Updated on 2022/07/02

写真a

 
Suzuki Hiroki
 
Organization
Faculty of Natural Science and Technology Associate Professor
Position
Associate Professor
External link

Degree

  • Ph.D ( Nagoya University )

Research Interests

  • Fluid Mechanics

  • Turbulent flows

  • Fluid Dynamics

  • Computational Fluid Dynamics

Research Areas

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

Education

  • Nagoya University   大学院工学研究科  

    2006.4 - 2010.3

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Research History

  • Okayama University   The Graduate School of Natural Science and Technology   Associate Professor

    2021.4

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  • Water Engineering Group, School of Architecture, Building and Civil Engineering, Loughborough Univerisy   Academic Visitor

    2019.3 - 2019.8

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  • Yamaguchi University   Graduate School of Sciences and Technology for Innovation   Assistant Professor

    2016.4 - 2021.3

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  • Yamaguchi University   Graduate School of Sciences and Engineering   Assistant Professor

    2015.4 - 2016.3

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  • Nagoya Institute of Technology   Graduate School of Engineering   Assistant Professor

    2011.11 - 2015.3

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  • Japan Society for Promotion of Science   Research Fellowships for Young Scientists (PD)

    2011.4 - 2011.10

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  • Laboratoire de Mécanique des Fluides et d'Acoustique, Ecole Central de Lyon   Visiting Researcher

    2010.7 - 2011.3

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  • Japan Society for Promotion of Science   Research Fellowships for Young Scientists (PD)

    2010.4 - 2011.3

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  • Japan Society for Promotion of Science   Research Fellowships for Young Scientists (DC1)

    2008.4 - 2010.3

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Professional Memberships

  • Japan Society of Fluid Mechanics

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  • Japan Society of Mechanical Engineering

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Committee Memberships

  • 日本流体力学会 中四国・九州支部   幹事  

    2022.4   

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  • Japan Society of Fluid Mechanics   Daigiin  

    2021.4 - 2023.3   

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  • Japan Society of Fluid Mechanics   Fluid Mechanics 2030 WG Committee member  

    2019.10 - 2021.12   

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  • Executive Committee for Annual Conference of Japan Society of Fluid Mechanics   幹事(学会運営全般)  

    2019 - 2020   

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    Committee type:Academic society

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  • 日本機械学会 中国四国支部 第57期総会・講演会 実行委員会   委員  

    2018 - 2019   

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    Committee type:Academic society

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  • The 7th Joint Conference on Renewable Energy and Nanotechnology   Executive committee member  

    2018   

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  • International Conference on Innovative Application Research and Education (ICIARE2017)   Execution Committee  

    2017   

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  • 日本機械学会 第94期流体工学部門講演会   幹事(筆頭)  

    2016.1 - 2016.12   

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  • 日本流体力学会中部支部   運営委員  

    2012.4 - 2015.3   

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  • 日本機械学会東海支部第61期総会・講演会   実行委員  

    2011.12 - 2012.3   

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Papers

  • Numerical-Based Theoretical Analysis on Effects of Weak Fluid Acceleration of Free-Stream due to Wind-Tunnel Blockage on Grid-Generated Turbulence Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

    Flow Measurement and Instrumentation   62   1 - 8   2018.6

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  • Simplified Equations for Rotational Speed Responding to Inflow Velocity Variation in Fixed-Pitch Small Wind Turbines Reviewed

    Hiroki Suzuki, Yutaka Hasegawa

    Fluid Dynamics Research   47   015510 - (22 pages)   2015.1

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  • Direct Numerical Simulation of Fractal-Generated Turbulence Reviewed

    Hiroki Suzuki, Koji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

    Fluid Dynamics Research   45 ( 6 )   061409 - (23 pages)   2013.12

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  • An Attempt to Improve Accuracy of Higher-Order Statistics and Spectra in Direct Numerical Simulation of Incompressible Wall Turbulence by Using the Compact Schemes for Viscous Terms Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

    International Journal for Numerical Methods in Fluids   73 ( 6 )   509 - 522   2013.10

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  • High-Schmidt-number scalar transfer in regular and fractal grid turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Ryota Ukai

    Physica Scripta   T142 ( T142 )   014069 - (6 pages)   2010.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    Turbulent mixing of high-Schmidt-number passive scalars in regular and fractal grid turbulence is experimentally investigated using a water channel. A turbulence-generating grid is installed at the entrance of the test section, which is 1.5 m in length and 0.1 m x 0.1 m in cross section. Two types of grids are used: one is a regular grid consisting of square-mesh and biplane constructions, and the other is a square-type fractal grid, which was first investigated by Hurst and Vassilicos (2007 Phys. Fluids 19 035103) and Seoud and Vassilicos (2007 Phys. Fluids 19 105108). The two grids have the same solidity of 0.36. The Reynolds number based on the mesh size, Re(M) = U(0)M(eff)/nu, is 2500 in both flows, where U(0) is the cross-sectionally averaged mean velocity, M(eff) is the effective mesh size and nu is the kinematic viscosity. A fluorescent dye (rhodamine B) is homogeneously premixed only in the lower stream and therefore the scalar mixing layers with an initial step profile develop downstream of the grids. The Schmidt number of the dye is O(10(3)). The time-resolved particle image velocimetry and the planar laser-induced fluorescence techniques are used to measure the velocity and concentration fields. The results show that the turbulent mixing in fractal grid turbulence is more strongly enhanced than that in regular grid turbulence for the same mesh Reynolds number ReM. The profile of instantaneous scalar dissipation shows that scalar dissipation takes place locally even in the far downstream region at x/M(eff) = 120 in fractal grid turbulence.

    DOI: 10.1088/0031-8949/2010/T142/014069

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  • Impact of the kinetic energy conservation on unsteady homogeneous turbulence Reviewed

    Shinnosuke Nakamura, Hiroki Suzuki, Shinsuke Mochizuki

    (全文査読付) Proceedings of the 7th International Conference on Jets, Wakes and Separated Flows 2022 (ICJWSF2022)   paper No. ICJWSF2022-B01 - (8 pages)   2022.3

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  • Numerical-model-based experiment for estimating effects of local weak mean acceleration on the decaying multiscale-generated turbulence Reviewed

    Hiroki Suzuki, Hiroto Yamaguchi, Kento Tanaka, Toshinori Kouchi

    (全文査読付) Proceedings of the 32nd International Symposium on Transport Phenomena (ISTP32)   paper No. 22 - (5 pages)   2022.3

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  • Impact of Pitot tube diameter on the centre line mean flow velocity in multi-scale grid-generated turbulence Reviewed

    Hiroto Yamaguchi, Hiroki Suzuki, Kento Tanaka, Toshinori Kouchi

    Journal of Physics: Conference Series   (7 pages) - accepted   2022

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  • Validation on the mean friction velocity of an atmospheric boundary layer flow reproduced by large-eddy simulation in terms of kinetic energy conservation Reviewed

    Hiroki Suzuki, Yutaka Hasegawa

    Journal of Physics: Conference Series   (11 pages) - accepted   2022

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  • Numerical visualisation on applying a five-stage multi-scaled square turbulence-generating grid to generating turbulence Reviewed

    Hiroki Suzuki

    Journal of Physics: Conference Series   (10 pages) - accepted   2022

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  • Development of a single-scale initial flow field into steady homogeneous turbulence with validating a constructed Fourier spectral analysis Reviewed

