APPROACHES TO TURBULENCE   177 - 188   2003

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  • LES of Stably Stratified Turbulence Reviewed

    Kyo Yoshida, Takashi Ishihara, Yukio Kaneda

    Proc. International Workshop on Statistical Theories and Computational Approaches to Turbulence   219-228   2002.11

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  • Relative diffusion of a pair of fluid particles in the inertial subrange of turbulence Reviewed

    T Ishihara, Y Kaneda

    PHYSICS OF FLUIDS   14 ( 11 )   L69 - L72   2002.11

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  • Scalability Evaluation of Direct Numerical Simulation on Earth Simulator

    UNO ATSUYA, ITAKURA KEN'ICHI, YOKOKAWA MITSUO, ISHIHARA TAKASHI, KANEDA YUKIO

    IPSJ SIG Notes   91 ( 80 )   55 - 60   2002.8

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    There are two programming models on the shared-memory architecure. One, called the flat programming, is using MPI, and the other, called the hybrid programming, is using MPI and shared-memory models simultaneously. In general, it is difficult that the hybrid programming outperforms the flat programming. In this study, we evaluated a scalability of large-scale direct numerical simulations of the Navier-Stokes equations on the Earth Simulator. As a result, the hybrid programming could outpeform the flat programming on the Earth Simulator. Also, we discuss the tuning strategies to obtain higher performance on the Earth Simulator.

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  • Anisotropic velocity correlation spectrum at small scales in a homogeneous turbulent shear flow Reviewed

    T Ishihara, K Yoshida, Y Kaneda

    PHYSICAL REVIEW LETTERS   88 ( 15 )   154501 - 1545014   2002.4

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  • 25aXB-4 Anisotropic spectrum in homogeneous shear turbulent flow

    Ishihara T., Yoshida K., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   248 - 248   2002.3

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  • 25aXB-5 Simulation of 3D homogeneous turbulence:spectral method vs. higher order method of lines

    Yoshimatsu K, Ishihara T., Yamazaki Y., Kaneda Y., Nishida H., Nakai S., Satofuka N.

    Meeting abstracts of the Physical Society of Japan   57 ( 1 )   248 - 248   2002.3

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  • Effects of wavenumber truncation on high-resolution direct numerical simulation of turbulence Reviewed

    Y Yamazaki, T Ishihara, Y Kaneda

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   71 ( 3 )   777 - 781   2002.3

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  • 地球シミュレータによる乱流のUltra Simulation

    金田行雄, 石原 卓, 横川三津夫, 板倉憲一, 宇野篤也

    九大応力研研究集会報告 14ME-S1   90-97   2002

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  • 乱流の謎にせまる計算科学

    後藤俊幸, 石原卓

    パリティ   17 ( 10 )   27-33 - 33   2002

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  • 16.4TFlops direct numerical simulation of turbulence by a Fourier spectral method on the Earth Simulator Reviewed

    Mitsuo Yokokawa, Ken'ichi Itakura, Atsuya Uno, Takashi Ishihara, Yukio Kaneda

    Proc. IEEE/ACM SC2002 Conf.   2002-November   -   2002

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  • 乱流のUltra Simulation

    金田行雄, 石原 卓, 横川三津夫, 板倉憲一, 宇野篤也

    第６回シミュレーション・サイエンス・シンポジウム及び核融合科学研究所共同研究「大型シミュレーション研究」合同研究会集録NIFS-PROC-52   24-27   2002

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  • 地球シミュレータ上の一様等方性乱流シミュレーション

    横川三津夫, 斎藤 実, 石原 卓, 金田行雄

    ハイパフォーマンスコンピューティングと計算科学シンポジウムHPCS2002   125-131   2002

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  • Anisotropic spectrum in turbulence and its Reynolds-number denpendency

    YOSHIDA Kyo, ISHIHARA Takashi, KANEDA Yukio

    2002   388 - 389   2002

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    It was shown by the authors [Phys. Rev. Lett. 88,154501 (2002)] that a perturbational analysis and direct numerical simulations on 512^3 grid points suggest a simple form of the velocity correlation spectrum tensor in the inertial subrange of homogeneous turbulent shear flow at high Reynolds number. It is an anisotropic function of the wavevector and determined by the rate of strain tensor of the mean flow, the energy dissipation per unit mass, and two non-dimensional constants. In this paper, and analysis to estimate the constants based on the Lagrangian renormalized approximation is presented. A preliminary analysis suggests that the anisotropic velocity correlation tensor at a wavenumber is sensitive to its ratio to the lower-end wavenumber of the inertial range.

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  • Pledictability of three-dimensional isotropic turbulence-Effect of data assimilation

    Hayashi K., Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   206 - 206   2001.9

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  • Theoretical and numerical study on relative diffusion of particle pairs in isotropic turbulece

    Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   56 ( 2 )   206 - 206   2001.9

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  • Frequency shifts of Rossby waves in the inertial subranges of beta-plane turbulence Reviewed

    T Ishihara, Y Kaneda

    PHYSICS OF FLUIDS   13 ( 8 )   2338 - 2349   2001.8

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  • 乱流の慣性小領域におけるラグランジュ統計

    石原卓, 金田行雄

    京都大学数理解析研究所講究録   1226 ( 1226 )   86-93 - 93   2001.7

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  • Nonuniversal k(-3) energy spectrum in stationary two-dimensional homogeneous turbulence Reviewed

    Y Kaneda, T Ishihara

    PHYSICS OF FLUIDS   13 ( 5 )   1431 - 1439   2001.5

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  • Predictability in 2-D turbulence and evaluation of LES models

    YAMAHIRA T., YOSHIDA K., ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   294 - 294   2001.3

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  • Evaluation of predictability in three-dimensional isotropic turbulence

    Fujita D., Yoshida K., Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   56 ( 1 )   294 - 294   2001.3

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  • Energy spectrum in the enstrophy transfer range of two-dimensional forced turbulence Reviewed

    T Ishihara, Y Kaneda

    PHYSICS OF FLUIDS   13 ( 2 )   544 - 547   2001.2

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  • Statistics of small-scale structure of homogeneous isotropic turbulence Reviewed

    T Ishihara, Y Yamazaki, Y Kaneda

    IUTAM SYMPOSIUM ON GEOMETRY AND STATISTICS OF TURBULENCE   59   133 - 138   2001

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  • 乱流の大規模DNSデータ可視化ツールの開発

    石原 卓

    第4回「シミュレーション・サイエンス・シンポジウム」及び核融合科学研究所共同研究「大型シミュレーション研究」合同研究会集録   61-65   2001

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  • 大規模乱流DNSデータの可視化

    大野哲也, 森建策, 末永康仁, 石原 卓, 石井克哉, 金田行雄

    九州大学応用力学研究所研究集会報告   11ME-S3   2000.12

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  • Effect of high wave-number truncation on inertial-range statistics of turbulence.

    Yamazaki Y., Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   223 - 223   2000.9

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  • LES models derived by two-point closures for stratified turbulens

    Fujimura N., Ishihara T., Kanea Y.

    Meeting abstracts of the Physical Society of Japan   55 ( 2 )   231 - 231   2000.9

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  • a posteriori test of LES models derived by two-point closures for anisotropic turbulens

    Fujimura N., Yamazaki Y., Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   250 - 250   2000.3

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  • Similarity of triad interactions in the incrtial range of a forced turbulence

    Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   55 ( 1 )   252 - 252   2000.3

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  • 25aV-10 A posteriori test of LES models derived by two-point closures

    ISHIKAWA K, ISHIHARA T, KANEDA Y

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   220 - 220   1999.9

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  • 25aV-9 A posteriori test of the two-dimensional LES model by Leith

    OKAWA S, ISHIHARA T, KANEDA Y

    Meeting abstracts of the Physical Society of Japan   54 ( 2 )   219 - 219   1999.9

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  • Taylor expansions in powers of time of Lagrangian and Eulerian two-point two-time velocity correlations in turbulence Reviewed

    Y Kaneda, T Ishihara, K Gotoh

    PHYSICS OF FLUIDS   11 ( 8 )   2154 - 2166   1999.8

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  • 29p-P-12 A priori tests of LES models using high resolution DNS database

    Ishihara T., Ishikawa K., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   54 ( 1 )   772 - 772   1999.3

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  • Statistics of small-scale structure of homogeneous isotropic turbulence

    10ME-S4   131   1999

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  • 乱流の大規模数値シミュレーション

    石原 卓

    名古屋大学大型計算機センターニュース   30 ( 4 )   ?   1999

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  • 乱流の大規模数値実験

    石原 卓

    九大応力研研究集会「流体方程式の解と縮約解析」   ?   1999

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  • Numerical Studies of Large Scale Turbulent Flows in Two and Three Dimensions Reviewed

    Kamen N. Beronov, Takashi Ishihara, Yukio Kaneda

    Proceedings of Oxford Kobe Seminars: The Second Scientific Meeting on Systems Engineering and Applied Mathematics   145-151   1998.12

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  • Pade Approximation of Two-point Two-time Lagrangian Correlation in Turbulence

    GOTOH K., ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 2 )   910 - 910   1998.9

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  • Taylor expansion in powers of time of Lagrangian velocity field in Taylor-Green flow

    ISHIHARA Takashi, GOTOH Koji, KANEDA Yukio

    17   389 - 390   1998.7

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  • Fine-scale structure of thin vortical layers Reviewed

    T Ishihara, Y Kaneda

    JOURNAL OF FLUID MECHANICS   364   297 - 318   1998.6

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  • Taylor expansions and pade approximations of Lagrangian and Eulerian two-time velocity correlations in turbulence Reviewed

    Y Kaneda, K Gotoh, T Ishihara

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   67 ( 4 )   1075 - 1078   1998.4

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  • Eulerian and Lagrangian statistics in rotating tubuleuce

    YAMAZAKI Y., ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   781 - 781   1998.3

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  • Analysis of stably stratified uniform shear flow turbuleure

    NARUSE T., ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   781 - 781   1998.3

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  • Frequency shifts of Roseby waves in the inertial subranges of beta-plaue turbnleure

    ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   781 - 781   1998.3

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  • Direct Numerical Simulation of a double-diffusive turbulence

    ANDO T., ISHIHARA T., KANEDA Y.

    Meeting abstracts of the Physical Society of Japan   53 ( 1 )   782 - 782   1998.3

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  • 6p-YB-4 Numerical simulation of a rotating turbulence

    Yamazaki Y., Ishihara T., Kaneda Y.

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   896 - 896   1997.9

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  • 6a-YB-8 Statistics and diffusion in simple-shear turbulence

    Tatsumi Nobuyoshi, Naruse Takahiro, Ishihara Takashi, Kaneda Yukio

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   893 - 893   1997.9

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  • 6p-YB-9 Taylor expansion of the turbulent velocity field in powers of time

    Gotoh Koji, Ishihara Takashi, Kaneda Yukio

    Meeting abstracts of the Physical Society of Japan   52 ( 2 )   897 - 897   1997.9

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  • Singularity Formation in Motion of a Vortex Sheet ─Numerical Simulation

    ISHIHARA Takashi

    16   27 - 28   1997.7

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  • Singularity Formation in the Shape of a Vortex Sheet in Three Dimensions - Numerical Simulation Reviewed

    Takashi Ishihara, Yukio Kaneda

    ESAIM:Proceedings   1   463-479   1996

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  • Analytic Structure of a vortical layer in uniform strain field

    974   248-259 - 259   1996

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  • Fine scale structure of thin vortex layers

    Takashi Ishihara, Yukio Kaneda

    Proc. ICTAM   -   -   1996

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  • SINGULARITY FORMATION IN 3-DIMENSIONAL MOTION OF A VORTEX SHEET Reviewed

    T ISHIHARA, Y KANEDA

    JOURNAL OF FLUID MECHANICS   300   339 - 366   1995.10

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  • 30a-E-9 An exact solution of Navier-Stokes equation and its small-scale structure

    Ishihara T, Kaneda Y.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1995 ( 4 )   113 - 113   1995.9

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  • 4a-A-4 Spontaneous Singularity Formation in the Shape of Vortex Sheet in Three-Dimensional Flow

    Ishihara T, Kaneda Y

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1994 ( 4 )   86 - 86   1994.8

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  • 30p-Z-4 Numerical Simulation of Three-Dimensional Roll-up of a Vortex Sheet

    Ishihara T, Kaneda Y

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting   49 ( 4 )   103 - 103   1994.3

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  • SPONTANEOUS SINGULARITY FORMATION IN THE SHAPE OF VORTEX SHEET IN 3-DIMENSIONAL FLOW Reviewed

    T ISHIHARA, Y KANEDA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   63 ( 2 )   388 - 392   1994.2

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  • ３次元的渦面の運動の解析と数値シミュレーション

    石原 卓, 金田行雄

    京大数理研講究録   866   149-160   1994

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  • Spontaneous Singularity Formation in the Shape of Vortex Sheet in Three-Dimensional Flow : Analysis and Numerical Simulation(Mathematical Fluid Mechanics and Modeling)

    RIMS Kokyuroku   888   64-72 - 72   1994

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  • 13a-ZA-3 The spontaneous breakdown of analyticity in the three dimensional motion of a vortex sheet

    Ishihara T., Kaneda Y.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting   1993 ( 4 )   83 - 83   1993.9

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  • TIME MICRO-SCALES OF LAGRANGIAN STRAIN TENSOR IN TURBULENCE Reviewed

    T ISHIHARA, Y KANEDA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   62 ( 2 )   506 - 513   1993.2

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  • STRETCHING AND DISTORTION OF MATERIAL LINE ELEMENTS IN 2-DIMENSIONAL TURBULENCE Reviewed

    T ISHIHARA, Y KANEDA

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   61 ( 10 )   3547 - 3558   1992.10

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  • 乱流中のラグランジュ的およびオイラー的自己速度相関 (統計数理研究所 研究活動 (研究会報告 乱流の統計理論とその応用))

    金田 行雄, 石原 卓

    統計数理 = Proceedings of the Institute of Statistical Mathematics   40 ( 1 )   55 - 55   1992.6

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  • 28a-ZD-6 乱流中の流体要素の変形の統計理論

    石原 卓, 金田 行雄

    年会講演予稿集   47 ( 4 )   88 - 88   1992.3

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  • Time micro scales of Lagrangian Strain Tensor in Turbulence

    800   147-156 - 156   1992

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  • 26a-L-1 LINE STRETCHING IN 2-D ISOTROPIC TURBULENCE

    Ishihara T

    1991 ( 4 )   76 - 76   1991.3

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Presentations

  • MSM解析値を用いて評価した乱流エネルギー散逸率の3次元的分布と線状降水帯の関係について

    山本 和寿, 石原 卓

    日本流体力学会 年会2025  2025.9.19 

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    Event date： 2025.9.17 - 2025.9.19

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  • 乱流の大規模直接数値シミュレーションにおけるエネルギー散逸率及びエンストロフィーの統計

    金田 行雄, 岡本 直也, 石原 卓, 横川 三津夫

    日本流体力学会 年会2025  2025.9.18 

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    Event date： 2025.9.17 - 2025.9.19

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  • 乱流DNSに基づく粗視化変形とエネルギー散逸率の相関評価

    新田 歩武, 石原 卓

    日本流体力学会 年会2025  2025.9.18 

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    Event date： 2025.9.17 - 2025.9.19

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  • 等温圧縮性乱流と非等温圧縮性乱流におけるエネルギー散逸構造の可視化と数値解析

    立石 隼啓, 金尾 祐伸, 石原 卓, 櫻井 幹記

    第38回数値流体力学シンポジウム  2024.12.12 

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    Event date： 2024.12.11 - 2024.12.13