    Hiroki Suzuki, Toshinori Kouchi

    Journal of Physics: Conference Series   (16 pages) - accepted   2022

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  • Uncertainty evaluation due to the difference in definitions of the acceleration parameter to examine the influence of mean flow acceleration on the experimental turbulent flows Reviewed

    Takanari Kashiwagi, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   (10 pages) - accepted   2022

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  • 二次元チャネル乱流の壁面せん断応力に対するLEBUの効果 Reviewed

    望月信介, 亀田孝嗣, 鈴木博貴

    日本機械学会論文集   (早期公開)   22-00059 - (11 pages)   2022

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  • Impact of difference between explicit and implicit second-order time integration schemes on isotropic/anisotropic steady incompressible turbulence field Reviewed

    Ryuma Honda, Hiroki Suzuki, Shimsuke Mochizuki

    Journal of Physics: Conference Series   2090   012145 - (8 pages)   2021.12

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    DOI: 10.1088/1742-6596/2090/1/012145

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  • Attempt to quantify the impact of seasonal air density variation on operating tip-speed ratio of small wind turbines Reviewed

    Hiroki Suzuki, Yutaka Hasegawa, Oluwasola Afolabi, Shinsuke Mochizuki

    Journal of Physics: Conference Series   2090   012144 - (8 pages)   2021.12

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    DOI: 10.1088/1742-6596/2090/1/012144

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  • Simplified numerical modeling of rotational speed response for a small wind turbine Reviewed

    Hiroki Suzuki, Yutaka Hasegawa, Shinsuke Mochizuki

    (全文査読付) Proceedings of the International Conference on Power Engineering 2021 (ICOPE-2021)   paper No.0130 - (4 pages)   2021.10

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    DOI: 10.1299/jsmeicope.2021.15.2021-0130

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  • Numerical simulation of viscosity/implicit large-eddy steady turbulence with the Reynolds number dependency Reviewed

    Naoyuki Iwata, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   2047   012007 - (7 pages)   2021.10

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    DOI: 10.1088/1742-6596/2047/1/012007

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  • Effects of spatial resolution anisotropy on viscous terms using isotropic steady turbulence numerical analysis Reviewed

    Riku Hirabayashi, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   2047   012008 - (7 pages)   2021.10

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    DOI: 10.1088/1742-6596/2047/1/012008

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  • Effect of the kinetic energy conservation error on unsteady/steady isotropic turbulence: a numerical simulation study Reviewed

    Shinnosuke Nakamura, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   2047   (8 pages) - 012009   2021.10

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    DOI: 10.1088/1742-6596/2047/1/012009

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  • Visualization of intermittency of low-Reynolds-number anisotropic steady incompressible turbulence using implicit/SGS-model-based large-eddy simulation Reviewed

    Journal of Physics: Conferense Series   1983   012041 - (8 pages)   2021.8

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  • Time-series observation of the effects of kinetic energy conservation error on isotropic and anisotropic steady incompressible turbulence Reviewed

    Journal of Physics: Conference Series   1978   012026 - (7 pages)   2021.7

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  • Scalar structures around the mixing interface of a thermal mixing layer in multiscale-generated decaying turbulent flows visualized using DNS database Reviewed

    Journal of Physics: Conference Series   1978   012012 - (7 pages)   2021.7

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  • Reynolds Number Dependency of Small Scale Structures in Steady Anisotropic Turbulence Produced by Implicit Large-Eddy Simulation Reviewed

    Mayuka Oshibuchi, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1978   012021 - (8 pages)   2021.7

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  • Autocorrelation Function for Estimating Static Pressure Fluctuation Intensity in Incompressible Homogeneous Turbulence under an Intermediate Reynolds Number Reviewed

    Journal of Physics: Conference Series   1978   012002 - (8 pages)   2021.7

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    DOI: 10.1088/1742-6596/1978/1/012002

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  • An experimental study on the equilibrium boundary layer subjected to favourable pressure gradient (Effect of pressure gradient on law of the wall) Reviewed

    Yudai Hikita, Hiroki Suzuki, Takatsugu Kameda, Shinsuke Mochizuki

    Transactions of the JSME   87 ( 894 )   20-00394 - 00394   2021.1

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

    DOI: 10.1299/transjsme.20-00394

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  • Reduced Conservation Error of Kinetic Energy using a Runge-Kutta Algorithm with Reduced Numerical Dissipation Reviewed

    Hiroki Suzuki, Koudai Hasebe, Yutaka Hasegawa, Tatsuo Ushijima

    Journal of Physics: Conference Series   1633   012021 - (9 pages)   2020.9

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    DOI: 10.1088/1742-6596/1633/1/012021

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1633/1/012021

  • Simple Scheme generating an Axisymmetrically Anisotropic Initial Flow of Incompressible Turbulence using a Normal Random Number Vector Reviewed

    Hiroki Suzuki, Koudai Hasebe, Yutaka Hasegawa, Tatsuo Ushijima, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1592   012004 - (8 pages)   2020.9

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  • Second-Order Kinetic Energy-Conservative Analysis of Incompressible Turbulence under a Collocated Grid System Reviewed

    Hiroki Suzuki, Yutaka Hasegawa, Masaya Watanabe, Tatsuo Ushijima, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1633   012063 - (9 pages)   2020.9

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    DOI: 10.1088/1742-6596/1633/1/012063

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1633/1/012063

  • Small Transparent Prism for the Cross-Sectional Visualization for a Turbulent Scalar Mixing Layer using a Water-Channel PLIF Method Reviewed

    Ryota Ukai, Hiroki Suzuki, Shinsuke Mochizuki, Yasuhiko Sakai

    Journal of Physics: Conference Series   1592   012001 - (7 pages)   2020.9

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  • Verification of the Numerical Analysis Using a Collocated Grid System Directly Solving the Quasi-Inviscid Incompressible Flow around a Symmetric Airfoil Reviewed

    Hiroki Suzuki, Masaya Watanabe, Yutaka Hasegawa, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1633   012028 - (10 pages)   2020.9

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    DOI: 10.1088/1742-6596/1633/1/012028

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1633/1/012028

  • Influence of Order Enhancement of the Runge-Kutta Method on Low-order Turbulence Statistics of Incompressible Wall Turbulence under a Second-order Central Difference Scheme Reviewed

    Shotaro Jomura, Hiroki Suzuki, Yutaka Hasegawa, Shinnosuke Matsuo, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1592   012095 - (9 pages)   2020.9

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  • Quasi-Analytical Solutions of a Turbulence-Modeling Equation on the Robustness of Decaying Homogeneous Turbulence Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

    Advances in Mechanical Engineering   12 ( 2 )   1 - 13   2020.2

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  • Monte-Carlo Simulation Study for Uncertainty Evaluation in Turbulent Statistics Obtained by Constant-Temperature Anemometry Reviewed

    Kenji Fujita, Hiroki Suzuki, Shinsuke Mochizuki

    Journal of Physics: Conference Series   1324   012068 - (8 pages)   2019.10

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    DOI: 10.1088/1742-6596/1324/1/012068

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1324/1/012068

  • Simple Analytical Solutions of One-Equation Modelling for Steady/Decaying Homogeneous Turbulence sensitized to Small Strain Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

    Journal of Physics: Conference Series   1324   012063 - (8 pages)   2019.10

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    DOI: 10.1088/1742-6596/1324/1/012063

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1324/1/012063

  • Simple Mean-Error Estimation of a Recalibration Scheme for Constant-Temperature Anemometry Measurements Reviewed