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  • 高レイノルズ数乱流のデータ駆動科学プラットフォームの構築

    石原 卓, 畑中 裕翔, 横川 三津夫, 大島 聡史

    第38回数値流体力学シンポジウム  2024.12.12 

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    Event date： 2024.12.11 - 2024.12.13

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  • 2次元非圧縮乱流における4次元変分法データ同化の数値実験

    芦田 直之, 石原 卓

    第38回数値流体力学シンポジウム  2024.12.12 

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    Event date： 2024.12.11 - 2024.12.13

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  • 圧縮性等温乱流の大規模直接数値計算-スペクトルのレイノルズ数依存性-

    櫻井 幹記, 石原 卓, 横川 三津夫

    第38回数値流体力学シンポジウム  2024.12.11 

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    Event date： 2024.12.11 - 2024.12.13

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  • hp230143 高レイノルズ数乱流の大規模直接数値シミュレーション

    石原 卓

    第11回「富岳」を中核とするHPCIシステム利用研究課題 成果報告会  2024.10.25 

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    Event date： 2024.10.24 - 2024.10.25

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  • 風向・風速データの位相データ解析による局地的大雨の予兆検出

    嶋林 陸, 石原 卓

    日本流体力学会 年会2024  2024.9.27 

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    Event date： 2024.9.25 - 2024.9.27

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  • MSM解析値を用いた乱流エネルギー散逸率と降雨の関係についての数値解析

    山本 和寿, 石原 卓

    日本流体力学会 年会2024  2024.9.27 

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  • 擬スペクトル法による数値計算における丸め誤差の影響の解析

    石原 卓, 吾郷 凌太朗, 岡本 直也, 横川 三津夫, 金田 行雄

    日本流体力学会 年会2024  2024.9.27 

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  • 振動する後縁を持つ2次元翼周りの流れの数値シミュレーション

    近藤 綾, 石原 卓

    日本流体力学会 年会2024  2024.9.25 

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    Event date： 2024.9.25 - 2024.9.27

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  • Large-scale, double-precision direct numerical simulations of incompressible turbulence on Fugaku

    Takashi Ishihara, Naoya Okamoto, Yukio Kaneda, Mitsuo Yokokawa, Yuki Yamane

    1st European Fluid Dynamics Conference  2024.9.18 

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    Event date： 2024.9.16 - 2024.9.20

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  • Turbulence statistics in high-resolution direct numerical simulations of compressible isothermal turbulence

    Yoshiki Sakurai, Takashi Ishihara, Ryo Takegami, Taiki Matsumoto, Mitsuo Yokokawa

    1st European Fluid Dynamics Conference  2024.9.18 

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    Event date： 2024.9.16 - 2024.9.20

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  • Assessment of the stretched exponential functions describing extreme dissipation and enstrophy

    Gerrit Elsinga, Takashi Ishihara

    1st European Fluid Dynamics Conference  2024.9.16 

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    Event date： 2024.9.16 - 2024.9.20

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  • jh240062 高レイノルズ数乱流のデータ駆動科学プラットフォームの構築

    石原 卓

    第16回JHPCN拠点シンポジウム  2024.7.11 

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    Event date： 2024.7.11 - 2024.7.12

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  • Dust growth simulation using direct numerical simulation of turbulence

    JpGU 2024  2024.5.29 

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    Event date： 2024.5.26 - 2024.5.31

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  • Domain dependence of relative diffusion of fluid and inertial particles in high Reynolds number turbulence

    Takashi Ishihara

    Current Advances in Turbulence and multiphase flowS - 24CATS, OIST Seaside House  2024.4.18 

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    Event date： 2024.4.16 - 2024.4.19

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  • 圧縮性乱流直接数値シミュレーションのスカラプロセッサ用コードの開発と性能評価

    竹上諒, 松本泰生, 横川三津夫, 櫻井幹記, 石原卓

    第193回ハイパフォーマンスコンピューティング研究発表会  2024.3.18 

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  • 高速フーリエ変換ルーチンの3軸並列実装と性能評価および圧縮性乱流DNSコードへの適用

    坂野智紀, 横川三津夫, 今村俊幸, 竹上諒, 松本泰生, 櫻井幹記, 石原卓

    第193回ハイパフォーマンスコンピューティング研究発表会  2024.3.18 

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    Event date： 2024.3.18 - 2024.3.19

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  • Large-scale direct numerical simulations of high Reynolds number turbulence Invited

    Takashi Ishihara

    Satellite Workshop on High Reynolds Number Turbulence, Nagoya Institute of Technology  2024.3.16 

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    Event date： 2024.3.16

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  • DNS studies on the processes of particle growth in high Reynolds number turbulence Invited

    Takashi Ishihara

    5th International Workshop on Cloud Turbulence, Nagoya Institute of Technology  2024.3.15 

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    Event date： 2024.3.14 - 2024.3.15

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  • 降雨予測のための風向・風速の位相的データ解析

    石原 卓, 嶋林 陸

    第4回「データ記述科学」領域会議  2024.1.18 

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    Event date： 2024.1.18 - 2024.1.19

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  • 原始惑星系円盤の乱流中でのダスト成長

    石原卓

    「成果創出加速」基礎科学合同シンポジウム, 筑波大学・東京キャンパス  2023.12.20 

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    Event date： 2023.12.18 - 2023.12.20

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  • 乱流の慣性小領域における相対粒子拡散のLagrange的速度相関

    徳増 晃平, 浦 覚斗, 石原 卓, 金田 行雄

    第37回数値流体力学シンポジウム, 名古屋大学 東山キャンパス IB電子情報館  2023.12.17 

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    Event date： 2023.12.15 - 2023.12.17

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  • 4次元変分法を用いたデータ同化の数値実験

    芦田直之, 石原 卓

    第32回 日本流体力学会 中四国・九州支部講演会, 岡山大学工学部環境理工棟  2023.11.26 

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    Event date： 2023.11.25 - 2023.11.26

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  • 降雨短期予測のための風向・風速の位相的データ解析

    石原 卓, 嶋林 陸

    第32回 日本流体力学会 中四国・九州支部講演会, 岡山大学工学部環境理工棟  2023.11.26 

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    Event date： 2023.11.25 - 2023.11.26

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  • Effects of arithmetic precision in large-scale direct numerical simulation of incompressible turbulence in a periodic box

    Takashi Ishihara, Naoya Okamoto, Mitsuo Yokokawa, Yukio Kaneda

    76th Annual Meeting of the Division of Fluid Dynamics, Washington, DC  2023.11.20 

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    Event date： 2023.11.19 - 2023.11.21

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  • 風向・風速の位相的データ解析 を活用した降水予測

    嶋林陸, 石原卓

    日本気象学会2023年度秋季大会, 仙台国際センター  2023.10.26 

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    Event date： 2023.10.23 - 2023.10.26

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  • 複雑流動場における極端現象の新しい予測・診断技術創出の ためのデータ記述科学の開拓

    石原 卓

    第3回「データ記述科学」領域会議  2023.9.25 

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    Event date： 2023.9.25 - 2023.9.26

    Language：Japanese   Presentation type：Poster presentation  

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  • 原始惑星系円盤乱流におけるダスト成長のシミュレーション

    石原卓, 河原昌平, 梅村雅之

    日本流体力学会 年会2023, 東京農工大学小金井キャンパス  2023.9.21 

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    Event date： 2023.9.20 - 2023.9.22

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 3次元非圧縮一様等方性乱流大規模DNSにおける丸め誤差の影響

    岡本直也, 石原卓, 横川三津夫, 金田行雄

    日本流体力学会 年会2023, 東京農工大学小金井キャンパス  2023.9.21 

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    Event date： 2023.9.20 - 2023.9.22

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 降水予測のための風向・風速の位相的データ解析

    嶋林陸, 石原卓

    日本流体力学会 年会2023, 東京農工大学小金井キャンパス  2023.9.20 

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    Event date： 2023.9.20 - 2023.9.22

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • DNS data analysis of the velocity-gradient tensor in high Reynolds number isotropic turbulence

    Takashi Ishihara, Masashi Miyamoto, Yukio Kaneda

    18th European Turbulence Conference, Valencia, Spain  2023.9.6 

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    Event date： 2023.9.4 - 2023.9.6

    Language：English   Presentation type：Oral presentation (general)  

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  • Large-Scale Direct Numerical Simulations of Canonical Turbulence Invited

    Takashi Ishihara

    CCP2023 - 34th IUPAP Conference on Computational Physics, Kobe International Conference Center, Kobe  2023.8.7 

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    Event date： 2023.8.4 - 2023.8.8

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • Vortical structures in high Reynolds number turbulence - clues from DNS results Invited

    Takashi Ishihara, Hiroki Morinaka, Masaru Inatsu

    ERCOFTAC Symposium “Multiphysics critical flow dynamics involving moving/deformable structures with design applications,” Toulouse, France  2023.6.9 

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    Event date： 2023.6.7 - 2023.6.9

    Language：English   Presentation type：Oral presentation (keynote)  

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  • 高レイノルズ数乱流中の渦構造について — 直接数値シミュレーションの結果 Invited

    石原 卓

    OCAMI共同利用研究集会「渦と磁場を焦点とする時空のトポロジーと幾何」, JR博多シティ  2022.12.17 

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    Event date： 2022.12.15 - 2022.12.17

    Language：Japanese   Presentation type：Oral presentation (invited, special)  

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  • 高レイノルズ数乱流中の慣性粒子の位相的データ解析

    岡 省吾, 石原 卓

    第30回 日本流体力学会 中四国・九州支部講演会, 高知大学朝倉キャンパス理工学部1号館101室  2022.11.26 

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    Event date： 2022.11.26

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 高レイノルズ数乱流中の慣性粒子の集中と拡散

    徳増晃平, 浦 覚斗, 石原 卓

    第30回 日本流体力学会 中四国・九州支部講演会, 高知大学朝倉キャンパス理工学部1号館101室  2022.11.26 

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    Event date： 2022.11.26

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 非圧縮一様等方性乱流DNSデータを 用いた超解像再構成におけるレイノルズ数依存性

    鈴木 綾介, 横川 三津夫, 石原 卓

    日本流体力学会 年会2022  2022.9.28  日本流体力学会

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学 吉田キャンパス   Country：Japan  

  • 一様等方性圧縮等温乱流の直接数値シミュレーション

    元塚 博貴, 櫻井 幹記, 石原 卓

    日本流体力学会 年会2022  2022.9.28  日本流体力学会

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学 吉田キャンパス   Country：Japan  

  • 乱流中の速度勾配テンソルのレイノルズ数依存性についてのDNSデータ解析

    宮本 理史, 石原 卓

    日本流体力学会 年会2022  2022.9.28  日本流体力学会

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学 吉田キャンパス   Country：Japan  

  • 高レイノルズ数乱流中の2粒子拡散 のLagrange速度相関のデータ解析

    浦 覚斗, 石原 卓

    日本流体力学会 年会2022  2022.9.28  日本流体力学会

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：京都大学 吉田キャンパス   Country：Japan  

  • 高レイノルズ数乱流中の2粒子拡散 のLagrange速度相関のデータ解析

    浦 覚斗, 石原 卓

    日本流体力学会 年会2022, 京都大学 吉田キャンパス  2022.9.28 

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 乱流中の速度勾配テンソルのレイノルズ数依存性についてのDNSデータ解析

    宮本 理史, 石原 卓

    日本流体力学会 年会2022, 京都大学 吉田キャンパス  2022.9.28 

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 非圧縮一様等方性乱流DNSデータを 用いた超解像再構成におけるレイノルズ数依存性

    鈴木 綾介, 横川 三津夫, 石原 卓

    日本流体力学会 年会2022, 京都大学 吉田キャンパス  2022.9.28 

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 一様等方性圧縮等温乱流の直接数値シミュレーション

    元塚 博貴, 櫻井 幹記, 石原 卓

    日本流体力学会 年会2022, 京都大学 吉田キャンパス  2022.9.28 

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    Event date： 2022.9.27 - 2022.9.29

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • 原始惑星系円盤における乱流とダスト成長 International coauthorship

    河原昌平, 梅村雅之, 石原卓

    日本天文学会2022年秋季年会  2022.9.15  日本天文学会

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    Event date： 2022.9.13 - 2022.9.15

    Language：Japanese   Presentation type：Poster presentation  

    Venue：新潟大学（ハイブリッド）   Country：Japan  

  • 原始惑星系円盤における乱流とダスト成長

    河原昌平, 梅村雅之, 石原卓

    日本天文学会2022年秋季年会  2022.9.13 

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    Event date： 2022.9.13 - 2022.9.15

    Language：Japanese   Presentation type：Poster presentation  

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  • 高レイノルズ数乱流中の慣性粒子の運動の数値シミュレーション

    石原卓

    第29回 日本流体力学会 中四国・九州支部講演会, 福岡大学 中央図書館1F 多目的ホール  2022.5.28 

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    Event date： 2022.5.28

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  • On the role of high Reynolds number turbulence in the dust coagulation process in a protoplanetary disk

    2022.5.23 

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    Event date： 2022.5.22 - 2022.5.27

    Language：Japanese   Presentation type：Oral presentation (general)  

    Country：Japan  

  • On the role of high Reynolds number turbulence in the dust coagulation process in a protoplanetary disk

    石原卓, 森中宏樹

    日本地球惑星科学連合 日本地球惑星科学連合2022年大会, 幕張メッセ  2022.5.23 

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    Event date： 2022.5.22 - 2022.5.27

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • DNS data analysis of the collision processes of inertial particles in high Reynolds number turbulence Invited International conference

    Takashi Ishihara

    4th International Workshop on Cloud Turbulence  2022.3.10  Toshiyuki Gotoh, Takeshi Watanabe, Takashi Naitoh, Izumi Saito

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    Event date： 2022.3.9 - 2022.3.11

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Nagoya Institute of Technology (Online)   Country：Japan  

  • DNS data analysis of the collision processes of inertial particles in high Reynolds number turbulence Invited

    Takashi Ishihara

    4th International Workshop on Cloud Turbulence, Online  2022.3.10 

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    Event date： 2022.3.9 - 2022.3.11

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • 一様等方性圧縮性乱流の直接数値シミュレーション

    櫻井 幹記, 石原 卓, 横川 三津夫

    第35回数値流体力学シンポジウム, オンライン（共催：東北大学流体科学研究所）  2021.12.16 

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    Event date： 2021.12.14 - 2021.12.16

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  • 乱流中で鉛直重力の働く慣性粒子の衝突過程のDNSデータ解析

    浅井 瑞貴, 櫻井 幹記, 石原 卓

    第35回数値流体力学シンポジウム, オンライン（共催：東北大学流体科学研究所）  2021.12.16 

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    Event date： 2021.12.14 - 2021.12.16

    Language：Japanese   Presentation type：Oral presentation (general)  

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  • Temporal Behavior of Significant Shear Layers in High Reynolds Number Turbulence

    Takashi Ishihara

    Eighteenth International Conference on Flow Dynamics, Online  2021.10.28 

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    Event date： 2021.10.27 - 2021.10.29

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  • 乱流の大規模数値シミュレーション Invited

    石原 卓

    山梨大学大学院医工農総合教育部，修士課程（工学専攻）特別講義  2021.9.27 

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    Event date： 2021.9.27 - 2021.9.28

    Language：Japanese   Presentation type：Public lecture, seminar, tutorial, course, or other speech  

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  • Significant thin shear layers in high Reynolds number turbulence Invited

    Takashi Ishihara, Gerrit E. Elsinga, Julian C. R. Hunt

    COLLOQUIUM 620 EXTREME DISSIPATION AND INTERMITTENCY IN TURBULENCE, Online  2021.5.18 

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    Event date： 2021.5.17 - 2021.5.19