    Hiroki Suzuki, Yoshiaki Shikata, Shinsuke Mochizuki, Yutaka Hasegawa

    Journal of Physics: Conference Series   1324   012062 - (7 pages)   2019.10

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    DOI: 10.1088/1742-6596/1324/1/012062

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    Other Link: https://iopscience.iop.org/article/10.1088/1742-6596/1324/1/012062

  • Numerical Study on the Low Reynolds Number Steady Incompressible Turbulence due to Isotropic/Anisotropic Forcing Reviewed

    Shotaro Jomura, Hiroki Suzuki, Shinsuke Mochizuki

    Proceedings of the 7th Joint Conference on Renewable Energy and Nanotechnology (JCREN2018)   Paper IN_02 - (4 pages)   2018.12

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  • Turbulence-Model Validation of Wind-Tunnel-Blockage Effects on the Grid-Generated Turbulence Reviewed

    Naru Itamura, Hiroki Suzuki, Shinsuke Mochizuki

    Proceedings of the 7th Joint Conference on Renewable Energy and Nanotechnology (JCREN2018)   Paper IN_03 - (4 pages)   2018.12

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  • Energy Transport Mechanisms in the Outer Layer of the Turbulent Boundary Layer Subjected to Favourable Pressure Gradient Reviewed

    Suyako Mizukami, Hiroki Suzuki, Shinsuke Mochizuki

    Proceedings of the 7th Joint Conference on Renewable Energy and Nanotechnology (JCREN2018)   Paper IN_04 - (4 pages)   2018.12

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  • Numerical Simulation Study on the Incompressible Decaying Turbulent Flows Affected by the Divergence of the Viscous Terms Reviewed

    Kazunobu Nomura, Hiroki Suzuki, Shinsuke Mochizuki

    Proceedings of the 7th Joint Conference on Renewable Energy and Nanotechnology (JCREN2018)   Paper IN_01 - (4 pages)   2018.12

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  • Numerical-Based Theoretical Analysis on the Decay of Homogeneous Turbulence affected by Small Strain based on Constant and Linear Strain Variations Reviewed

    Hiroki Suzuki, Kenji Fujita, Shinsuke Mochizuki, Yutaka Hasegawa

    Journal of Physics: Conference Series   1053   012039 - (7 pages)   2018.8

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  • Numerical Investigation on the Sensitivity of Turbulence Statistics to Small Velocity Variations in Grid-Generated Turbulence based on k-ε model Reviewed

    Yoshiaki Shikata, Hiroki Suzuki, Shinsuke Mochizuki

    Advanced Experimental Mechanics   3   78 - 85   2018.8

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  • Shear stress vector measurement using a circular sublayer plate with multiple pressure taps Reviewed

    Dan Hua, Hiroki Suzuki, Shinsuke Mochizuki

    AIAA Journal   56 ( 6 )   2138 - 2144   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Institute of Aeronautics and Astronautics Inc.  

    A local wall shear-stress vector measurement technique has been developed using a thin circular plate, referred to as a sublayer plate, which is attached to the wallin the sublayer of a near-wall turbulent flow. The pressure difference between the leading and trailing edges of the plate is correlated to the known wall shear stress obtained in the fully developed turbulent channel flow. A circular sublayer plate surrounded by eight pressure taps is designed to measure the wall shear-stress vector. The curvature of the round edge of the circular plate slightly reduces the sensitivity to the wall shear-stress magnitude in comparison with a rectangular plate. The circular plate can successfully detect the flow direction over a wide-range flow angle. The circular plate with eight pressure taps has a higher resolution in the measurement of the wall shear vector for a small angle of attack using the ratio of the pressure differences at two taps adjacent to the tap showing the maximum stagnation pressure.

    DOI: 10.2514/1.J056794

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  • Local Wall Shear Stress Measurement with a Rectangular Plate Submerged in the Sublayer Reviewed

    Hua Dan, Hiroki Suzuki, Shinsuke Mochizuki

    Extended Abstracts of the Ninth JSME-KSME Thermal and Fluids Engineering Conference   TFEC9-1021 - (5 pages)   2017.10

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  • Local Wall Shear Stress Measurements with a Thin Plate Submerged in the Sublayer in Wall Turbulent Flows Reviewed

    Hua Dan, Hiroki Suzuki, Shinsuke Mochizuki

    Experiments in Fluids   58   124 - (11 pages)   2017.8

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  • Validation Scheme for Effects of Wind-tunnel Blockage for Spatially Varying Acceleration Parameter Reviewed

    Hiroki Suzuki, Kenji Fujita, Shinsuke Mochizuki

    Advanced Experimental Mechanics   2   53 - 58   2017.8

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  • Numerical investigation using an exact solution of the effects of non-solenoidality of the viscous terms on the incompressible flow Reviewed

    Hiroki Suzuki, Shingo Hattori, Shinsuke Mochizuki

    Journal of Fluid Science and Technology   12 ( 1 )   16-00257 - (13 pages)   2017

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Society of Mechanical Engineers  

    We examine effects of the divergence of the viscous terms on the numerical results of an incompressible flow by using an exact solution of the governing equation. When the Poisson equation is solved using fractional steps, the divergence in the velocity field may have nonzero magnitude. It should be noted that the divergence of the viscous terms can be larger than that of the velocity field. We use an exact solution, which is commonly used for benchmarking, to examine the effects of the divergence of the viscous terms. The divergence of the viscous terms affects the equilibrium relations found in the exact solution. In the present numerical results, the divergence of the viscous terms reduces the rate of decay of the kinetic energy and the pressure, and it also causes some harmonic waves in the flow field. We examine these results quantitatively by using approximations to the numerical results. Skewness and kurtosis factors of the physical quantities are also affected by the divergence of the viscous terms. These results show that the divergence of the viscous terms significantly affects the flow field.

    DOI: 10.1299/jfst.2017jfst0001

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  • Simple Model of Decay of Homogeneous Turbulence Affected by Weak Fluid Acceleration Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki

    Proceedings of the 20th Australasian Fluid Mechanics Conference   Paper No.411 - (4 pages)   2016.12

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  • Basis Study on the Output-Voltage Variation of Constant-Temperature Anemometry at Freestream Velocity Reviewed

    Hiroki Suzuki, Shingo Hattori, Shinsuke Mochizuki, Yutaka Hasegawa

    Advanced Experimental Mechanics   1   36 - 41   2016.8

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  • Effect of Fluid Acceleration due to Area Reduction of a Wind Tunnel on Temporally and Spatially Decaying Grid Turbulence Reviewed

    Hiroki Suzuki, Shinnosuke Matsuo, Shinsuke Mochizuki, Yutaka Hasegawa

    Advanced Experimental Mechanics   1   15 - 22   2016.8

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  • Validation Scheme for Small Effect of Wind Tunnel Blockage on Decaying Grid-Generated Turbulence Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

    Journal of Fluid Science and Technology   11 ( 3 )   16-00195 - (13 pages)   2016.7

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  • Wall Similarity in Turbulent Boundary Layers Subjected to Weak Pressure Gradients Reviewed

    Shinsuke Mochizuki, Hiroki Suzuki, Hitoshi Tokunaga, Takatsugu Kameda

    Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015)   185 ( 1 )   317 - 324   2016

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:SPRINGER INT PUBLISHING AG  

    In this study, the effects of adverse and favorable pressure gradients on the law of the wall were investigated experimentally in turbulent boundary layers. The divergence and convergence of the mean streamline in the wall layer are considered to yield suitable velocity scales in the wall layer by integrating the equations of motion at finite Reynolds number.