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • 一様等方性圧縮等温乱流の高解像度直接数値シミュレーション

    櫻井 幹記, 石原 卓, 竹上 諒, 松本 泰生, 横川 三津夫

    第37回数値流体力学シンポジウム, 名古屋大学 東山キャンパス IB電子情報館  2023.12.17 

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    Event date： 2020.12.15 - 2023.12.17

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  • 粗視化した乱流場の渦度とエネルギー散逸率の統計のレイノルズ数依存性についての大規模DNSデータ解析

    石原 卓, 横川 三津夫

    日本流体力学会 年会2025  2025.9.17 

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  • Computational science of turbulence - Universality, intermittency, and connection to real turbulence phenomena Invited

    Takashi Ishihara

    Seminar at OIST  2024.2.22 

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  • 高レイノルズ数乱流の大規模直接数値シミュレーション

    石原 卓, 横川 三津夫, 宇野 篤也, 今村 俊幸, 金田 行雄

    第36回数値流体力学シンポジウム, オンライン（共催：慶應義塾大学 理工学部）  2022.12.16 

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  • 乱流の慣性小領域の渦構造についてのDNSデータ解析

    宮本 理史, 石原 卓, 金田 行雄

    日本流体力学会 年会2021, オンライン  2021.9.22 

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  • 高レイノルズ数乱流中の慣性粒子の運動の直接数値シミュレーション

    森中 宏樹, 石原 卓

    日本流体力学会 年会2021, オンライン  2021.9.22 

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  • 高レイノルズ数乱流中の流体粒子と慣性粒子の拡散過程のDNSデータ解析

    浦覚斗, 石原 卓

    日本流体力学会 年会2021, オンライン  2021.9.21 

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  • 乱流中の微細渦構造周りの慣性粒子の運動の数値解析

    元塚 博貴, 石原 卓

    日本流体力学会 年会2021, オンライン  2021.9.21 

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  • 乱流中の慣性粒子の分布の位相的データ解析

    岡 省吾, 石原 卓

    日本応用数理学会 2021年度年会, オンライン  2021.9.9 

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  • 宇宙物理における乱流現象解明のための計算科学 ー原始惑星系円盤乱流中のダスト成長ー Invited

    石原 卓

    GFD オンラインセミナー (第 6 回)  2021.7.12 

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  • On the role of turbulence in the dust coagulation process in a protoplanetary disk

    Takashi Ishihara, Hiroki Shiraishi, Hiroki Morinaka, Hiroki Mototsuka, Yoshiki Sakurai

    日本地球惑星科学連合2021年大会, オンライン  2021.6.4 

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  • 原始惑星系円盤の高レイノルズ数 乱流中でのダスト成長

    石原 卓, 森中宏樹, 奥住 聡, 梅村雅之

    日本天文学会2021年春季年会, オンライン  2021.3.16 

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  • 乱流中の慣性粒子の衝突過程に対する重力の影響のDNSデータ解析

    浅井 瑞貴, 石原 卓

    第34回数値流体力学シンポジウム, オンライン  2020.12.21 

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  • テイラー長に基づくレイノルズ数2250までの乱流DNSにおける2次の速度構造関数

    石原 卓, 金田 行雄, 森下 浩二, 横川 三津夫, 宇野 篤也

    第34回数値流体力学シンポジウム, オンライン  2020.12.21 

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  • 乱流中の多重スケール流れ構造と粒子衝突統計の関係についての数値解析

    櫻井 幹記, 石原 卓

    日本流体力学会 年会2020, オンライン  2020.9.20 

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  • 乱流中の慣性粒子の衝突・付着現象理解のための数値解析2

    白石 啓貴, 櫻井 幹記, 石原 卓

    日本流体力学会 年会2020, オンライン  2020.9.19 

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  • 台風に伴う気象現象と流れ構造の関係のデータ解析

    森中 宏樹, 石原 卓, 稲津 將

    日本流体力学会 年会2020, オンライン  2020.9.18 

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  • Multi-scale turbulent flow structures and particle collision statistics on planetesimal formation

    JpGU-AGU Joint Meeting 2020  2020.5.20 

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  • nヘプタン予混合気の自己着火過程における乱流と反応の相互作用

    久野 僚介, 石原 卓

    第33回数値流体力学シンポジウム, 北海道大学  2019.11.28 

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  • 乱流中の慣性粒子の衝突・付着現象理解のための数値解析

    白石啓貴, 櫻井幹記, 石原 卓

    第33回数値流体力学シンポジウム, 北海道大学  2019.11.28 

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  • 乱流現象の計算･数理科学 Invited

    石原 卓

    大阪大学MMDSワークショップ 工学と数学の接点を求めて  2019.11.14 

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  • Collision Statistics of Dust Particles in Compressible Turbulence International conference

    Y. Sakurai, T. Ishihara, H. Furuya, M. Umemura, K. Shiraishi

    16th International Conference on Flow Dynamics  2019.11.6 

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  • Drastic Changes of Turbulence in the Ignition Process of an n-Heptane Air Mixture International conference

    Takashi Ishihara, Ryousuke Kuno

    The 5th Symposium on Fluid-Structure-Sound Interactions and Control  2019.8.29 

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  • Effect of the compressibility of turbulent flows on dust particle collision statistics in a protoplanetary disk

    Yoshiki Sakurai, Hitomi Furuya, Naoki Kobayashi, Takashi Ishihara, Naoya Okamoto, Kenji Shiraishi, Masayuki Umemura

    JpGU2019  2019.5.28 

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  • Numerical simulations on the collision, adhesion, and growth of dust particles in turbulent gas in a protoplanetary disk

    Takashi Ishihara, Kohei Hamabata, Yoshiki Sakurai, Masayuki Umemura

    JpGU 2019  2019.5.28 

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  • Thin shear layers in high resolution Direct Numerical Simulations of turbulence International conference

    T. Ishihara, K. Morishita, J.C.R. Hunt

    IUTAM Symposium “Critical flow dynamics around moving/deformable structures with design applications”  2018.6.22 

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  • 乱流の計算科学

    石原 卓

    第23回計算工学講演会  2018.6.7 

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  • 乱流中の微細スケールにおける流体運動と慣性粒子クラスタリングの関係

    櫻井幹記, 石原 卓

    流体力学会中四国九州支部講演会  2018.6.2 

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  • スーパーコンピュータを用いた乱流の大規模直接数値シミュレーションについて Invited

    石原 卓

    流体力学会中四国九州支部講演会  2018.6.2 

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  • Vortex clusters and their time evolution in high-Reynolds-number turbulence, Invited International conference

    ISHIHARA, Takashi

    Fundamental Aspects of Geophysical Turbulence III  2018.3.19 

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  • Motion of inertial particles in high-Reynolds-number turbulence Invited International conference

    Takashi Ishihara, Naoki Kobayashi, Kei Enohata, Masayuki Umemura, Kenji Shiraishi

    NITech Lectures on Turbulence and Cloud  2018.3.8 

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  • 原始惑星系円盤乱流とダスト成長

    石原 卓

    ポスト「京」萌芽的課題・計算惑星 調査研究・準備研究フェーズ成果報告会  2017.12.20 

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  • HCCI乱流燃焼の直接数値計算を用いたnヘプタン予混合気の自己着火過程の数値解析

    久野 僚介, 石原 卓

    第28回内燃機関シンポジウム  2017.12.8 

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  • 乱流と壁の影響を受けたnヘプタンHCCI燃焼の直接数値シミュレーション

    清水 聖有, 久野 僚介, 石原 卓

    第28回内燃機関シンポジウム  2017.12.8 

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  • 原始惑星系円盤乱流場中のダスト粒子運動

    櫻井幹記, 古谷眸, 小林直樹, 岡本直也, 石原卓, 白石賢二, 梅村雅之

    日本天文学会 2017年秋季年会  2017.9.11 

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  • 乱流の直接数値計算を用いた原始惑星系円盤中の岩石ダストの衝突付着成長シミュレーション

    濱端航平, 石原卓, 白石賢二, 梅村雅之

    日本天文学会 2017年秋季年会  2017.9.11 

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  • 乱流中の微細渦構造と慣性粒子クラスタリングの関係のDNSデータ解析

    櫻井 幹記, 小林 直樹, 石原 卓

    日本流体力学会 年会2017 (東京理科大学)  2017.8.30 

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  • 高レイノルズ数乱流中の強い剪断層と圧力場のデータ解析

    石原 卓

    日本流体力学会 年会2017  2017.8.30 

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  • Reynolds Number Dependence Of Straining Motions In Turbulence International conference

    G.E. Elsinga, T. Ishihara, M.V. Goudar, C.B. da Silva, J.C.R. Hunt

    16th European Turbulence Conference  2017.8.21 

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  • Applications of Persistent Homology to Simulated Turbulent Fluid Flows on a 3D Domain International conference

    Rachel Levanger, Takashi Ishihara, Paweł Dłotko, Miroslav Kramár, Konstantin Mischaikow

    Applied Algebraic Topology 2017,  2017.8.8 

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  • Internal interfaces in turbulence Invited International conference

    ISHIHARA, Takashi

    Euromech colloquium on Turbulent/nonturbulent interfaces: from laboratory to geophysical scales  2017.7.5 

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  • Direct numerical simulations of incompressible and compressible turbulence

    Takashi Ishihara

    JAPAN-RUSSIA WORKSHOP ON INNOVATIVE APPROACHES AND SUPERCOMPUTER TECHNOLOGIES IN COMPUTATIONAL PHYSICS  2017.3.14 

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  • 原始惑星系円盤乱流場中のダスト成長過程 International conference

    石原 卓

    ポスト「京」萌芽的課題・計算惑星 第1回 公開シンポジウム：惑星の起源・進化と環境変動の解明を目指して  2017.3.6 

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    Venue：神戸大学先端融合研究環統合研究拠点 コンベンションホール  

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  • 原始惑星系円盤乱流とダスト成長

    石原 卓

    ポスト「京」萌芽的課題・計算惑星 調査研究・準備研究フェーズ成果報告会  2017.2.20 

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  • Rapid Dust Coagulation expedited by Turbulent Clustering in Protoplanetary Disks Invited

    Takashi Ishihara

    Formation of the Solar System and the Origin of Life  2017.2.20 

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    Venue：Lorentz Center@Oort  

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  • 圧縮性乱流直接数値シミュレーション手法の検討 International conference

    櫻井 幹記, 古谷 眸, 岡本 直也, 石原 卓

    第30回数値流体力学シンポジウム  2016.12.12 

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    Venue：タワーホール船堀, 東京  

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  • 乱流燃焼の2次元直接数値計算による等温壁近傍のnヘプタン自己着火過程の数値解析 International conference

    清水 聖有, 加藤正人, 石原 卓

    第27回内燃機関シンポジウム  2016.12.5 

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    Venue：東京工業大学  

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  • Vortex Clusters and Their Time Evolution in High- Reynolds-Number Turbulence

    Takashi Ishihara, Atsuya Uno, Koji Morishita, Mitsuo Yokokawa, Yukio Kaneda

    69th Annual Meeting of the APS Division of Fluid Dynamics  2016.11.20 

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  • カノニカル乱流の大規模直接数値シミュレーション International conference

    石原 卓

    第3回「京」を中核とするHPCIシステム利用研究課題成果報告会  2016.10.21 

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    Venue：コクヨホール  

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  • 大規模直接数値シミュレーションによる 乱流の速度構造関数 International conference

    石原 卓, 森下 浩二, 横川 三津夫, 宇野 篤也, 金田 行雄

    日本流体力学会 年会２０１６  2016.9.26 

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    Venue：名古屋工業大学  

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  • 一様等方性乱流中の渦構造の動的統計解析 International conference

    服部 裕司, 石原卓

    日本流体力学会 年会２０１６  2016.9.26 

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    Venue：名古屋工業大学  

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  • 乱流の直接数値計算を用いた原始惑星系円盤ダストの衝突付着成長シミュ レーション International conference

    濱端航平, 江野畑圭, 石原卓, 白石賢二, 梅村雅之

    日本天文学会2016年秋季年会  2016.9.14 

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    Venue：愛媛大学  

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  • 微惑星形成過程解明のための乱流の大規模直接数値計算と粒子追跡 International conference

    小林直樹, 江野畑圭, 石原卓, 白石賢二, 梅村雅之

    日本天文学会2016年秋季年会  2016.9.14 

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    Venue：愛媛大学  

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  • 超多自由度複雑流動現象解明のための計算科学 International conference

    石原卓

    JHPCN：学際大規模情報基盤共同利用・共同研究拠点 第8回 シンポジウム  2016.7.14 

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    Venue：THE GRAND HALL（品川）  

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  • Three types of thin shear layers observed in high Re turbulence

    Takashi Ishihara, Koji Morishita, J.C.R. Hunt

    IMA Conference on Turbulence, Waves and Mixing  2016.7.6 

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  • Thin shear layers observed in the DNS of high Reynolds number turbulence International conference

    Takashi Ishihara, Koji Morishita, Julian, C.R. Hunt

    International Symposium on Near-Wall Flows: Transition and Turbulence  2016.6.20 

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  • 原始惑星系円盤乱流中のダストの運動の数値シミュレーション International conference

    石原 卓

    宇宙生命計算科学連携拠点 第２回ワークショップ  2016.4.27 

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    Venue：筑波大学  

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  • 乱流の「第一原理計算」による原始惑星系円盤中のダスト粒子衝突過程に対する鉛直重力の影響の解析 International conference

    小林直樹, 江野畑圭, 石原卓, 白石賢二, 梅村雅之

    日本天文学会2016年春季年会  2016.3.14 

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  • 原始惑星系円盤乱流と微惑星成長 Invited International conference

    石原 卓, 江野畑圭, 小林直樹, 白石賢二, 中本泰史, 梅村雅之

    日本天文学会2016年春季年会  2016.3.14 

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  • 原始惑星系円盤における圧縮性乱流場中の粒子運動 International conference

    古谷眸, 江野畑圭, 石原卓, 白石賢二, 芳松克則, 岡本直也, 梅村雅之

    日本天文学会2016年春季年会  2016.3.14 

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  • Vortex Clusters and Their Time Evolution in High--‐Reynolds--‐Number Turbulence

    Takashi Ishihara

    A3 workshop:Vortex Dynamics and Turbulence  2016.3.13 

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    Venue：沖縄青年会館（那覇市）  

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  • カノニカルな古典乱流の大規模直接数値シミュレーション International conference

    石原 卓

    平成27年度物性研究所短期研究会「量子乱流と古典乱流の邂逅」  2016.1.5 

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    Venue：東京大学 物性研究所  

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  • 高レイノルズ数乱流中の渦の組織 構造とその時間発展 International conference

    石原 卓, 宇野 篤也, 森 下 浩二, 横川 三津夫, 金田 行雄

    第29回数値流体力学シンポジウム  2015.12.15 

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    Venue：九州大学 筑紫キャンパス  

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  • Turbulent/non-turbulent interface in turbulent magnetohydrodynamic channel flows at low magnetic Reynolds number

    Naoya Okamoto, Yusuke Otake, Takashi Ishihara

    2015 Japan-Russia Workshop  2015.12.10 

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  • Direct numerical simulations of canonical high Reynolds number turbulence

    T. Ishihara, K.Morishita, M.Yokokawa, A.Uno, Y.Kaneda

    2015 Japan-Russia Workshop  2015.12.10 

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  • General mechanisms of thin layers in high Reynolds number turbulent flows

    Julian Hunt, Takashi Ishihara, Koji Morishita

    American Physical Society 68th Annual DFD Meeting (APS-DFD2015)  2015.11.22 

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  • Energy spectrum in high Reynolds number turbulence - high resolution DNS results

    Koji Morishita, Takashi Ishihara, Yukio Kaneda, Mitsuo Yokokawa, Atsuya Uno

    American Physical Society 68th Annual DFD Meeting (APS-DFD2015)  2015.11.22 

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  • Relative diffusion of a pair of inertial particles in the inertial sub-range of turbulence

    Kei Enohata, Koji Morishita, Takashi Ishihara

    American Physical Society 68th Annual DFD Meeting (APS-DFD2015)  2015.11.22 

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  • Thin shear layers in homogeneous high Reynolds number turbulence and in turbulent boundary layers

    Takashi Ishihara, Koji Morishita, Julian Hunt

    American Physical Society 68th Annual DFD Meeting (APS-DFD2015)  2015.11.22 

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  • Analysis of Complex Spatiotemporal Structures of Vortices in High Reynolds Number Turbulence International conference

    Takashi Ishihara, Yuji Hattori

    Twelfth International Conference on Flow Dynamics (ICFD2015)  2015.10.27 

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  • カノニカル乱流の大規模直接数値シミュレーション International conference

    石原 卓

    第2回「京」を中核とするHPCIシステム利用研究課題 成果報告会  2015.10.26 

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    Venue：日本科学未来館  

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  • 宇宙規模流動現象解明のための計算科学 International conference

    石原 卓

    第7回「学際計算科学による新たな知の発見・統合・創出」シンポジウム」  2015.10.19 

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    Venue：筑波大学  

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  • 平行二等温壁間のノルマルヘプタンの自 己着火過程の直接数値シミュレーション International conference

    加藤 正人, 石原 卓, 芳松 克則

    日本流体力学会 年会２０１５  2015.9.26 

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  • ノルマルヘプタン予混合気自己着火過程 の温度場のパーシステントホモロジーを 用いた解析 International conference

    石原 卓, 末吉史弥, 荒井 迅, Mischaikow Konstantin

    日本流体力学会 年会２０１５  2015.9.26 

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  • ノルマルヘプタンの予混合自己着火過程 における流れの役割解明のための数値 実験 International conference

    末吉 史弥, 石原 卓, 芳松 克則

    日本流体力学会 年会２０１５  2015.9.26 

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  • 大規模直接数値シミュレーションによる乱流のエネルギースペクトル International conference

    石原卓, 森下浩二, 横川三津夫, 宇野篤也, 金田行雄

    日本物理学会2015年秋季大会  2015.9.16 

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    Venue：関西大学  

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  • 一様等方性乱流中の高渦度領域の動的形状解析II International conference

    服部裕司, 石原卓

    日本物理学会2015年秋季大会  2015.9.16 

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    Venue：関西大学  

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  • 乱流の直接数値計算による原始惑星 系円盤中の粒子運動に対する鉛直重力の影響の解析 International conference

    小林直樹, 江野畑圭, 石原卓, 白石賢二, 梅村雅之

    日本天文学会 2015年秋季大会  2015.9.9 

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    Venue：甲南大学  

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  • 電磁流体乱流の直接数値シミュレー ションによる原始惑星系円盤内の粒子運動の解析 International conference

    高橋良輔, 江野畑圭, 岡本直也, 芳松克則, 石原卓, 白石賢二, 梅村雅之

    日本天文学会 2015年秋季大会  2015.9.9 

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  • 微惑星形成過程解明のための乱流の直接数値計算と粒子追跡 International conference

    江野畑圭, 石原 卓, 白石賢二, 森下浩二, 中本泰史, 梅村雅之

    日本天文学会 2015年秋季大会  2015.9.9 

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    Venue：甲南大学  

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  • Accurate Parallel Algorithm for Tracking Inertial Particles in Large-Scale Direct Numerical Simulations of Turbulence

    Takashi Ishihara, Kei Enohata, Koji Morishita, Mitsuo Yokokawa, Katsuya Ishii

    PaCT2015 13th International Conference on Parallel Computing Technologies  2015.8.31 

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  • Direct numerical simulation and dissipation element analysis of an auto-ignition process in a homogeneous n-heptane/air mixture turbulence with temperature fluctuations

    Takashi Ishihara

    Workshop on Conditional statistics along lines and trajectories in turbulence  2015.8.24 

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  • 超多自由度複雑流動現象解明のための計算科学 International conference

    石原 卓

    学際大規模情報基盤共同利用・共同研究拠点第7回 シンポジウム  2015.7.9 

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    Venue：THE GRAND HALL（品川）  

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  • Coherent vorticity in turbulent channel flow: a wavelet viewpoint

    Katsunori Yoshimatsu, Teluo Sakurai, Kai Schneider, Marie Farge, Koji Morishita, Takashi Ishihara

    Ninth International Symposium on Turbulence and Shear Flow Phenomena  2015.6.30 

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  • 超多自由度複雑流動現象解明のための高効率な並列計算コード開発 International conference

    石原 卓

    名古屋大学HPC 計算科学連携研究プロジェクト成果報告シンポジウム  2015.6.3 

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    Venue：名古屋大学ES 総合館1 階ES ホール  

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  • Scalar and momentum transfer processes across stratified sheared turbulent interfaces

    J.C.R. Hunt, M. Moustaoui, A. Mahalov, T. Ishihara, J. Westerweel, M. Braza

    EUROMECH Colloquium 567: Turbulent mixing in stratified flows  2015.3.22 

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  • Direct numerical simulation of high reynolds number turbulence by the K computer

    T. Ishihara, K.Morishita, M.Yokokawa, A.Uno, Y.Kaneda

    JAPAN-RUSSIA WORKSHOP ON SUPERCOMPUTER MODELING, INSTABILITY AND TURBULENCE IN FLUID DYNAMICS  2015.3.4 

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  • カノニカル乱流の大規模直接数値計算 International conference

    石原 卓

    第27回 理論懇シンポジウム 「理論天文学・宇宙物理学と境界領域」  2014.12.24 

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    Venue：国立天文台 三鷹キャンパス すばる棟大セミナー室  

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  • 乱流燃焼の大規模直接数値シミュレーション International conference

    石原 卓

    第22回LBM研究会  2014.12.19 

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    Venue：名古屋大学  

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  • 乱流境界層における慣性粒子の運動の直接数値シミュレーション International conference

    平田 亮介, 石原 卓

    第28回数値流体力学シンポジウム  2014.12.9 

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    Venue：タワーホール船堀, 東京  

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  • ノルマルヘプタン予混合気のHCCI乱流燃焼の散逸要素解析 International conference

    浅田 宗志, 石原 卓, 芳松 克則

    第28回数値流体力学シンポジウム  2014.12.9 

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    Venue：タワーホール船堀, 東京  

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  • 一様等方性乱流の直接数値シミュレーションコードの京コンピュータ向け最適化 International conference

    森下 浩二, 横川 三津夫, 宇野 篤也, 石原 卓, 金田 行雄

    第205回ARC・第147回HPC合同研究発表会（HOKKE-22）  2014.12.9 

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    Venue：小樽経済センター  

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  • Computational science of high Reynolds number turbulence International conference

    2014.12.8 

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  • Coherent vorticity extraction in turbulent channel flow using anisotropic wavelets

    Katsunori Yoshimatsu, Teluo Sakurai, Kai Schneider, Marie Farge, Koji Morishita, Takashi Ishihara

    67th Annual Meeting of the APS Division of Fluid Dynamics  2014.11.23 

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  • Interfacial phenomena in turbulent magnetohydrodynamic channel flows at low magnetic Reynolds number

    Naoya Okamoto, Yusuke Otake, Takashi Ishihara

    67th Annual Meeting of the APS Division of Fluid Dynamics  2014.11.23 

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  • Energy Spectra of Higher Reynolds Number Turbulence by the DNS with up to 122883 Grid Points

    Takashi Ishihara, Yukio Kaneda, Koji Morishita, Mitsuo Yokokawa

    67th Annual Meeting of the APS Division of Fluid Dynamics  2014.11.23 

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  • カノニカル乱流の大規模直接数値シミュレーション International conference

    石原 卓

    第１回「京」を中核とするHPCIシステム利用研究課題 成果報告会  2014.10.31 

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    Venue：コクヨホール  

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  • 宇宙規模流動現象解明のための計算科学 International conference

    石原 卓

    第6回「学際計算科学による新たな知の発見・統合・創出」シンポジウム  2014.10.22 

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    Venue：筑波大学 計算科学研究センター  

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  • Thin shear layers in homogeneous high Reynolds number turbulence and in turbulent boundary layer

    Takashi Ishihara, Julian, C.R. Hunt

    Takashi Ishihara, Julian C.R. Hunt  2014.10.10 

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  • Vortical Structures in High Reynolds Number Turbulence (Re~105) by Large-Scale DNS on K computer

    Takashi Ishihara

    Seminar at Imperial College London  2014.10.8 

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  • Dissipation element analysis of an auto-ignition process in a homogeneous n-heptane/air mixture turbulence with temperature fluctuations

    Takashi Ishihara

    JSPS Supported Meeting on Interscale Transfers and Flow Topology in Equilibrium and Nonequilibrium Turbulence  2014.9.15 

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  • Coherent vorticity extraction in turbulent channel flow using orthogonal wavelets

    T. Sakurai, K. Yoshimatsu, K. Schneider, M. Farge, K. Morishita, T. Ishihara

    European Fluid Mechanics Conference 10  2014.9.14 

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  • Vortical Structures in the DNS of Turbulence at Reynolds Number Higher Than 104

    Takashi Ishihara

    Mini-Workshop for Turbulence Research  2014.7.11 

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  • Vortical structures in homogeneous high Reynolds number turbulence International conference

    Takashi Ishihara

    2014.4.17 

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  • 大気境界層乱流現象解明のための計算科学 International conference

    石原 卓

    平成25年度地球シミュレータ利用報告会 プログラム  2014.1.27 

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  • 高レイノルズ数乱流中の薄い剪断層とその時間変化について International conference

    石原 卓, Pradeep Jha, 金田行雄, Julian Hunt

    大スケール流体運動と乱流揺らぎ 京大 数理解析研究所 共同研究集会  2014.1.8 

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    Venue：京大 数理解析研究所  

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  • 「京」コンピュータを用いたカノニカル乱流の大規模直接数値シミュレーション International conference

    石原 卓, 森下浩二, 横川三津夫, 宇野篤也, 金田行雄

    第27回 数値流体力学シンポジウム  2013.12.17 

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    Venue：名古屋大学  

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  • 低磁気レイノルズ数MHDチャネル乱流における乱流・非乱流界面 International conference

    大竹悠介, 岡本直也, 石原 卓

    第27回 数値流体力学シンポジウム  2013.12.17 

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    Venue：名古屋大学  

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  • ノルマルヘプタンの自己着火過程の３次元DNSと温度場に着目したデータ解析 International conference

    伊藤貴政, 石原 卓

    第27回 数値流体力学シンポジウム  2013.12.17 

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    Venue：名古屋大学  

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  • Structure of the turbulent/non-turbulent interface of turbulent boundary layers - DNS results

    Takashi Ishihara, Hiroki Ogasawara, Julian C.R. Hunt

    APS-66th Annual DFD meeting  2013.11.24 

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  • Inertial Subrange Spectra in the Log-Law Layer of Turbulent Channel Flow

    Yukio Kaneda, Koji Morishita, Takashi Ishihara

    APS-66th Annual DFD meeting  2013.11.24 

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  • Temporal behavior of strong shear layers in high Reynolds number turbulence

    Pradeep K. Jha, Takashi Ishihara

    APS-66th Annual DFD meeting  2013.11.24 

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  • カノニカル乱流の大規模直接数値シミュレーション (hp120242) International conference

    石原 卓

    平成25年度 「京」を中核とするHPCIシステム利用研究課題 中間報告会  2013.10.2 

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    Venue：タイム２４ビル（東京都江東区）  

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  • 一様等方性乱流中の高渦度領域の動的形状解析 International conference

    服部裕司, 石原 卓

    日本物理学会 2013年秋季大会  2013.9.25 

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    Venue：徳島大学  

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  • 高レイノルズ数乱流中の剪断層の時間発展 International conference

    石原 卓, Jha Pradeep, 金田行雄, Julian Hunt

    日本流体力学会 年会2013  2013.9.12 

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    Venue：東京農工大  

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  • Structure of the turbulent/non-turbulent interface of turbulent boundary layers-DNS results

    Takashi Ishihara

    Turbulence Colloquium TCM2013  2013.9.5 

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  • Dynamic Geometrical Analysis of High-Enstrophy Structures in Isotropic Turbulence

    Yuji Hattori, Takashi Ishihara

    European Turbulence Conference(ETC)14  2013.9.1 

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  • Thin Shear Layers In High Reynolds Number Turbulence- A Coherent-structure Model

    Julian Hunt, Takashi Ishihara, Yukio Kaneda

    ETC14  2013.9.1 

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  • Thin Shear Layers In High Reynolds Number Turbulence-Dns Results

    Takashi Ishihara, Julian Hunt, Yukio Kaneda

    ETC14  2013.9.1 

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  • 超多自由度複雑流動現象解明のための計算科学 International conference

    石原 卓

    学際大規模情報基盤共同利用・共同研究拠点第5回シンポジウム  2013.7.11 

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    Venue：THE GRAND HALL（東京）  

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  • 高レイノルズ数乱流の渦構造について International conference

    石原 卓

    「宇宙生命計算科学連携拠点」ワークショップ  2013.6.28 

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    Venue：筑波大学計算科学研究センター ワークショップ室  

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  • Conditional Analysis of Statics Obtained Near the Turbulent/Non-Turbulent Interface of Turbulent Boundary Layers

    T. Ishihara, H. Ogasawara

    ERCOFTAC SYMPOSIUM on Unsteady Separation in Fluid-Structure Interaction  2013.6.17 

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  • Turbulence Near Interfaces- Modelling and Simulations

    J.C.R. Hunt, T. Ishihara, Y. Hoarau, M. Braza

    ERCOFTAC SYMPOSIUM on Unsteady Separation in Fluid-Structure Interaction  2013.6.17 

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  • 乱流境界層の乱流・非乱流界面近傍の条件付き統計解析 International conference

    石原 卓, 小笠原浩樹

    九大応力研共同利用研究集会「壁乱流における大規模構造の統計法則と動力学に果たす役割」  2013.2.23 

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    Venue：九州大学  

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  • 高レイノルズ数チャネル乱流の非等方スペクトル International conference

    森下 浩二, 石原 卓, 金田 行雄

    九大応力研共同利用研究集会「壁乱流における大規模構造の統計法則と動力学に果たす役割」  2013.2.23 

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    Venue：九州大学  

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  • 高レイノルズ数乱流中の強い渦の組織構造 International conference

    石原 卓

    RIMS 共同研究 研究集会「偏微分方程式の背後にある確率過程と解の族が示す統計力学的な現象の解析」  2013.2.14 

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    Venue：京都大学  

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  • ノルマルヘプタンの自己着火過程における反応と乱流の相互作用の3次元DNSとデータ解析 International conference

    三木貴史, 生田博也, 寺地 淳, 石原 卓

    第26回数値流体力学シンポジウム  2012.12.18 

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    Venue：国立オリンピック記念青少年総合センター  

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  • 乱流境界層のDNSにおける乱流・非乱流界面近傍の構造と統計 International conference

    小笠原浩樹, 石原 卓

    第26回数値流体力学シンポジウム  2012.12.18 

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    Venue：国立オリンピック記念青少年総合センター  

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  • Strong Shear Layer in High Re Turbulence - DNS Results

    Takashi Ishihara

    Mini Workshop on Urban Research a Review & Outlook on the Hong Kong Built Environment  2012.12.7 