    DOI: 10.1007/978-3-319-30602-5_40

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  • Research of Electric Power Regeneration using Automotive Cooling Fan (Improvement of Fan Efficiency by Diffuser) Reviewed

    Yoshitaka Wagayama, Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the International Symposium on EcoTopia Science 2015   Paper No. 1035 - (1 page)   2015.12

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  • Study on Pitch Motion Optimization of Wing-Stroke Wind Turbine Reviewed

    Hironori Nakano, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the International Symposium on EcoTopia Science 2015   Paper No. 1028 - (1 page)   2015.12

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  • A Small Wind Tunnel with Lower Fluid Acceleration Reviewed

    Shinnosuke Matsuo, Hiroki Suzuki, Yutaka Hasegawa, Tatsuo Ushijima, Shinsuke Mochizuki

    Proceedings of the 10th International Symposium on Advanced Science and Technology in Experimental Mechanics   Paper No.A111 - (6 pages)   2015.11

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  • Fundamental Study on the Temporal Variation of CTA Calibration Curves Reviewed

    Hiroki Suzuki, Shinsuke Mochizuki, Yutaka Hasegawa

    Proceedings of the 10th International Symposium on Advanced Science and Technology in Experimental Mechanics   Paper No.A112 - (6 pages)   2015.11

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  • Research of electric power regeneration using automotive cooling fan (Influence of wind turbine on air resistance through vehicle cooling system) Reviewed

    Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima, Hideki Ooya

    Transactions of the JSME (in Japanese)   81 ( 830 )   14-00169 - (16 pages)   2015.9

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  • Research of electric power regeneration using automotive cooling fan (Enhancement of wind turbine power by installing high solidity rotor on vehicle) Reviewed

    Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima, Hideki Ooya

    Transactions of the JSME (in Japanese)   81 ( 829 )   15-00042 - (12 pages)   2015.8

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  • Research of electric power regeneration using automotive cooling fan (Improvement of wind turbine efficiency by high solidity rotor) Reviewed

    Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

    Transactions of the JSME (in Japanese)   81 ( 827 )   15-00069   2015.7

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  • Development of a PIV System and a Measurement of Grid-Generated Turbulence

    SUZUKI Hiroki, NAGATA Koji, SAKAI Yasuhiko

    Journal of the Visualization Society of Japan   35 ( 139 )   29 - 34   2015

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    We develop a PIV system and validate it by measuring a grid-generated turbulence. We first show the background of this research before we approach the development of the system, and then, we describe the newly developed PIV system. We also describe an interpolation method, which we introduce into the PIV system, which notably decreases the uncertainty of PIV measurement. Then, we apply the PIV system to measurement of a grid-generated turbulent flow, and validate the PIV system by measuring the flow. First, an instantaneous flow field and basic characteristics of the flow are shown. Then, the energy decay of velocity fluctuation in the flow is shown, and coefficients of the decay law of the intensity are measured. Measuring the energy dissipation of the flow, we measure the value of these coefficients. The agreement of these coefficient values with those of previous experiments validates the PIV measurement.

    DOI: 10.3154/jvs.35.139_29

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  • On Deviation of Operated Tip Speed Ratio of Small Wind Turbine due to Effect of Air Density Variation Reviewed

    Hiroki Suzuki, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of National Symposium on Wind Engineering   23   103 - 108   2014.12

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  • Research of electric power regeneration using automotive cooling fan (Improvement of wind turbine efficiency by changing blade profile) Reviewed

    Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo UshijimaSHIJIMA

    Transactions of the JSME (in Japanese)   80 ( 819 )   FE0315 - (11 pages)   2014.12

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  • Improvement of Rotor Configuration for Achievement of Automotive Fan-Turbine System Reviewed

    Shinichi Oda, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition   Paper No. O-Wd-15-2 - (4 pages)   2014.7

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  • A 3D Navier-Stokes Simulation under Staggered/Collocated Grids with High-Kinetic-Energy-Conservation Reviewed

    Hiroki Suzuki, Shinnosuke Matsuo, Masaya Watanabe, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition   Paper No. P-Wd-2-22 - (3 pages)   2014.7

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  • Effects of Blade Aspect Ratio on Aerodynamic Performance of Turbine Blade in Wing-Stroke Motion Reviewed

    Hironori Nakano, Noriyuki Tanimura, Yutaka Hasegawa, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition   Paper No. P-Wd-1-33 - (4 pages)   2014.7

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  • Study of Tower Effects on Rotor Characteristics of Horizontal Axis Wind Turbine Reviewed

    Noriyuki Tanimura, Yutaka Hasegawa, Hiroki Suzuki, Fumiya Hara, Tatsuo Ushijima

    Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition   Paper No. P-Wd-1-22 - (4 pages)   2014.7

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  • Development and Application of a Navier-Stokes Simulation Code with High- Kinetic-Energy-Conservation Reviewed

    Hiroki Suzuki, Shinnosuke Matsuo, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of the Grand Renewable Energy 2014 International Conference and Exhibition   Paper No. O-Wd-1-2 - (3 pages)   2014.7

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  • A study on effects of temporally varying/ fluctuating noises on statistical profiles measured by means of PLIF method (Development of prediction formulas of the effects, and validation by high-Sc-number scalar mixing layer in grid turbulence) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Yutaka Hasegawa, Tatsuo Ushijima

    Transactions of the JSME (in Japanese)   80 ( 813 )   FE0114   2014.5

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  • Development of turbulence behind the single square grid Reviewed

    Yi Zhou, Kouji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Yasumasa Ito, Osamu Terashima, Toshiyuki Hayase

    Physics of Fluids   26 ( 4 )   045102 - (17 pages)   2014.4

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    In this paper, direct numerical simulations are carried out to study single-square grid-generated turbulence at a Reynolds number Re-L0 = 20 000 (based on the inlet velocity U-in and the length of grid bar L-0). Different from the regular grid and the multiscale/fractal grid, here only single large square grid is placed at the center near the inlet. First, we investigate the evolutions of turbulence characteristics (e.g., mean streamwise velocity, turbulence intensity, Taylor microscale, etc.) along the centerline. The common characteristics possessed by turbulent flows generated by the single square grid and by the fractal square grid are presented. We confirm the hypothesis proposed by Mazellier and Vassilicos ["Turbulence without Richardson-Kolmogorov cascade," Phys. Fluids 22, 075101 (2010)] that for the fractal square grid, the location of turbulence intensity peak along the centerline is mainly determined by large-scale wake interactions. Current numerical results show that in turbulence generated by the single square grid, wake interactions occur close to the grid and cause extreme/intense events. Then, the spatial development of invariants of the velocity gradient tensor is studied. For example, the (Q(W), -Q(S)) maps are analyzed to show how turbulence generated by a single square grid obtains large scale vortices along the centerline. (C) 2014 AIP Publishing LLC.