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  • n-Heptane予混合圧縮自己着火過程の３次元直接数値シミュレーションに基づくデータ解析 International conference

    三木貴史, 生田博也, 寺地 淳, 石原 卓

    第50回燃焼シンポジウム  2012.12.5 

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    Venue：愛知県産業労働センターウインクあいち  

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  • Small-scale statistics in direct numerical simulation of turbulent channel flow up tp Ret=5120

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    APS 65th annual DFD meeting  2012.11.18 

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  • Intense dissipative mechanisms of strong thin shear layers in high Reynolds number turbulence

    Takashi Ishihara, Julian C.R.Hunt, Yukio Kaneda

    APS 65th annual DFD meeting  2012.11.18 

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  • Conditional analysis of the statistics near the turbulent/non-turbulent interface of turbulent boundary layers

    Hiroki Ogasawara, Takashi Ishihara

    APS 65th annual DFD meeting  2012.11.18 

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  • ノルマルヘプタン自己着火過程における反応と乱流の相互作用の三次元DNS 解析 International conference

    寺地 淳, 生田博也, 三木貴史, 石原 卓

    第23回内燃機関シンポジウム  2012.10.31 

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    Venue：北海道大学  

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  • Strong thin shear layers in homogeneous high Re turbulence- structures and statistics

    Takashi Ishihara, Julian, C.R. Hunt, Yukio Kaneda

    First Multiflow Conference on the Turbulent-Non turbulent interface, Madrid, Spain  2012.10.25 

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  • 4D visualization of isotropic turbulence and dynamics of high-enstrophy structures

    Yuji Hattori, Takashi Ishihara

    2012.9.27 

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  • Interactive visualizations of the large-scale data generated by the DNS of isotropic turbulence on 40963 grid points

    Takashi Ishihara, Kensaku Mori

    JSST2012 International Conference on Simulatin Technology  2012.9.27 

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  • Improvement of Reality of CG Motion Pictures by Hydrodynamic Effects

    Takashi Ishihara, Yuji Hattori

    Ninth International Conerence on Flow Dynamics  2012.9.19 

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  • レイノルズ数の異なる 4096 3 DNS 乱流のマルティフラクタルPDF理論による比較解析 International conference

    武智公平, 有光直子, 有光敏彦, 金田行雄, 石原 卓

    日本物理学会 2012年秋季大会  2012.9.18 

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    Venue：横浜国立大学  

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  • 乱流境界層の直接数値シミュレーションを用いた乱流・非乱流界面の解析 International conference

    小笠原浩樹, 石原 卓, 金田行雄

    日本流体力学会年会２０１２  2012.9.16 

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    Venue：高知大学  

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  • 一様磁場中における電磁流体チャネル乱流の直接数値計算 International conference

    大竹悠介, 岡本直也, 石原 卓

    日本流体力学会年会２０１２  2012.9.16 

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    Venue：高知大学  

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  • 高レイノルズ数一様等方性乱流中の強い剪断層 International conference

    石原 卓, Hunt Julian C.R, 金田行雄

    日本流体力学会年会２０１２  2012.9.16 

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    Venue：高知大学  

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  • 大規模直接数値シミュレーションによる周期境界乱流中のエネルギー散逸率とエネルギースペクトル International conference

    金田行雄, 石原 卓, 横川三津夫, 板倉憲一, 宇野篤也

    日本流体力学会年会２０１２  2012.9.16 

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    Venue：高知大学  

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  • 直接数値計算による三次元レイリー・ベナール対流乱流の渦構造 International conference

    丹羽佑太, 星野邦雄, 芳松克則, 石原 卓

    日本流体力学会年会２０１２  2012.9.16 

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    Venue：高知大学  

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  • Numerical Analysis of Effect of Intermediate Species Diffusion on Low Temperature Oxidation Process in a Homogeneous n-Heptane Mixture

    Atsushi Teraji, Takashi Ishihara, Yukio Kaneda

    COMODIA 2012  2012.7.23 

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  • 高レイノルズ数乱流の計算科学 International conference

    石原 卓

    流体若手夏の学校2012  2012.7 

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    Venue：京都  

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  • Volume Penalization 法による翼果まわりの流れの数値解析 International conference

    澤村陽一, 石原 卓

    研究集会「生物流体力学における同期および関連する現象」  2012.5.21 

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    Venue：京都大学数値解析研究所  

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  • 乱流の計算科学 International conference

    石原卓

    九州大学大学院総合理工学府 大気海洋環境システム学専攻 集中講義  2012.1 

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    Venue：九州大学大学院総合理工学府  

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  • nヘプタンの簡略反応モデルを用いた自己着火過程の3次元直接数値シミュレーション International conference

    生田博也, 石原 卓, 寺地 淳

    第25回数値流体力学シンポジウム  2011.12.19 

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    Venue：大阪大学コンベンションセンター  

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  • Volume Penalization 法による翼果モデルまわりの流れの数値解析 International conference

    澤村陽一, 石原 卓

    第25回数値流体力学シンポジウム  2011.12.19 

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    Venue：大阪大学コンベンションセンター  

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  • High-performance computing of canonical high-Reynolds-number turbulent flows

    Takashi Ishihara

    ICTS-TIFR Discussion Meeting-2011  2011.12.12 

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  • Strong thin shear layers in high Reynolds number turbulence

    Takashi Ishihara, Julian, C.R. Hunt, Yukio Kaneda

    64th annual meeting of the APS division of fluid dynamics  2011.11.20 

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  • The structure of the vorticity field in the near-wall region of turbulent channel flow at high-Reynolds number

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    64th annual meeting of the APS division of fluid dynamics  2011.11.20 

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  • 高レイノルズ数平行平板間乱流ＤＮＳにおける小スケール統計 International conference

    森下浩二, 石原 卓, 金田行雄

    平成２３年度共同利用研究集会「乱流現象及び非平衡系の多様性と普遍性」  2011.11.10 

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    Venue：九州大学応用力学研究所  

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  • nヘプタンの簡略反応モデルを用いた乱流中の自己着火現象の直接数値計算 International conference

    生田博也, 石原 卓, 寺地 淳

    平成２３年度共同利用研究集会「乱流現象及び非平衡系の多様性と普遍性」  2011.11.10 

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    Venue：九州大学応用力学研究所  

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  • Improvement of reality of CG motion pictures by hydrodynamic effects

    Takashi Ishihara, Yuji Hattori

    2011.11.9 

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  • DNS study of the small-scale statistics in turbulent channel flow at high-Reynolds numbers International conference

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    CCS Symposium Autumn 2011  2011.11.1 

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  • Strong shear layers in high Reynolds number homogeneous turbulence

    Takashi Ishihara

    CCS Symposium Autumn 2011  2011.11.1 

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  • 40963DNS乱流のマルティフラクタル確率密度関数理論による解析 International conference

    有光直子, 武智公平, 有光敏彦, 金田行雄, 石原 卓

    日本物理学会２０１１年秋季大会  2011.9.21 

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  • Conditional analysis near strong shear layers in DNS of isotropic turbulence at high Reynolds number

    Takashi Ishihara, J.C.R. Hunt, Yukio Kaneda

    13 European Turbulence Conference  2011.9.12 

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  • Small-scale statistics in direct numerical simulation of turbulent channel flow at high-Reynolds number

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    13 European Turbulence Conference  2011.9.12 

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  • 渦・境界相互作用の大規模数値計算による研究 International conference

    石原 卓

    第2回数学領域シンポジウム  2011.9.7 

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    Venue：アキバプラザ  

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  • 2D direct numerical simulation of intermediate species diffusion in low temperature oxidation process

    Atsushi Teraji, Takahiro Morikawa, Takashi Ishihara, Yukio Kaneda

    ICDERS  2011.7.24 

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  • 超多自由度複雑流動現象解明のための計算科学 International conference

    石原 卓

    学際大規模情報基盤共同利用・共同研究拠点第３回シンポジウム  2011.7.14 

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    Venue：東京  

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  • Conditional statistics near strong thin shear layers in DNS of high Reynolds number turbulence

    Takashi Ishihara

    Seminar at the University of Hong Kong  2011.6.16 

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  • 超多自由度複雑流動現象解明のための高効率な並列計算コード開発 International conference

    石原 卓

    名古屋大学HPC計算科学連携研究プロジェクト成果報告シンポジウム  2011.5.10 

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    Venue：名古屋大学高等研究院  

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  • Conditional statistics near strong thin shear layers in DNS of high Re turbulence

    Takashi Ishihara

    KITP Program: The Nature of Turbulence  2011.4.20 

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  • Conditional statistics near strong thin shear layers in DNS of isotropic turbulence at high Reynolds number

    Takashi Ishihara, Julian C.R. HUNT, Yukio Kaneda

    The School of Mathematical & Statistical Sciences (SoMSS) Seminar  2011.4.13 

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  • Local-isotropy in direct numerical simulation of turbulent channel flow at high-Reynolds number

    Koji Morishita, Takashi Ishihara, Yukio Kaneda

    SIAM Conference on Computational Science and Engineering  2011.2.28 

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  • Nヘプタンの簡略化反応モデルを用いた自己着火過程の2次元直接数値計算 - 自己着火過程の温度依存性の検討 International conference

    森川貴弘, 西田成志, 寺地 淳, 石原 卓, 金田行雄

    第24回数値流体力学シンポジウム  2010.12.20  日本流体力学会

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    Venue：慶應義塾大学日吉キャンパス  

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  • 高レイノルズ数チャネル乱流の局所等方性のDNSによる検証 International conference

    森下浩二, 石原 卓, 金田行雄

    第24回数値流体力学シンポジウム  2010.12.20  日本流体力学会

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    Venue：慶應義塾大学日吉キャンパス  

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  • Conditional statistics near strong thin shear layers in DNS of isotropic turbulence at high Reynolds number

    Takashi Ishihara, Julian, C.R. Hunt, Yukio Kaneda

    63rd Annual Meeting of the APS Division of Fluid Dynamics  2010.11.21 

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  • 乱流混合層DNSを用いた乱流／非乱流界面近傍の渦構造の条件付き統計の解析 International conference

    石原 卓, 後藤 崇, 金田行雄

    平成22年度共同利用研究集会「乱流現象及び非平衡系の多様性と普遍性」  2010.11.11 

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    Venue：九州大学応用力学研究所  

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  • ノルマルヘプタン均質予混合場における中間生成物拡散が低温酸化反応過程に与える影響の数値解析 International conference

    寺地 淳, 西田成志, 森川貴弘, 石原 卓, 金田行雄

    第21回内燃機関シンポジウム  2010.11.10 

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    Venue：岡山大学  

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  • Large-scale and high-resolution direct numerical simulation of turbulent boundary layer: dynamics of hairpin vortex structures

    Takashi Ishihara

    Japan-Russia Workshop on Numerical Investigation of Hydrodynamic Instabilities and Turbulence with High-performance Computing  2010.10.6 

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  • 高レイノルズ数乱流の大規模直接数値シミュレーション -乱流の大規模データベースの生成・解析・可視化- International conference

    石原 卓

    第一回計算科学セミナー  2010.9.27 

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    Venue：名古屋大学環境総合館, 名古屋市  

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  • 乱流の大規模直接数値計算データを用いた４次速度構造関数及び圧力勾配・速度構造関数の解析 International conference

    中西崇仁, 石原 卓

    日本物理学会 平成22年度 秋季大会  2010.9.23  日本物理学会

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    Venue：大阪府立大学  

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  • 乱流境界層の直接数値シミュレーションにおけるヘアピン渦構造の力学 International conference

    石原 卓, 加藤雅之, 金田行雄

    日本流体力学会 年会2010  2010.9.9  日本流体力学会

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    Venue：北海道大学  

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  • 乱流混合層における乱流／非乱流界面近傍の渦構造と条件付き統計 International conference

    後藤 崇, 石原 卓, 金田行雄

    日本流体力学会 年会2010  2010.9.9  日本流体力学会

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    Venue：北海道大学  

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  • nヘプタンの簡略化反応モデルを用いた自己着火過程の2次元直接数値シミュレーション International conference

    西田成志, 寺地淳, 石原 卓, 金田行雄

    第23回数値流体力学シンポジウム  2009.12.16 

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  • スペクトル法を用いた乱流境界層の直接数値計算 International conference

    石原 卓, 加藤雅之, 金田行雄

    第87期日本機械学会流体工学部門講演会  2009.11.7 

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  • Computational analysis of high Reynolds number turbulence using pressure gradient vector field

    Takashi Ishihara, Kazuki Takahashi

    RIMS Workshop on Mathematics and Physics across the Diversity of Turbulence Phenomena, the Kobe Institute  2009.7.9 

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  • Examination of Kolmogorov's 4/5 law by high-resolution DNS data of turbulence International conference

    2007.12.19 

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  • 大規模DNSデータを用いたKolmogorovの4/5法則の検証 International conference

    吉野 順也, 石原 卓, 金田 行雄

    九州大学応用力学研究所平成19年度共同利用研究集会「乱流現象及び多自由度系の動力学，構造と統計法則」  2007.11.23 

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    Venue：九州大学応用力学研究所, 福岡県春日市  

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  • Some Attempts at Computer Aided Understanding of Turbulence

    IUTAM Symposium 2006 NAGOYA `Computational Physics and New Perspectives in Turbulence'  2006.9.12 

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  • Ultra Direct Numerical Simulation of Turbulence on the Earth Simulator

    Takashi Ishihara

    6th World Congress on Computational Mechanics, Beijing, China  2004.9 

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  • 乱流のUltra DNSデータの解析 International conference

    石原 卓

    統計数理解析研究所 研究集会：乱流の統計理論とその応用  2004.3 

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  • 乱流の Ultra DNS データの解析 －エネルギースペクトルのレイノルズ数依存性－ International conference

    石原 卓, 金田 行雄

    第17回数値流体力学シンポジウム  2003.12.17 

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    Venue：国立オリンピック記念青少年センター, 東京  

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  • 大規模直接数値計算による非圧縮乱流場のデータ解析ーエネルギー散逸・エンストロフィー・圧力のスペクトルについて International conference

    石原 卓, 金田行雄

    九州大学応用力学研究所 研究集会：乱流研究の異分野融合と新たな創成  2003.12 

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  • Reynolds number dependence of the one-point statistics of velocity-derivatives in high-resolution DNS of incompressible turbulence

    Takashi Ishihara, Yukio Kaneda

    The American Physical Society, 56th Annual Meeting of the Division of Fluid Dynamics  2003.11.23 

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  • 一様せん断乱流における慣性小領域の非等方的構造 International conference

    吉田 恭, 石原 卓, 金田 行雄

    第52回理論応用力学講演会  2003.1.28 

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    Venue：東京  

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  • 地球シミュレータによる乱流の ultra simulation International conference

    金田 行雄, 石原 卓, 横川 三津夫, 板倉 憲一, 宇野 篤也

    九州大学応用力学研究所研究集会「乱流現象の多様性と普遍性」  2002.12.11 

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    Venue：九州大学応用力学研究所, 春日市  

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  • 乱流のUltra Simulation International conference

    石原 卓, 金田行雄, 横川三津夫, 板倉憲一, 宇野篤也

    第６回シミュレーション・サイエンスシンポジウム  2002.12  核融合科学研究所

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  • 16.4-Tflops Direct Numerical Simulation of Turbulence by a Fourier Spectral Method on the Earth Simulator

    Mitsuo Yokokawa, Kenichi Itakura, Atsuya Uno, Takashi Ishihara, Yukio Kaneda

    Super Computing 2002  2002.11.16 

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  • High Resolution DNS of Incompressible Homogeneous Forced Turbulence -Time Dependence of the Statistics-Statistical Theories and Computational Approaches to Turbulence; Modern Perspectives and Applications to Global-Scale Flows