    DOI: 10.1063/1.4870167

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  • DNS Study on the Development of Boundary Layer with Heat Transfer under the Effects of External and Internal Disturbances Reviewed

    Shuang XIA, Yasumasa Ito, Koji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Osamu Terashima, Toshiyuki Hayase

    Journal of Fluid Science and Technology   9 ( 1 )   JFST0005 - (13 pages)   2014.3

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  • Relevance of turbulence behind the single square grid to turbulence generated by regular- and multiscale-grids Reviewed

    Yi Zhou, Kouji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Yasumasa Ito, Osamu Terashima, Toshiyuki Hayase

    Physics of Fluids   26 ( 7 )   075105 - (22 pages)   2014

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    © 2014 AIP Publishing LLC. Direct numerical simulations were carried out to study the turbulence generated by a fractal square grid at a Reynolds number of ReL0 = 20000 (based on the inlet velocity Uin and length of the largest grid bar L0). We found that in the near-field region, the fractal square grid can generate much higher turbulence levels and has a bettermixing performance than the single square grid. However, the current numerical results show that a single square grid can produce a turbulence intensity and turbulent Reynolds number at the end of the simulation region (i.e., X/L0 ≃ 13) comparable to those of a higher-blockage fractal square grid because the two turbulent flows have quite different energy decay rates. We also demonstrated that for the fractal square grid, the length L0 gives a physical description of the inlet Reynolds number. An examination of the characteristic length scale for the fractal square grid reveals that the unusual high energy decay rates in previous experiments [D. Hurst and J. C. Vassilicos, "Scalings and decay of fractal-generated turbulence," Phys. Fluids 19, 035103 (2007); N. Mazellier and J. C. Vassilicos, "Turbulence without Richardson- Kolmogorov cascade," Phys. Fluids 22, 075101 (2010)] are limited in the near-field (initial decay) region, although this region can last for many meters downstream of the fractal square grids after the production region. Simulation results suggest that the turbulence intensity and energy decay rate of the fractal-generated turbulence may go back to classical values in the region X > 13L0. Additional simulations demonstrate that the fractal square grid can be regarded as an efficient additional turbulence generator in the near-field and can increase turbulent mixing near the grid.

    DOI: 10.1063/1.4890746

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  • Numerical Study of Dynamic Inflow Effects on Aerodynamic Response of HAWT Rotor Reviewed

    Yuta Taniguchi, Yutaka Hasegawa, Noriyuki Tanimura, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the International Symposium on EcoTopia Science 2013   Paper No. 1034 - (1 page)   2013.12

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  • Study on Blade Elasticity Influence on Blade Load Characteristics of NREL Turbine Reviewed

    Fumiya Hara, Yutaka Hasegawa, Noriyuki Tanimura, Hiroki Suzuki, Tatsuo Ushijima

    Proceedings of the International Symposium on EcoTopia Science 2013   Paper No. 1063 - (1 page)   2013.12

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  • Direct Numerical Simulation of Grid-Generated Turbulence (Analysis on Invariants and Rotta Model) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

    Transactions of the Japan Society of Mechanical Engineering Series B (in Japanese)   79 ( 807 )   2363 - 2374   2013.11

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  • DNS of Channel Flow with Two-Scale Surface Roughness on One Wall Reviewed

    Hiroki Suzuki, Richard J. Perkins

    Proceedings of the 14th European Turbulence Conference   Paper No. 115 - (2 pages)   2013.9

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  • Study on the Effects of Grid-Generated Turbulence on the Initial Growth of Turbulent Boundary Layer by Direct Numerical Simulation Reviewed

    S. Xia, Y. Ito, K. Nagata, Y. Sakai, H. Suzuki, O. Terashima, T. Hayase

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   paper No. 1169 - (4 pages)   2013.9

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  • Direct Numerical Simulation of Single-Square Grid-Generated Turbulence Reviewed

    Y. Zhou, K. Nagata, Y. Sakai, H. Suzuki, Y. Ito, O. Terashima, T. Hayase

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   paper No. 1102 - (5 pages)   2013.9

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  • Effects of Initial Condition on Coherent Structure and Evolution of Turbulent Plane Jets Reviewed

    N. Wu, Y. Sakai, K. Nagata, H. Suzuki, O. Terashima, T. Hayase

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   paper No. 1010 - (6 pages)   2013.9

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  • Measurement of Axial Turbulent Scalar Flux of High Sc/Low Re Round Jet Using Line Scan Camera Reviewed

    Hiroshi Nishiyama, Tatsuo Ushijima, Hiroki Suzuki, Yutaka Hasegawa

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   Paper No. 1193 - (5 pages)   2013.9

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  • Development and Quantitative Validation of a Numerical Code Using Highly Energy-Conservative Scheme Reviewed

    Masaya Watanabe, Hiroki Suzuki, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   Paper No. 1170 - (4 pages)   2013.9

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  • DNS Study on Pressure Characteristics of Fractal- Generated Turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of the 4th International Conference on Jets, Wakes and Separated Flows   Paper No. 1109 - (4 pages)   2013.9

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  • Analysis of Flow Characteristics of Turbulent Plane Jets Based on Velocity and Scalar Fields Using DNS Reviewed

    Nannan Wu, Yasuhiko Sakai, Kouji Nagata, Hiroki Suzuki, Osamu Terashima, Toshiyuki Hayase

    Journal of Fluid Science and Technology   8 ( 3 )   247 - 261   2013.8

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  • DNS on Multiscale- Generated Grid Turbulence Using Classical Grid Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

    Proceedings of the 8th International Symposium on Turbulence and Shear Flow Phenomena   Paper No. HOM1E - (6 pages)   2013.8

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  • Fractal analysis of turbulent mixing in fractal-generated turbulence by planar laser-induced fluorescence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Yutaka Hasegawa

    Physica Scripta   88 ( 155 )   014062 - (5 pages)   2013.7

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    The fractal geometry of turbulent mixing of high-Schmidt-number scalars in multiscale, fractal-generated turbulence (FGT) is experimentally investigated. The difference between the fractal geometry in FGT and that in classical grid turbulence (CGT) generated by a biplane, single-scale grid is also investigated. Nondimensional concentration fields are measured by a planar laser-induced fluorescence technique whose accuracy has recently been improved by our research group, and the fractal dimensions are calculated by using the box-counting method. The mesh Reynolds number is 2500 for both CGT and FGT. The Schmidt number is about 2100. It is found that the threshold width ΔC th, when applying the box-counting method, does not affect the evaluation of the fractal dimension at large scales
    therefore, the fractal dimensions at large scales have been investigated in this study. The results show that the fractal dimension in FGT is larger than that in CGT. In addition, the fractal dimension in FGT monotonically increases with the onset of time (or with the downstream direction), whereas that in CGT is almost constant with time. The investigation of the number of counted boxes in a unit area, together with the above results, suggests that turbulent mixing is more enhanced in FGT from the viewpoints of fractal geometry and expansion of the mixing interface. © 2013 The Royal Swedish Academy of Sciences.

    DOI: 10.1088/0031-8949/2013/T155/014062

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  • An Attempt to Improve Accuracy of PIV Using an Interpolation Method Reviewed

    Hiroki Suzuki, Tatsuo Ushijima, Yutaka Hasegawa, Kouji Nagata, Yasuhiko Sakai

    Proceedings of the 12th Asian Symposium on Visualization   Paper No.218 - (4 pages)   2013.5

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  • Effects of the Cylinder Wake in a Freestream on Statistical Properties of a Turbulent Boundary Layer Reviewed

    NAGATA Kouji, TERASHIMA Osamu

    Transaction of the Japan Society of Mechanical Engineering Series B   79 ( 799 )   291 - 303   2013

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    Effects of the cylinder wake in a freestream on statistical properties of a turbulent boundary layer over a flat plate are investigated by means of wind tunnel experiments. The cylinder is set horizontally over the flat plate and the interactions between its wake and the zero-pressure-gradient turbulent boundary layer are investigated. Instantaneous velocity is measured by using hot wire anemometry. The bursting events are detected by the variable interval time average (VITA) technique. The results show that the time-averaged mean velocity in the inner layer with the cylinder wake coincides with that without the cylinder wake. However, turbulence intensities normalized by the inner parameters are suppressed by the cylinder wake. It is found that the peak value of the velocity fluctuation during the sweep phase in the bursting event is increased by the cylinder wake.

    DOI: 10.1299/kikaib.79.291

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  • Visualization of turbulent reactive jet by using direct numerical simulation Reviewed

    Tomoaki Watanabe, Yasuhiko Sakai, Kouji Nagata, Osamu Terashima, Hiroki Suzuki, Toshiyuki Hayase, Yasumasa Ito

    International Journal of Modeling, Simulation, and Scientific Computing   4 ( SUPPL.1 )   1341001 - (16 pages)   2013

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    Direct numerical simulation (DNS) of turbulent planar jet with a second-order chemical reaction (A + B → R) is performed to investigate the processes of mixing and chemical reactions in spatially developing turbulent free shear flows. Reactant A is premixed into the jet flow, and reactant B is premixed into the ambient flow. DNS is performed at three different Damköhler numbers (Da = 0.1,1, and 10). Damköhler number is a ratio of a time scale of a flow to that of chemical reactions, and in this study, the large Da means a fast chemical reaction, and the small Da means a slow chemical reaction. The visualization of velocity field shows that the jet flow is developed by entraining the ambient fluid. The visualization of concentration of reactant A shows that concentration of reactant A for Da = 1 and 10 becomes very small in the downstream region because the chemical reaction consumes the reactants and reactant A is diffused with the jet development. By comparison of the profiles of chemical reaction rate and concentration of product R, it is found that product R for Da = 10 is produced by the chemical reaction at the interface between the jet and the ambient fluids and is diffused into the jet flow, whereas product R for Da = 0.1 is produced in the jet flow after reactants A and B are well mixed. © 2013 World Scientific Publishing Company.

    DOI: 10.1142/S1793962313410018

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  • Wind Tunnel Experiments on the Spatial Development of Fractal-Grid Turbulence (2nd Report, Measurements of Turbulent Kinetic Energy Transport by Using I- and X-Type Hot-Wire Probes) Reviewed

    INABA Takuto, NAGATA Kouji, SAKAI Yasuhiko, SUZUKI Hiroyuki, TERASHIMA Osamu, SUZUKI Hiroki

    Transaction of the Japan Society of Mechanical Engineering Series B   79 ( 804 )   1476 - 1488   2013

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    Spatial development of a turbulent field generated by a multiscale, fractal-grid is investigated in a wind tunnel. A square type (i.e., fractal elements with square shapes) fractal grid is placed at the inlet of the test section. The Reynolds number based on the length of the biggest grid bar is set to 5900. The spatial developments of cross-sectional profiles of turbulent kinetic energy K, dissipation rate of K, ε, and the advection, production, triple-correlation transport, pressure transport and viscous diffusion terms in the transport equation of K are measured by using a hot wire anemometer. The results show that in the upstream region, turbulence produced by the biggest grid bar is transported to the central and outward regions by the triple-correlation term T. In the decay region, there is low turbulence production downstream of the interior of the biggest grid bar, which is mainly transported outward rather than to the central region by T. The advection term is large and positive in the decay region whereas the pressure transport and the viscous diffusion terms are very small in the decay region.

    DOI: 10.1299/kikaib.79.1476

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  • Wind Tunnel Experiments on the Spatial Development of Fractal-Grid Turbulence (1st Report, Measurements of Fundamental Turbulence Properties by Using an I-Type Hot-Wire Probe) Reviewed

    NAGATA Kouji, TERASHIMA Osamu

    Transaction of the Japan Society of Mechanical Engineering Series B   79 ( 798 )   115 - 125   2013

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    Spatial development of a turbulent field generated by a multiscale, fractal-grid is investigated in a wind tunnel. A square type (i.e., fractal elements with square shapes) fractal grid is placed at the inlet of the test section. The Reynolds numbers based on the length of the biggest grid bar are set to 5900 and 11400. Turbulent characteristics in the downstream region of the grid are measured by using a hot wire anemometer. The results on the centerline statistics are compared with those in the previous experiments at the same Reynolds numbers. The results on the centerline statistics generally agree with the previous measurements despite the difference in the size of the test sections used. The spatial developments of cross-sectional profiles are also measured. It is found that the non-uniformity in the mean velocity field almost disappear in the downstream direction, although the non-uniformities of higher-order statistics are still observed even in the far downstream region. In the entire cross section of the tunnel, the ratio of the integral length scale Lu to the Taylor microscale λ hardly changes in the decay region of the rms velocity. These results will provide useful information in clarifying the non Richardson-Kolmogorov cascade process in the fractal-generated turbulence found in the previous measurement (Mazellier and Vassilicos, Physics of Fluids, Vol. 22, 075101 2010).

    DOI: 10.1299/kikaib.79.115

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  • Turbulence structure and turbulence kinetic energy transport in multiscale/fractal-generated turbulence Reviewed

    Kouji Nagata, Yasuhiko Sakai, Takuto Inaba, Hiroki Suzuki, Osamu Terashima, Hiroyuki Suzuki

    Physics of Fluids   25 ( 6 )   065102 - (26 pages)   2013

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    The turbulence structure and turbulence kinetic energy transport in multiscale/fractal-generated turbulence in a wind tunnel are investigated. A low-blockage, space-filling square-type (i.e., fractal elements with square shapes) fractal grid is placed at the inlet of the test section. On the basis of the thickness of the biggest grid bar, t0, and the inflow velocity U∞, the Reynolds numbers (Re0) are set to 5900 and 11 400; these values are the same as those considered in previous experiments [D. Hurst and J. C. Vassilicos, "Scalings and decay of fractal-generated turbulence," Phys. Fluids19, 035103 (2007)10.1063/1.2676448; N. Mazellier and J. C. Vassilicos, "Turbulence without Richardson-Kolmogorov cascade," Phys. Fluids22, 075101 (2010)10.1063/1.3453708]. The turbulence characteristics are measured using hot-wire anemometry with I- and X-type probes. Generally, good agreements are observed despite the difference in the size of the test sections used: The longitudinal integral length-scale Lu and the Taylor microscale λ, and their ratio Lu/λ, are approximately constant during decay and are independent of the turbulent Reynolds number Reλ. Centerline statistical results support the finding of Mazellier and Vassilicos, namely, that the classical scaling of Lu/λ ~ Reλ and the Richardson-Kolmogorov cascade are not universal to all boundary-free weakly sheared/strained turbulence. The cross-sectional profiles show that in the entire cross section of the tunnel, Lu/λ hardly changes in the decay region of the rms velocity, which implies that the turbulent field is self-similar. The production and transport of turbulence kinetic energy K in fractal grid turbulence are also investigated from cross-sectional profiles of the advection A*, production P*, triple-correlation transport T*, pressure transport Π*, viscous diffusion D*, and dissipation e{open} terms in the K transport equation. In the upstream region, turbulence produced by the biggest grid bar is transported to the central and outward regions by T*. In the decay region, there is low turbulence production downstream of the interior of the biggest grid bar; turbulence energy in this region is mainly transported outward rather than toward the central region by T(=T*/e{open}. This characteristic of T may cause a faster decay of K in the central region, as observed by Valente and Vassilicos ["The decay of turbulence generated by a class of multiscale grids," J. Fluid Mech.687, 300 (2011)10.1017/jfm.2011.353]. The advection term A* is high and positive in the decay region, whereas Π* and D* are low. © 2013 AIP Publishing LLC.