    Takashi Ishihara, Yukio Kaneda

    Yukio Kaneda and Toshiyuki Gotoh (Eds.), Springer-Verlag Tokyo  2002.11 

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  • Spectra of Fourth Order Velocity Moment in Homogeneous Isotropic Turbulence:Direct Numerical simulation and Lagrangian Theory

    Yukio Kaneda, Takashi Ishihara

    IUTAM Sympojium on Reynolds Number Scaling in Turbulent Flow  2002.9.11 

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  • 乱流の非等方スペクトルとそのReynolds数依存性 International conference

    吉田恭, 石原卓, 金田行雄

    日本流体力学会年会2002  2002.7 

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    Venue：仙台国際センター, 仙台市  

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  • 一様等方性乱流のシミュレーション：スペクトル法vs高次精度線の方法 International conference

    芳松克則, 石原卓, 山崎陽介, 金田行雄, 西田秀利, 中井聡, 里深信行

    日本物理学会第57回年次大会,  2002.3.24 

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    Venue：立命館大学, 草津市  

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  • 一様シアー乱流の非等方スペクトル International conference

    石原卓, 吉田恭, 金田行雄

    日本物理学会第57回年次大会  2002.3.24 

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    Venue：立命館大学, 草津市  

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  • 成層乱流のラージ・エディ・シミュレーションとサブグリッド・モデリング International conference

    吉田恭, 石原卓, 金田行雄

    第3回非静力学モデルに関するワークショップ  2001.9.18 

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    Venue：学術総合センター, 東京都  

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  • 三次元乱流場の予測可能性 ― 大規模渦のデータ同化の影響 International conference

    林一樹, 石原卓, 金田行雄

    日本物理学会2001年秋季大会  2001.9.17 

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    Venue：徳島分理大学, 徳島市  

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  • 三次元乱流場における二粒子拡散について ― 慣性小領域の有限性の影響 International conference

    石原卓, 金田行雄

    日本物理学会2001年秋季大会  2001.9.17 

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    Venue：徳島分理大学, 徳島市  

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  • 成層乱流のスペクトルLES International conference

    吉田恭, 石原卓, 金田行雄

    日本流体力学会年会2001  2001.7.31 

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    Venue：工学院大学, 東京都  

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  • 乱流の慣性小領域におけるラグランジュ統計 International conference

    石原卓, 金田行雄

    研究集会：乱流構造の数理 ― 発生・動力学・統計・応用（Study of Turbulence Structure ― Generation, Dynamics, Statistics and Application）  2001.7 

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    Venue：京都大学数理解析研究所  

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  • 3次元等方性乱流の予測可能性の評価 International conference

    藤田大志, 吉田恭, 石原卓, 金田行雄

    日本物理学会第56回年次大会  2001.3.27 

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    Venue：中央大学多摩キャンパス, 八王子市  

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  • 2次元乱流における予測可能性とLES International conference

    山平倫道, 吉田恭, 石原卓, 金田行雄

    日本物理学会第56回年次大会  2001.3.27 

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    Venue：中央大学多摩キャンパス, 八王子市  

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  • 非等方性乱流のLESスペクトル理論モデルの a posteriori テスト International conference

    藤村宣昭, 山崎陽介, 石原卓, 金田行雄

    日本物理学会春の分科会  2001.3 

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    Venue：関西大学, 吹田市  

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  • 慣性小領域における3波相互作用の相似性 International conference

    石原卓, 金田行雄

    日本物理学会春の分科会  2001.3 

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    Venue：関西大学, 吹田市  

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  • 大規模乱流DNSデータの可視化 International conference

    石原卓, 大野哲也, 森建策, 末永康仁, 石井克哉, 金田行雄

    九州大学応用力学研究所研究集会  2000.12 

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  • 成層乱流のラージ・エディ・シミュレーション International conference

    藤村宣昭, 石原卓, 金田行雄

    日本物理学会第55回年次大会  2000.9 

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    Venue：新潟大学, 新潟市  

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  • 大規模乱流シミュレーションにおける高波数成分の取り扱い方の影響 International conference

    山崎陽介, 石原卓, 金田行雄

    日本物理学会第55回年次大会  2000.9 

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    Venue：新潟大学, 新潟市  

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  • Statistics of small-scale structure of homogeneous isotropic turbulence

    IUTAM Symposium on Geometry and Statistics of Turbulence  1999.11.1 

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  • 一様等方乱流中の微細構造の統計（大規模DNSデータベース解析） International conference

    石原卓, 山崎陽介, 金田行雄

    九州大学応用力学研究所研究集会  1999.11 

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  • 乱流の大規模数値実験 International conference

    石原 卓

    九州大学応用力学研究所 研究集会：流体方程式の解と縮約解析  1999.10 

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  • Leithによる2次元LESモデルの検証 International conference

    大川新太朗, 石原卓, 金田行雄

    日本物理学会秋の分科会  1999.9 

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    Venue：岩手大学, 盛岡市  

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  • 3次元乱流のLESスペクトル理論モデルの a posteriori テスト International conference

    石川綱一郎, 石原卓, 金田行雄

    日本物理学会秋の分科会  1999.9 

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    Venue：岩手大学, 盛岡市  

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  • Numerical studies of large scale turbulent flows in two and three dimensions

    Kamen N. Beronov, Takashi Ishihara, Yukio Kaneda

    Oxford-Kobe seminar: The Second Scientific Meeting on System Engineering and Applied Mathematics  1998.12.3 

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  • Numerical Studies of Large Scale Turbulent Flows in Two and Three Dimensions

    Kamen N. Beronov, Takashi Ishihara, Yukio Kaneda

    Oxford Kobe Seminars: The Second Scientific Meeting on Systems Engineering and Applied Mathematics  1998.12 

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  • 回転乱流中の粒子拡散 International conference

    山崎陽介, 石原卓, 金田行雄

    九州大学応用力学研究所研究集会「乱流現象とその周辺」  1998.11.26 

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    Venue：福岡県春日市  

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  • 一様等方乱流中の微細構造の統計（大規模DNSデータベース解析） International conference

    石原卓, 山崎陽介, 金田行雄

    九州大学応用力学研究所研究集会「乱流現象とその周辺」  1998.11.26 

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    Venue：福岡県春日市  

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  • 一様ストレイン場中の渦層の Analytic Structure International conference

    石原卓, 金田行雄

    研究集会：計算流体力学に関わる数理的諸問題  1996.6.24 

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    Venue：京都大学数理解析研究所  

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  • Singularity Formation in the Shape of a Vortex Sheet in Three-Dimensions - Numerical Simulation

    Takashi Ishihara, Yukio Kaneda

    Proceedings of the Second International Workshop on Vortex Flows and Related Numerical Methods  1995.8 

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  • Spontaneous Singularity Formation in the Shape of Vortex Sheet in Three-Dimensional Flow: Analysis and Numerical Simulation International conference

    1994.5.30 

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  • 3次元的渦面の運動の解析と数値シミュレーション International conference

    石原卓, 金田行雄

    研究集会：流体における波動現象の数理とその応用  1993.10.27 

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    Venue：京都大学数理解析研究所  

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  • Lagrange 的 Strain Tensor の相関時間 International conference

    石原卓, 金田行雄

    研究集会：乱流の発生と統計法則  1992.1.21 

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    Venue：京都大学数理解析研究所  

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▼display all

Awards

  • JSST 2021 Best Author Award

    2021.8   Japan Society for Simulation Technology   Direct Numerical Simulations of Navier-Stokes Equation in Astrophysics : The Growth of Dust Grains in Protoplanetary Disk Turbulence

    Masayuki Umemura, Takashi Ishihara

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  • Award for Outstanding Paper in Fluid Mechanics

    2012.2   Energy Dissipation Rate and Energy Spectrum in High Resolution Direct Numerical Simulations of Turbulence in a Periodic Box

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  • SC2002 Gordon Bell Award

    2002.11   IEEE   16.4-Tflops Direct Numerical Simulation of Turbulence by a Fourier Spectral Method on the Earth Simulator

    M Yokokawa, K Itakura, A Uno, T Ishihara, Y Kaneda

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Research Projects

  • 複雑流動場における極端現象の新しい予測・診断技術創出のためのデータ記述科学の開拓

    Grant number：23H04473  2023.04 - 2025.03

    日本学術振興会  科学研究費助成事業  学術変革領域研究(A)

    石原 卓

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    Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

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  • A new scenario of dust growth in protoplanetary disks explored through large-scale direct numerical simulations of turbulence

    Grant number：20H01948  2020.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    石原 卓, 奥住 聡, 梅村 雅之

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    Authorship：Principal investigator 

    Grant amount：\16900000 （ Direct expense: \13000000 、 Indirect expense：\3900000 ）

    原始惑星系円盤のダスト成長の新シナリオ構築のため乱流の大規模直接数値計算を活用した研究を進めている。本年度は慣性の大きさの異なるダスト粒子の乱流中の運動について、弱圧縮性乱流の高精度高解像度差分法に基づく直接数値計算（DNS）で得られたデータの解析を行なった。その結果を非圧縮性乱流のフーリエスペクトル法に基づくDNSの結果と比較することで、圧縮性乱流場では非圧縮性乱流場とは異なり、速度の圧縮成分の存在に起因する密度や圧力の変動が観察されるが、圧縮性の弱い（マッハ数0.3以下の）乱流中のダストの運動は本質的には速度のソレノイダル成分に支配されていることを明らかにした。そして、同様な結果が等温を仮定した圧縮性乱流のDNSにおいても得られることを確認した。これにより原始惑星系円盤中のダスト成長を考える際の乱流は理論的には非圧縮として扱って特に問題ないことを実証した。また、高レイノルズ数乱流場の特徴として、小スケールにおける速度変動が著しく非一様であり、局所的な慣性力と粘性力の比として定義される局所レイノルズ数も非一様となることが知られていたが、非圧縮性乱流の大規模DNSデータを用いた新たな解析により、テイラー長に基づくレイノルズ数が1100と高い乱流場においても、局所レイノルズ数は揺らぎが大きいものの平均は70程度と小さいこと、および、局所的な渦度の大きさに依存しないことを明らかにした。さらに、高レイノルズ数乱流中においては平均的なエンストロフィーの値が高いアクティブな領域と低い非アクティブな領域が存在することが知られているが、乱流DNSを用いた粒子追跡シミュレーションのデータの解析により、乱流中の粒子の相対拡散の仕方が初期粒子位置に依存して、古典的なリチャードソンの法則に従わない場合があることを明らかにした。

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  • Computational science of inertial particle clustering in high Reynolds number turbulence

    Grant number：15H03603  2015.04 - 2018.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

    Ishihara Takashi, MORISHITA Koji, OKAMOTO Naoya, KANEDA Yukio, YOSHIMATSU Katsunori, ISHII Katsuya, HUNT Julian, ENOHATA Kei, KOBAYASHI Naoki, HAMABATA Kohei, SAKURAI Yoshiki

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    Grant amount：\16380000 （ Direct expense: \12600000 、 Indirect expense：\3780000 ）

    By developing a highly accurate and efficient parallel program for analyzing the motion of inertial particles in turbulent flows, we realized large-scale numerical experiments for tracking the particles in direct numeical simulations of turbulence. The relationships between vortex-cluster structures, which are unique to high Reynolds number turbulence, and the motion of inertial particles were investigated. As a result, we showed that particles with large inertia tend to concentrate on the outside of the vortex cluster. We also clarified the Reynolds number dependence of the behavior of particles with large inertia and provided reliable results on the role of turbulence in the planetesimal formation process in protoplanetary disks.

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  • Development of Statitical Theory of Turbulent Boundary Layer

    Grant number：26400410  2014.04 - 2019.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KANEDA Yukio

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    Grant amount：\3640000 （ Direct expense: \2800000 、 Indirect expense：\840000 ）

    Turbulent boundary layer (TBL) near solid boundary is common in science and technology. In TBL, the flow field changes rapidly in space, and the TBL strongly affects the whole flow field. In this study, we clarified quantitatively the position- and direction- dependence of representative length-scales characterizing the TBL, on the basis of the data of large-scale direct numerical simulation (DNS) of turbulent flow between two parallel planes (turbulent channel flow: TCF).
    By generalizing the idea of linear response theory well known in the statistical mechanics of systems at or near thermal equilibrium state to TBL, we derived a theory for one-point statistics in the TBL, and confirmed that the theory is in good agreement with the data of high resolution DNS of TCF.

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  • Turbulent/non-turbulent interface in magnetohydrodynamic channel flow in an imposed magnetic field

    Grant number：26390129  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Okamoto Naoya, ISHIHARA Takashi

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    Grant amount：\4940000 （ Direct expense: \3800000 、 Indirect expense：\1140000 ）

    Direct numerical simulations (DNSs) are performed to show the presence of turbulent/non-turbulent interfaces in a magnetohydrodynamic (MHD) turbulent channel flow under the influence of a wall-normal magnetic field. Visualization of the vorticity field reveals flow structures consisting of two internal turbulent boundary layers (ITBLs) growing from each wall and a non-turbulent channel core. The flow structures suggest the presence of an interface between the ITBL and the core. The conditional statistics of the DNS data shows that vorticity components have sharp gradients at the interface as observed in external hydrodynamic shear flows. The Joule dissipation rate, a characteristic quantity in MHD flow, is shown to have sharp gradients at the interface.

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  • Simulation Code Optimization for DNS of Turbulence toward Peta-scale Computing

    Grant number：26390130  2014.04 - 2017.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    YOKOKAWA MITSUO, ISHIHARA Takashi

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    Grant amount：\3510000 （ Direct expense: \2700000 、 Indirect expense：\810000 ）

    A parallel direct numerical simulation (DNS) code was developed on the K computer for solving the Navier-Stokes equations in a box with periodic boundary conditions for three orthogonal axes. The objective of the code is to simulate behaviors of homogeneous, isotropic incompressible turbulent flow, or canonical turbulent flow, which is the most standard flow among turbulent flows without boundary walls. Pesudo-spectral method is used for discretization in 3-dimensional space and forth-order Runge-Kutta method is used for temporal discretization. Hybrid parallelization with both OpenMP and MPI are adopted in the code. The DNS with grid points of 12288 cubed were carried out on the K computer with sustained performance of 2.2% on the 37,376 compute nodes. Simulation data for about Reynolds number 2300 were obtained.

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  • Computational study on dynamics of anisotropic turbulence and development of turbulence modeling

    Grant number：25390149  2013.04 - 2016.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Yoshimatsu Katsunori, OKAMOTO Naoya, ISHIHARA Takashi

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    Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

    We examined dynamics of three-dimensional (3D) homogeneous turbulence, in particular (1) error growth, (2) influence of small-scale vortices on turbulent statistics at large-scale statistics, and (3)decay of passive scalar turbulence, using direct numerical simulation (DNS). We find the following. (1) The large-scale statistics are not sensitive to the vortex structures and dynamics. (2) The error field exhibits self-similar growth so that its energy increases as k 4 t 6, where k is a wavenumber and t is time. The large-scale properties of the error play significant roles in the growth. (3) The large-scale invariant of a passive scalar is shown as the first DNS evidence. A turbulent model using orthogonal wavelets was developed for 3D turbulent channel flows bounded by two parallel planes. It is found that coherent vorticity, reconstructed from few intense vorticity wavelet coefficients, well preserves the statistical predictability and vortices of the turbulent flows.