    DOI: 10.1063/1.4811402

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  • Experimental Study on the Mixing of High-Schmidt-Number Scalar in Regular/Fractal Grid Turbulence Reviewed

    NAGATA Kouji, TERASHIMA Osamu, ITO Yasumasa

    Transaction of the Japan Society of Mechanical Engineering Series B   79 ( 799 )   304 - 316   2013

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    High-Schmidt-number scalar mixing layers in a turbulent flow generated by regular and fractal grids are investigated by means of experiments using particle image velocimetry (PIV) and planar laser induced fluorescence (PLIF) technique. The Reynolds number based on the mesh size is 2,500. Rhodamine B is used as a fluorescent dye. The Schmidt number is about 2,100. The flow is separated into upper and lower layers by a splitter plate installed upstream of the grids; thus, the turbulent scalar mixing layers develop downstream of the grids. The results show that fractal grid turbulence has stronger turbulence intensity than that in regular grid turbulence. The decay exponent of turbulence intensity, n, is n = 1.21 for the regular grid and n = 1.40 for the fractal grid. The eddy diffusivity for mass in fractal grid turbulence is approximately four times larger than that in regular grid turbulence. The scalar dissipation in fractal grid turbulence is smaller than that in regular grid turbulence. Finally, it is concluded that turbulent scalar mixing is more enhanced by the fractal grid than by the regular grid.

    DOI: 10.1299/kikaib.79.304

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  • Quantitative visualization of high-Schmidt-number turbulent mixing in grid turbulence by means of PLIF Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai

    Journal of Visualization   15 ( 2 )   109 - 117   2012.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER  

    Quantitative visualization of high-Schmidt-number scalar fields has been performed in grid turbulence by means of a planar laser-induced fluorescence (PLIF) technique. The Reynolds number based on a mesh size of the grid is 2500 and the Schmidt number of the scalar is around 2100. To correct for the effects of various spatiotemporal variations such as quantum yield, a recently proposed correction method was introduced in the present experiment. In the present work, a PLIF experiment in combination with a calibration region installed outside of the test section is proposed. Visualizations of the instantaneous fluctuating scalar field suggest that mushroom-like structures accompanied by a pair of stirring structures, called engulfments, exist and contribute to large-scale scalar transfer. Visualization of the scalar dissipation field in the horizontal plane suggests that accumulation of the filament structures, which can be related to the mixing transition, locally exists around large-|c| regions, where |c| is the absolute value of the instantaneous fluctuating concentration. Thus, accumulation of the filament structures should be considered in the development of a turbulent mixing model for high-Schmidt-number scalar transfer.

    DOI: 10.1007/s12650-011-0121-y

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  • Improved PIV analysis using an interpolation technique (analysis on improvement effects of the fourier interpolation using quasi particle-images) Reviewed

    Hiroki Suzukib, Kouji Nagata, Yasuhiko Sakai, Yutaka Hasegawa

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   78 ( 790 )   1248 - 1259   2012

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    We attempted to improve accuracy of particle image velocimetry (PIV) analysis using cross correlation function by introducing method to interpolate the brightness distribution of the measurement images. The motivation of introduction of the interpolation is that uncertainty included in the measurement result may be decreased by introduction of a certain interpolation method. The Fourier interpolation was introduced as the interpolation method focused on that the brightness distribution of a particle can be well approximated by the Gaussian profile, and Fourier transform of the Gaussian profile is equal to the exponential function. Specifically, the sine-function interpolation, which is a kind of the Fourier interpolation, was used, because the brightness distribution is not periodic. The effects of interpolation were investigated by a numerical simulation using quasi particle-images. Parameters in the simulation are moving distance, the particle diameter and the camera noise. This analysis showed that introduction of the interpolation can decrease uncertainty included in the PIV result. © 2012 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaib.78.1248

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  • Investigation of Eddy Diffusivity in a Reactive Plane Jet by using Direct Numerical Simulation Reviewed

    Tomoaki Watanabe, Yasuhiko Sakai, Kouji Nagata, Osamu Terashima, Yasumasa Ito, Hiroki Suzuki, Toshiyuki Hayase

    Communications in Computer and Information Science   323 CCIS ( PART 1 )   144 - 150   2012

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    Eddy diffusivity in a planar turbulent jet with a second-order chemical reaction (A+B→R) is investigated by using direct numerical simulation. Reactant A and B are premixed into the jet flow and the main flow, respectively. The eddy diffusivity of species A on the jet centerline is calculated from the mean concentration of species A and the streamwise turbulent mass flux of the species A. The results show that the chemical reaction makes the eddy diffusivity of species A small, and the effects of the chemical reaction on the eddy diffusivity depend on the Damköhler number. From these results, we can conclude that the gradient diffusion model should be used with considerations of the effects of chemical reactions on eddy diffusivity. © 2012 Springer-Verlag.

    DOI: 10.1007/978-3-642-34384-1_18

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  • Quantitative Visualization of High-Schmidt-Number Scalar Mixing in Grid Turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai

    Proceedings of the 11th Asian Symposium on Visualization   Paper No. ASV11-04-05 - (8 pages)   2011.6

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  • Statistical properties of a turbulent boundary layer affected by grid-generated turbulence (analysis of spatial development by means of direct numerical simulation) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   77 ( 775 )   737 - 748   2011

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    The effects of grid-generated turbulence on a turbulent boundary layer are investigated by means of a direct numerical simulation (DNS). A square turbulence-generating grid, on which the velocity components are set to zero, is numerially constructed near the entrance to a rectangular parallelepiped domain. The nonslip condition is applied to the lower boundary to develop a turbulent boundary layer downstream of the turbulence-generating grid. The fractional step method is used to solve the governing equations. The results show that streamwise and vertical turbulence intensities and Reynolds stress normalized by the inner parameters are suppressed in the log-law region by the grid turbulence. © 2011 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaib.77.737

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  • An experimental study on turbulent mixing of high-Schmidt-number scalar in grid turbulence by means of PIV and PLIF Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Ryota Ukai

    ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011   1 ( D )   3763 - 3767   2011

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    Turbulent mixing of high-Schmidt-number passive scalar in shear-free grid turbulence is experimentally investigated using a water channel. The Reynolds number based on the mesh size of the grid and cross-sectionally averaged mean velocity is 2, 500. Rhodamine B (fluorescent dye) was used as a high-Schmidt-number passive scalar. The Schmidt number is about 2, 100. The time-resolved particle image velocimetry (PIV) and the planar laser induced fluorescence (PLIF) technique were used to measure instantaneous two-component velocities and nondimensional concentration. Our PLIF algorithm corrects the following errors: spatiotemporal variation of local excitation intensity due to an inhomogeneous concentration field along the light path, time variation of fluorescence quantum yield, and spatiotemporal variation of incident laser intensity. The results show that the vertical profile of mean scalar can be well approximated by the error function. In contrast, the profile of scalar variance in outer region of the mixing layer cannot be approximated by the Gaussian profile. In addition, the half width of mean scalar is larger than that of the scalar variance profile. Copyright © 2011 by ASME.

    DOI: 10.1115/AJK2011-21013

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  • DNS on a spatially developing grid turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    (全文査読付) Proceedings of the 13th European Turbulence Conference   318   032043 - (5 pages)   2011

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    The purpose of this study is to investigate fundamental statistics of a spatially developing grid turbulence by means of direct numerical simulation based on the finite difference method. The Reynolds number based on the mesh size, M, is 2500, and streamwise computational domain size normalized by M is 112. The streamwise profiles of turbulent intensities show that the large-scale fluctuating velocity field is quasi-isotropic in the region x/M > 4, where x is the streamwise distance from the grid. The derivative skewness of streamwise fluctuating velocity u is smaller than those of vertical and spanwise fluctuating velocities in the far downstream region. On the other hand, the derivative flatness of u, v, and w are almost identical in the far downstream region.