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  • Computational Science for understanding the vortical structure and vortex dynamics in high Reynolds-number turbulence

    Grant number：23560194  2011.04 - 2015.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Takashi, YOSHIMATU Katsunori, OKAMOTO Naoya

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    Grant amount：\5200000 （ Direct expense: \4000000 、 Indirect expense：\1200000 ）

    Using direct numerical simulation(DNS) of turbulence in a periodic box with a maximum of 4096^3 grid points and Taylor micro-scale Reynolds numbers Rλ up to 1131, it is shown that there is a transition in the forms of the significant vortical structures, from isolated vortices (when Rλ is less than 100) to complex thin-shear layers (when Rλ exceeds about 1000). Within the significant layers, strong vortices are generated with micro-scale thickness 10η (η is the Kolmogorov micro scale). The interfaces of the layers act partly as a barrier to the fluctuations outside the layer.
    We also performed the DNS of turbulent boundary layers (TBL) along a flat plate to study the properties of turbulent/non-turbulent (T/NT) interface of the TBL. Analysis of the conditional statistics near the interface shows that conditional cross correlations of the streamwise or the wall-normal velocity change sharply across the interface. This is consistent with the blocking mechanism of the interface.

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  • Structure, energy transfer and material transport near turbulent-nonturbulent interface

    Grant number：23540447  2011 - 2013

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KANEDA Yukio, ISHIHARA Takashi

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    Grant amount：\4940000 （ Direct expense: \3800000 、 Indirect expense：\1140000 ）

    Interfaces between strongly turbulent and almost non-turbulent regions often appear in flows in nature and technology. Such interfaces are called here turbulent-nonturbulent(T-NT) interfaces. We have studied T-NT interfaces within turbulent flows with particular attention to the flow structure, energy transfer and material transport near the interfaces. By applying the method of conditional statistical analysis to the data of direct numerical simulations with the number of grid points up to the cube of 4096, we have revealed some characteristic features of the structure and energy transfer.

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  • Study of a 3D Cavity Flow using the Numerical Scheme with High Accuracy

    Grant number：21540383  2009 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHII Katsuya, ISHIHARA Takashi, ADACHI Shizuko, HIRANO Yasushi, KANEDA Yukio

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    Grant amount：\4420000 （ Direct expense: \3400000 、 Indirect expense：\1020000 ）

    Numerical simulations are carried out for the three-dimensional steady flow in a lid-driven rectangular cavity using the combined compact scheme with high accuracy and high resolution. We study the incompressible flow in a cavity with spanwise aspect ratio 1. 0 and 6. 55, and aspect ratios 0. 4, 0. 6, 1. 0 and 1. 4. Streamlines are obtained from the steady velocity field data with high accuracy and Poincare sections are plotted from the streamlines for Reynolds numbers ranging from 100 to 500. There are two types of streamlines : localized streamlines near a closed curve and chaotic streamlines. In the Poincare sections we can find various structures of ovals of invariant tori and resonant islands by localized streamlines in the regions near the end-wall and irregularly distributed points by chaotic streamlines. The structures in the Poincare sections are similar to those in the phase portraits of one-dimensional non-autonomous Hamiltonian system. In particular, we found that the Poincare sections of streamlines show striking similarities for the 3 : 1 and 2 : 1 resonances as the Reynolds number is changed. When the Reynolds number is larger than that in the 2 : 1 resonance, we obtained the chaotic streamlines in the whole flow region. The present study show that existence of the invariant tori and disruption by the resonances are generally observed in steady cavity flows in cavities with different aspect ratios and spanwise aspect ratios.

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  • Theory of global well-posedness on the nonlinear partial differential equations

    Grant number：20224013  2008 - 2012

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (S)

    KOZONO Hideo, YANAGIDA Eiji, ISHIGE Kazuhiro, NAKAMURA Makoto, KUBO Hideo, KANEDA Yukio, ISHIHARA Takashi, YOSHIMATSU Katsunori, KAGEI Yoshiyuki, EI Shinichro

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    Grant amount：\146120000 （ Direct expense: \112400000 、 Indirect expense：\33720000 ）

    We investigate the local existence of strong solutions and their blow-up within a finite time in arbitrary dimensional domains. The life-span of local solutions is characterized in terms of the L^1 and L^p-norms of the given initial data. Simultaneously, it is clarified that the total mass and the second momentum of the initial data together with the coefficient of the system of equations have a great influence on the blow-up phenomena. As an application, we prove that the blow-up solution either exhibits a definite blow-up rate determined by p, or oscillates in L^1 with the larger amplitude than the absolute constant. Furthermore, in multi-connected domains, it is still an open question whether there does exist a solution of the stationary Navier-Stoeks equations with the inhomogeneous boundary data whose total flux is zero. The relation between the nonlinear structure of the equations and the topological invariance of the domain plays an important role for the solvability of this problem. We prove that if the harmonic part of solenoidal extensions of the given boundary data associated with the second Betti number of the domain is orthogonal to non-trivial solutions of the Euler equations, then there exists a solution for any viscosity constant. The relation between Leary's inequality and the topological type of the domain is also clarified.

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  • Study of universality in turbulent flows at high Reynolds number from the view point of computational science

    Grant number：20340099  2008 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEDA Yukio, ISHII Katsuya, ISHIHARA Takashi, YOSHIMATSU Katsunori

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    Grant amount：\17160000 （ Direct expense: \13200000 、 Indirect expense：\3960000 ）

    The universality in the statistics of turbulent flows at high Reynolds number as well as the idea of the universality were examined on the basis of the analysis of the numerical data by large-scale direct numerical simulation. Particular attention was paid to (A) the universality inherent in the turbulence dynamics and (B) the universality of wall bounded turbulence. Study was also made on the method of coherent vortex simulation, which is based on the extraction of coherent vortices by the use of wavelet analysis and is expected to be useful for reducing the degrees of freedom to be treated in turbulence modeling.

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  • Development of the methods of large-scale, high-resolution direct numerical simulation of canonical problems of inhomogeneous turbulence

    Grant number：19560064  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Takashi, KANEDA Yukio, ISHII Katsuya, YOSHIMATSU Katsunori

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    Grant amount：\4550000 （ Direct expense: \3500000 、 Indirect expense：\1050000 ）

    カノニカルな非一様性乱流の高精度・高解像度な大規模直接数値計算(DNS)実現に向け、スペクトル法コードの高効率化、Sinc関数を用いた新DNS手法の開発、精度と効率の比較検討を実施した。その結果、新DNS手法では適当なパラメータ選択により高精度計算可能なこと、チャネル乱流ではスペクトル法と同程度であるが壁乱流や乱流混合層では従来手法より効率的に高精度大規模DNSが実現しうることなど、大規模DNS実現のための重要な知見を得た。

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  • New Development in Computational Physics of Turbulence

    Grant number：17340117  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEDA Yukio, ISHII Katsuya, ISHIHARA Takashi, YOSHIMATSU Katsunori, YOSHIDA Kyo

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    Grant amount：\15040000 （ Direct expense: \13900000 、 Indirect expense：\1140000 ）

    The achievements of this project include the following.
    1.Universality in the Statistics of Turbulence :
    (1) We studied the small scale statistics of turbulence by using the data of DNS with the world's highest resolution. The analysis showed that the DNS does not support assumptions commonly used in phenomenological theories of intermittency of turbulence.
    (2) An evidence supporting the Loitsyansky hypothesis on universality of large scale statistics in freely decaying turbulence was presented by DNS in a computation domain which is the largest in the DNSs so far made.
    2.Reduction of Information to be treated :
    (1) The analysis of the statistics of the energy transfer from large to small scales by using the data of 1-(1)clarified the dependence of the statistics on the method and scale of the coarse graining.-
    (2) The wavelet-analysis of the statistics of the coherent and incoherent modes of turbulence by using the data of 1-(1)showed that the ratio of the numbers of the coherent modes to that of the total modes decreases with the Reynolds number.
    3.Wall bounded turbulence :
    New numerical schemes for DNS of wall bounded turbulence were proposed, and compared with conventional ones. A scheme was shown to be promising in view of the accuracy and cost performance for DNS of boundary layer turbulence. The feasibility of -DNS of the inertial subrange in a turbulent channel flow was examined on the basis of our understanding of the physics.
    The achievements of 1 and 2 were possible only by DNS at the level of our study, and provide us with sound basis for developing turbulence theory and modeling. The finding in 3 should be useful for very large scale DNS of wall bounded turbulence. They contribute to the understanding of turbulence by computational approaches.

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  • Development of numerical-simulation method of high-Reynolds-number turbulence based on ultra-scale direct numerical simulations of turbulence

    Grant number：17560051  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Takashi, KANEDA Yukio, ISHII Katsuya, YOSHIMATSU Katsunori

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    Grant amount：\3500000 （ Direct expense: \3500000 ）

    Recently we performed ultra-scale direct numerical simulations (DNS's) of incompressible homogeneous isotropic turbulence on the Earth Simulator. The number of grid points is up to 4096^3, the size of which is 64 as large as previous DNS. The attained Taylor micro-scale Reynolds number is as high as 1200. We also performed large-scale DNS's of channel turbulence on the vpp5000/56 system of Information technology center at Nagoya University. In this study, for the purpose of developing numerical-simulation methods (modeling) of high-Reynolds turbulence, we have performed fundamental analyses of the large-scale DNS data of turbulence, have developed new methods of high-resolution DNS, and have tested large eddy simulation (LES) models of turbulence based on the high-resolution DNS's of turbulence.
    In the fundamental data analyses of turbulence, it is found that the energy transfer T across the wave number k is highly intermittent and the skewness Sand flatness F of T increase with k approximately in power laws in the inertial subrange. It is also found that (i) the singularity exponents a and b that characterize the intermittencies associated with the rate of energy dissipation and the enstrophy, respectively, agree well with each other in the inertial subrange, and (ii) the correlation coefficient between a and b is approximately 1.0 in the inertial subrange.
    In the development of high-resolution DNS method of turbulence, we have investigated the applicability of a Sinc-collocation method to the DNS of turbulent channel flow. It is shown that the method gives high accurate results provided that appropriate grid spacing is used. Our study suggests that the Sinc-collocation method can be a possible alternative of the Chebychev-tau method.
    In the test of LES models of turbulence, it is found that the optimal LES model for channel turbulence, which was proposed by Moser et al, shows a good performance near wall for large Reynolds number.

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  • Research on a highly accurate parallel numerical methods for fluid equations with portability

    Grant number：16605004  2004 - 2005

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHII Katsuya, KANEDA Yukio, HASEGAWA Akiumi, ISHIHARA Takashi, NAGI Toru

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    Grant amount：\3800000 （ Direct expense: \3800000 ）

    The purpose of this research in Computational Science is the development of the parallel computational environments for computational fluid dynamic research. Two objects have been investigated : 1)Numerical method of fluid phenomena with high accuracy and high resolution, 2)Robust computational environments using a JAVA language with portability. The following results are obtained.
    1)New three numerical schemes using combined compact difference schemes are proposed for incompressible and compressible fluid flows. These schemes are numerically stable and have high accuracy and resolution. We also investigate the numerically stable and high accurate boundary conditions for the combined compact difference schemes. The numerical results using these schemes are compared with those of the traditional numerical methods with a four times finer grid system.
    2)We developed two robust and flexible parallel systems for numerical simulations using the Java language which has fault tolerance for Grid Computing. In the first system, we adopt a master-worker model in order to settle the issue that usual programming is vulnerable to any kind of failure of the computing system. We have verified that the system integrity is nicely held as long as there is at least one worker process and that dynamic allocation of processes. The second computing system is applied to a network of a P2P type model and it is able to add and remove computing resources dynamically in this system. We implement this computing system in PC clusters and evaluate this system performance. This system is more robust and flexible than the first system but its computational speed is slow.
    These new numerical method and numerical environment will make it easy and flexible to simulate the accurate various flow phenomena with high accuracy and high resolution using a number of PCs.

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  • Development of a platform for analyses of ultra-scale direct numerical simulation data of turbulence

    Grant number：15607011  2003 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    ISHIHARA Takashi, KANEDA Yukio, ISHII Katsuya, YOSHIDA Kyo

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    Grant amount：\3600000 （ Direct expense: \3600000 ）

    We have performed ultra-scale direct numerical simulations(DNS) of incompressible homogeneous turbulence on the Earth Simulator. The number of grid points is up to 4096^3, the size of which is 64 as large as previous DNS. The attained Taylor micro-scale Reynolds number is as high as 1200. Since the ultra-scale DNS data of turbulence have a potential ability to elucidate high-Reynolds number turbulence, it is desirable to make the data public.
    In this research, for the purpose of developing a platform for analyses of the ultra-scale DNS data of turbulence, we have made the following studies :
    (1)We have released the fundamental characteristics as well as the results of various data-analyses of high-Reynolds number turbulence obtained by the ultra-scale DNS. The analyses include those of energy spectrum, pressure spectrum, enstrophy, and dissipation spectra, and the PDF and high-order moments of velocity derivatives in high Reynolds number turbulence. The findings are various new asymptotic properties of these quantities in high-Reynolds number turbulence.
    (2)We have developed general-purpose programs for the purpose of analyzing the ultra-scale DNS data of turbulence. The programs were written in FORTRAN and MPI. One can analyze the ultra-scale DNS data both on the ES and on the vpp5000/56 system of Information technology center at Nagoya University.
    (3)We have put the DNS data up to 1024^3 grid points on the Internet (one can download the data from the following URL : http://www.fluid.cse.nagoya-u.ac.jp/~dns/pub/dnsdata/dns.html). We have also made the 2048^3 DNS data available on Information technology center at Nagoya University.
    (4)We have succeeded on visualizing the ultra-scale turbulence field.
    (5)We have also performed a large-scale DNS of channel turbulence. The number of grid points is 1024x512x1024 and the attained friction Reynolds number Reτ is 1300.

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  • Analysis of Universal Structure and Development of Statistical Theory of Inhomogeneous Anisotropic Turbulence

    Grant number：14340033  2002 - 2004

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEDA Yukio, GOTOH Toshiyuki, ISHII Katsuya, ISHIHARA Takashi, YOSHIDA Kyo

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    Grant amount：\11000000 （ Direct expense: \11000000 ）

    The aim of this study is to understand the universal structure of turbulence, which is indispensable for developing statistical theory of inhomogeneous anisotropic turbulence. On the basis of the method of statistical theory of turbulence and large scale Direct Numerical Simulation(DNS), the study has clarified the followings :
    (A)DNS of Turbulence and Data-Analysis :
    By analyzing the data of the world largest DNS of turbulence with the number of grid points up to 4096^3, more than 10^11 degrees of freedom and 10^22 nonlinear interactions, we clarified some of (i)Reynolds(Re)-dependence of various statistics, and (ii)asymptotic universality in the high Re-limit. We also performed quantitative examination of (iii)Kolmogorov's similarity hypotheses, and (iv)the eddy-viscosity hypothesis in Large Eddy Simulation, at high Re.
    (B)Universal Structure and Modeling of Anisotropic Turbulence :
    We derived an expression for the anisotropic spectrum at small scales of homogeneous turbulent shear flow on the basis of the analysis of a Lagrangian spectral closure equation. We also derived a general expression for the anisotropic spectrum in stratified turbulence, confirmed its form by DNS, and showed the validity of an idea similar to that of the linear responses theory for non-equilibrium system.
    (C)DNS of Wall Bounded Turbulence and Data-Analysis :
    Plane Poiseuille turbulence is one of the most basic turbulences among boundary layer turbulences or turbulences with solid wall. In order to perform the DNS, we made codes based on the Chebyshev-tau method and a Combined Compact Scheme, respectively, and validated their performance. By the DNS, we clarified the dependence on the wall normal distance and Re of eddy-scale distribution, by analyzing the wall-normal velocity correlation spectrum.

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  • 乱流場の予測可能性

    Grant number：14654073  2002 - 2003

    日本学術振興会  科学研究費助成事業  萌芽研究

    金田 行雄, 後藤 俊幸, 吉田 恭, 石原 卓

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    Grant amount：\3100000 （ Direct expense: \3100000 ）

    巨大自由度が強く非線形相互作用する系である乱流においては、初期条件、境界条件、外力などの制御できない小さな誤差が時間とともに増大するため、長時間発展の予測は困難である、と考えられてきた。ところが、近年の低レイノルズ数乱流の数値実験において、大スケールの正確な情報が時々刻々与えれれば、小スケールの誤差がむしろ減少し、予測可能な時間が増えることが示唆された。
    そこで、本研究では、この数値実験を推し進め、前年(平成14年)度は、大規模直接数値シミュレーション(DNS)により、慣性小領域を持つ高レイノルズ数3次元乱流場の大スケールのデータ同化の実験を行い、小スケールの誤差を抑制するために必要なデータ同化量のレイノルズ数に依存しない定量的評価を得た。
    本年(平成15年)度は、前年度の数値実験の解析により、データ同化を行う最小スケールと誤差の減衰率との間の関係が、エネルギー散逸率と動粘性係数で決まる特徴的空間スケールと時間スケールによる規格化で、レイノルズ数に依存しなくなることを見出した。このことは、誤差の抑制機構がエネルギー散逸スケールの量で決まっていることを意味している。
    また、地球規模の流体運動は、鉛直方向のスケールが水平方向のスケールに比べて十分に小さいため、2次元流体の運動で近似される。本研究では、本年度2次元乱流においてもデータ同化の実験を行った。その結果、3次元乱流とは異なり、2次元乱流においては、(エンストロフィーの)散逸スケールではなくもっと大きいスケールのデータ同化だけで誤差が抑制されることが明らかになった。本結果は、地球規模流体運動の長時間予測においての、大スケールデータ同化の有効性を示唆するものである。

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  • 乱流の超大規模数値実験データベース公開方法の開発

    Grant number：13750059  2001 - 2002

    日本学術振興会  科学研究費助成事業  若手研究(B)

    石原 卓

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    Grant amount：\2200000 （ Direct expense: \2200000 ）

    乱流の直接数値シミュレーション(DNS)は、実験における測定誤差やデータの不確定性等の問題とは無縁の正確で詳細な乱流データを提供する。ただし、DNSにより微細な渦構造にいたる小スケールまで正しくシミュレートし、高レイノルズ数の乱流を実現することは、高速で大容量の計算機を必要とするため非常に困難であった。しかし、近年のスーパーコンピュータの目覚しい発達により数年前とはけた違いに巨大な自由度を高速に扱うことが可能となってきている。
    私は、日本学術振興会未来開拓学術研究推進事業「計算科学」プロジェクトの一つである「地球規模流動現象解明のための計算科学-数理・物理モデルと計算アルゴリズムの開発(研究代表者:金田行雄教授)」において、開発する乱流モデルの検証を行うため、大規模な乱流のDNS(格子点数1024の3乗)を実行し、乱流の大規模な基礎データの構築を行った。得られた乱流の大規模な基礎データを乱流研究者の間で有効に共有する方法を開発することを目的として、平成13年度には(1)必要とされるデータの調査、(2)データの試験的な共有、(3)データの可視化、(4)時系列の動画作成のための技術開発を行った。
    平成14年度は、上記(1)-(4)の知見と技術を用いてデータを整備し、Web (http://www.fluid.cse.nagoya-u.ac.jp/~ishihara/cgi-bin/dns.html)にて試験的なデータ公開を行った。また、名古屋大学と東北大学間のデータ転送の実験結果は、67MBの転送に75秒かかるというものであった。これにより1024の3乗の乱流速度場を完全に再現しうる必要最小限のデータ(8GB)を転送するのに約2時間半かかることが分かった。平成14年度はまた、地球シミュレータ(ES)のグループと協力し、ESを用いた世界最速の乱流DNS(格子点数2048の3乗、16.4TFlops)および、世界最大規模(格子点数4096の3乗)の乱流DNSを実現した。このけた違いに大規模な乱流のDNSデータの共有は、スーパーSINET上のGrid技術を用いることにより実現しうるという感触を得ることができた。

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  • Development of numerical schemes for the fluid flows with accurate boundary condition

    Grant number：10440028  1998 - 1999

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    ISHII Katsuya, OHARA Yoshio, ISHIHARA Takashi, KANEDA Yukio

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    Grant amount：\8500000 （ Direct expense: \8500000 ）

    The Purpose of this study is to develop high accurate numerical schemes for the fluid flow by using the accurate boundary conditions. For the simulation of the fluid flow, the adequate choice of numerical boundaries and/or interfaces is needed. We considered three numerical problems : (A) the fluid flow with three dimensional free surface or interface, (B) the boundary conditions of the vortical flow field interacting with acoustic waves, and (c) the boundary conditions of the vortical flow field interacting with acoustic waves. and (c) the boundary conditions for the scheme with accuracy and high resolutions. The results of the study are as follows :
    (1) The level set formulation for the interface of two-phase fluids is developed in the three-dimensional incompressible flow calculations, including large density and viscosity ratio as well as surface tension effects. Numerical simulations carried out for two rising gas bubbles, the interaction of buoyant drops with a fluid-fluid interface, and the propagation of surface waves. The results agree with previous experiment data, and make it possible to analyze the physical quantities near the boundaries.
    (2) Improving the boundary conditions for the vector velocity potential, we get the accurate numerical method for the localized vorticity fields. Using this method, the vortex sounds can be evaluated in the various flow fields, and the sound generation mechanism can be analyzed.
    (3) Using the no reflective boundary conditions, the acoustic control of flow separation at low Reynolds numbers are studied. We reproduced the phenomena that the tendency toward the separation on an airfoil is reduced by an acoustic excitation, and analyze the detailed flow field near the point of separation.
    (4) The combined compact scheme with high accuracy and high resolution is developed in the generalized grid system with concentrated points near the boundary. This scheme gives more accurate numerical results compared with the other finite difference methods.

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  • Development and verification of analytical and statistical theory of turbulence

    Grant number：09440076  1997 - 1998

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANEDA Yukio, ISHIHARA Takashi, GOTOH Toshiyuki, KOZONO Hideo, ISHII Katsuya

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    Grant amount：\7700000 （ Direct expense: \7700000 ）

    The purpose of this study is to develop analytical and statistical theories of turbulence that are practically applicable not only to isotropic, but also to anisotropic turbulence, and to verify them by numerical simulations.
    The results of the study include the followings :
    (1) An analytical and statistical theory is developed for turbulent diffusion in strongly stratified turbulence. It is based on a linearized approximation (Rapid Distortion Theory) and Corrsin's conjecture, and clarifies an mechanism of suppression of vertical turbulent diffusion by strong stratification. It is also shown that an anomalous turbulent diffusion that could not be explained by existing turbulence models, may occur in turbulence with a mean flow of simple shearing motion. These theoretical results were confirmed by numerical simulations.
    (2) By applying the Lagrangian Renormalized Approximation (LRA) , it is shown that a new kind of energy spectrum in two-dimensional turbulence may exist, which is not explained by the theory of Kraichnan-Batchelor-Leith (KBL) , but still exhibits the k^3 spectrum as predicted by KBL.By constructing a Lagrangian statistical theory for the beta-plane turbulence, which is a well known model for the fluid motion on a rotating sphere such as a planet, an analysis is made of the phase shift due to the interaction between waves and turbulence. The theoretical results were shown to be in good agreement with direct numerical simulations (DNS).
    (3) A new computational method is proposed for efficiently estimating Lagrangian two-time correlations that play the key roles in the study of mass and heat transfer in turbulence. The method uses Taylor expansions in powers of time and corresponding Pade approximations. It is shown thet the method works well and its results are in good agreement with DNS, not only for single but also two-particle correlation, and not only for isotropic but also anisotropic axisymmetric turbulence.

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  • 多次元領域における内部遷移層をもった定常解の存在と安定性について

    Grant number：08640261  1996

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    池田 榮雄, 石原 卓, 菊池 万里, 水野 透, 小林 久寿雄, 鈴木 正昭

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    Grant amount：\2000000 （ Direct expense: \2000000 ）

    二成分の反応拡散方程式系に対して、二次元以上の空間領域における内部遷移層を持つ定常解の存在と安定性について考察した。まず、空間二次元の全領域において回転対称な定常解に着目して、特異摂動法を利用して大きい解と小さい解の二種類を構成した。ワークステション等を使った数値実験によると、第一成分の時定数が比較的小さい時は大きい解は安全であるように見えるが、その時定数が大きくなるとこの定常解は不安定となり、あるモード数を持った新しい解が出現(分岐)する。また、定数定常解も存在し、これは時定数に関係なく安定である。SLEP法等を用いて線形化固有値問題を解析すると、小さい定常解は不安定であることは証明出来る。しかし、大きい解の安定性については完全には解決出来なかった。ある特定の大きさの固有値とあるタイプの固有関数に限定すれば、上記の数値実験の結果は正しいように思われる。すなわち、時定数が小さい時は限定された範囲で実部正の固有値は存在せず、時定数を減少させていくと、実固有値が虚軸を横切り、正固有値が出現する。
    これと平行して、従来の空間一次元問題に対する方法を利用するために、空間二次元の問題を空間一次元の問題で表現し(その代わり解くべき方程式の数は増加するが)、その近似がどれほど有効であるかを確かめた。具体的には、至る所神経繊維で覆われた心臓表面の神経パルスの伝播モデルに対して考察した。一次元的な平面波に関しては両者の結果は数学的に一致するが、スパイラルパターンに関しては、近似した方程式では安定に存在しないことを数値的に確認した。

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  • 2次元的渦面の運動の数値計算法の開発

    Grant number：07740149  1995

    日本学術振興会  科学研究費助成事業  奨励研究(A)

    石原 卓

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    Grant amount：\900000 （ Direct expense: \900000 ）

    本年度の研究「3次元的渦面の運動の数値計算法の開発」では、渦面の3次元運動において現れる特異性を解明するために数値計算法の精度を高めること、及び大規模数値計算に備えて計算の高速化を行うことが目的であった。研究により得られた知見は以下の通りである。
    1、(計算精度について)前年度までの数値計算法においては、計算の便宜上、スムージングパラメタを導入していた。渦面に現れる特異性を調べるためには非常に細かいスケールの分解能が要求され、上記パラメタの導入がその妨げになっていた。本年度の研究では、数値計算法の細部の見直し(微分演算をFFTを用いて求める等)による計算精度の向上、及びKrasny(1986)の技巧の適用により、上記スムージングパラメタをゼロとした計算が渦面の3次元運動に対しても可能であることが判明した。
    2、(渦面に現れる特異性について)1により数値計算結果の弱非線形解析結果Ishihara & Kaneda(1994)との定量的比較が可能になった。数値計算結果は解析結果と定量的にも矛盾しないものであった。また、Ishihara & Kaneda(1995)では渦面に現れる特異性について幾つかの解釈が可能であることが判明したが、数値計算によりその解釈の断定が行えた。(この結果、国際会議「SECOND INTERNATIONAL WORKSHOP ON VORTEX FLOWS AND RELATED NUMERICAL METHODS(MONTREAL,CANADA,1995)」において発表した。)
    3、(計算の高速化について)渦面の2次元運動の数値計算において「fast multipole method」の可能性を調べた。実際、高速化に対し有効であることが分かったが、計算の精度との間にトレードオフの関係があり、計算精度の要求される「特異性の解明のための数値計算」には応用困難であった。ただ、大規模数値計算には非常に有効であるという感触を得たので、計算の並列化等の今後も引き続き行う予定である。

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  • Laboratory Work for Graduation Thesis (Research in Topics of Information) （2021academic year） 1st-4th semester  - その他

  • Numerical Simulation II-1 （2021academic year） Third semester  - 火5～6

  • Numerical Simulation II-2 （2021academic year） Fourth semester  - 火5～6

  • Numerical Simulation I （2021academic year） 1st and 2nd semester  - 火3～4

  • Numerical Simulation I-1 （2021academic year） 1st semester  - 火3～4

  • Numerical Simulation I-2 （2021academic year） Second semester  - 火3～4

  • Numerical Simulation II （2021academic year） 3rd and 4th semester  - 火5～6

  • Glance at Mathematical Science A （2021academic year） Second semester  - 金5～6

  • Special Research （2021academic year） Year-round  - その他

  • Seminar on Numerical Analysis of Flow Phenomena （2021academic year） Prophase  - その他

  • Seminar in Numerical Analysis of Flow Phenomena （2021academic year） Late  - その他

  • Seminar on Numerical Analysis of Flow Phenomena （2021academic year） Late  - その他

  • Seminar in Numerical Analysis of Flow Phenomena （2021academic year） Prophase  - その他

  • Internship for Department of Environmental and Mathematical Science(Short term) （2021academic year） special  - その他

  • Internship for Department of Environmental and Mathematical Science(Long term) （2021academic year） special  - その他

  • Advanced Computational Science （2021academic year） Prophase  - その他

  • Seminar on Computational Science （2020academic year） Third semester  - 月7,月8

  • Programming Language B-1 （2020academic year） Third semester  - 月4,月5

  • Programming Language B-2 （2020academic year） Fourth semester  - 月4,月5

  • Programming Language Ⅱ （2020academic year） 3rd and 4th semester  - 月4,月5

  • Large Scale Numerical Simulations （2020academic year） Prophase  - 木2,木3

  • Foundation of Geometry （2020academic year） 3rd and 4th semester  - [第３学期]木1,木2, [第４学期]木2,木3

  • Foundation of Geometry A （2020academic year） Third semester  - 木1,木2

  • Foundation of Geometry B （2020academic year） Fourth semester  - 木2,木3

  • Seminar on Applied Numerical Analysis （2020academic year） Prophase  - その他

  • Seminar in Applied Numerical Analysis （2020academic year） Late  - その他

  • Seminar on Applied Numerical Analysis （2020academic year） Late  - その他

  • Seminar in Applied Numerical Analysis （2020academic year） Prophase  - その他

  • Numerical Simulation II-1 （2020academic year） Third semester  - 火6,火7

  • Numerical Simulation II-2 （2020academic year） Fourth semester  - 火6,火7

  • Numerical Simulation I （2020academic year） 1st and 2nd semester  - 火2,火3

  • Numerical Simulation I-1 （2020academic year） 1st semester  - 火2,火3

  • Numerical Simulation I-2 （2020academic year） Second semester  - 火2,火3

  • Numerical Simulation II （2020academic year） 3rd and 4th semester  - 火6,火7

  • Glance at Mathematical Science A （2020academic year） Second semester  - 金5,金6

  • Special Research （2020academic year） Year-round  - その他

  • Present Environmental Problems, Science and Technology （2020academic year） Fourth semester  - 木5,木6

  • Topics in Mathematical Modeling for Environmental Science B （2020academic year） Third semester  - その他

  • Topics in Mathematical Modeling for Environmental Science B （2020academic year） Third semester  - その他

  • Linear Algebra II-1 （2020academic year） Third semester  - 金4,金5

  • Linear Algebra II-1 Exercise （2020academic year） Third semester  - 金6,金7

  • Linear Algebra II-2 （2020academic year） Fourth semester  - 金4,金5

  • Linear Algebra II-2 Exercise （2020academic year） Fourth semester  - 金6,金7

  • Linear Algebra III-1 （2020academic year） Third semester  - 金1,金2

  • Linear Algebra III-2 （2020academic year） Fourth semester  - 金1,金2

  • Linear Algebra III （2020academic year） 3rd and 4th semester  - 金1,金2

  • Advanced Computational Science （2020academic year） special  - その他

  • Seminar on Computational Science （2020academic year） Third semester  - 月7,月8

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