    DOI: 10.1088/1742-6596/318/3/032043

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  • Direct Numerical Simulation on Turbulence Structures in a Transition Process of a Spatially Developing Turbulent Plane Jet Reviewed

    Hiroki Suzuki, Yasuhiko Sakai, Kouji Nagata, Daisuke Sugimoto

    Proceedings of the 3rd International Conference on Jets, Wakes, and Separated Flows   CD-ROM   - (6 pages)   2010.9

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  • Direct Numerical Simulation of Regular and Fractal-Grid Turbulence Using the Immersed Boundary Method and Fully Conservative Higher Order Finite-Difference Schemes Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    International Review of Physics   4 ( 2 )   83 - 90   2010.4

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  • The image correction method for PLIF measurements of high-schmidt-number scalar transfer (Nonmetric corrections for temporospatial variation of laser intensity and time variation of fluorescence quantum yield) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Ryota Ukai

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   76 ( 770 )   1543 - 1551   2010

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    In the conduct of planar laser induced fluorescence (PLIF) measurements of high-Sc-number scalar transfer, the following errors are included in all captured images. First, local excitation intensity of fluorescence is affected by the surrounding concentration field. Secondly, fluorescence quantum yield has time dependence. Thirdly, laser intensity has temporospatial distribution. In this paper, we propose a nonmetric image correction method to improve the accuracy in PLIF measurement, in which above-mentioned problems were completely removed. The method was applied to the PLIF measurement of high-Sc-number scalar transfer in grid-generated turbulence. The results show that turbulence statistics on concentration are properly estimated by using the present method.

    DOI: 10.1299/kikaib.76.770_1543

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  • Direct numerical simulation of turbulent mixing in regular and fractal grid turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    Physica Scripta T   T142   2010

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    Turbulent mixing in regular and fractal grid turbulence is investigated in this work by using direct numerical simulation (DNS). Two types of turbulence-generating grids are used: a biplane square grid (regular grid) and a square fractal grid. The thickness ratios tr of the fractal grids are set at 5.0 and 8.5. The grid solidity is maintained at σ=0.36 for all the grids. The mesh Reynolds number, ReM=U0M eff/ν, is set at 2500 for all cases, where U0 is the cross-sectionally averaged mean velocity
    Meff, the effective mesh size
    and ν, the kinematic viscosity. The grids are numerically generated using the immersed boundary method at 4Meff downstream of the entrance to the computational domain. The computational domain size normalized by Meff is 64×8×8 in the streamwise, vertical and spanwise directions for the regular grid and 64×16×16 for the fractal grids. Scalar mixing layers that initially have a step profile develop downstream of the grids. The Prandtl number is set at Pr=0.71 considering the heat transfer in air flow. Instantaneous temperature fields, instantaneous fluctuating temperature fields and fundamental turbulent statistics are presented. The results show that turbulent mixing is more strongly enhanced in fractal grid turbulence than in regular grid turbulence for the same Re M. In fractal grid turbulence, turbulent mixing is more strongly enhanced at tr=8.5 than at tr=5.0. © 2010 The Royal Swedish Academy of Sciences.

    DOI: 10.1088/0031-8949/2010/T142/014065

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  • Turbulence structure of multiscale generated turbulence by fractal grids and scalar transfer mechanism (2nd report, DNS on the influence of grid parameters on homogeneity, isotropy and intermittency) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   76 ( 772 )   2024 - 2031   2010

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    Turbulence characteristics in the spatially developing fractal-generated turbulence are investigated by means of the direct numerical simulation (DNS). The square type fractal grids are numerically constructed using the immersed boundary method. The effects of solidity σ and thickness ratio t r, which are ones of the most important grid parameters for fractal grids, are investigated in detail. The results show that the increase of a leads to the improvement of the uniformity and isotropy of flow fields. The integral length scale in the decaying region of the fractal-generated turbulence remains monotone increase at high σ and tr, whereas it is approximately constant at low σ and tr. The derivative skewness and flatness in the streamwise direction are different from those in the transverse direction for all σ and tr investigated. These results will be useful for designing fractal grids for practical applications.

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  • Direct numerical simulation of fractal-grid generated turbulence using an immersed boundary method and high accuracy finite-difference schemes Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

    Transaction of the Japan Society for Mathematical Science (in Japanese)   11 ( 1 )   33 - 38   2009.12

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  • Turbulence Structure of Multiscale Generated Turbulence by Fractal Grids and Scalar Transfer Mechanism : 1st Report, DNS on the Effect of Fractal Shapes on Turbulent Flow Field Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    Transactions of the Japan Society of Mechanical Engineering Series B (in Japanese)   75 ( 755 )   1387 - 1394   2009.7

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  • DNS of Passive Scalar Field with Mean Gradient in Fractal-Generated Turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    Proceedings of the 6th International Symposium on Turbulence and Shear Flow Phenomena   1   55 - 60   2009.6

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  • Improvement of the DNS of turbulent channel flow using the finite difference method (Introduction of the compact scheme to the viscous terms for high spatial resolution in the dissipation range) Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B   75 ( 752 )   642 - 649   2009

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    In an attempt to improve the accuracy in direct numerical simulation (DNS) of fully developed incompressible turbulent channel flow using the finite difference method, the fourth and eighth order central compact schemes with 'spectrallike resolution' have been introduced to the viscous terms, which play an important role in the dissipation range in the near wall turbulence. The DNSs using the conventional second and fourth order central difference schemes are also conducted for comparison. The results are compared with those obtained by the spectral method. The results show the improvement in accuracy by the introduction of the compact schemes. The remarkable improvements in the power and dissipation spectra are also confirmed in the dissipation range.

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  • PLIFによる高Sc数パッシブスカラー乱流輸送解析

    鈴木 博貴, 長田 孝二, 酒井 康彦, 鵜飼 涼太

    化学工学会 研究発表講演要旨集   2009   104 - 104   2009

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    DOI: 10.11491/scej.2009f.0.104.0

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  • Direct Numerical Simulation of Turbulent Mixing in Grid-Generated Turbulence Reviewed

    Kouji Nagata, Hiroki Suzuki, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    Physica Scripta   2008 ( T132 )   014054 - (5 pages)   2008.12

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    Turbulent mixing in regular and fractal grid turbulence is investigated in this work by using direct numerical simulation (DNS). Two types of turbulence-generating grids are used: a biplane square grid (regular grid) and a square fractal grid. The thickness ratios t(r) of the fractal grids are set at 5.0 and 8.5. The grid solidity is maintained at sigma = 0.36 for all the grids. The mesh Reynolds number, Re-M = U0Meff/nu, is set at 2500 for all cases, where U-0 is the cross-sectionally averaged mean velocity; M-eff, the effective mesh size; and nu, the kinematic viscosity. The grids are numerically generated using the immersed boundary method at 4M(eff) downstream of the entrance to the computational domain. The computational domain size normalized by M-eff is 64 x 8 x 8 in the streamwise, vertical and spanwise directions for the regular grid and 64 x 16 x 16 for the fractal grids. Scalar mixing layers that initially have a step profile develop downstream of the grids. The Prandtl number is set at Pr = 0.71 considering the heat transfer in air flow. Instantaneous temperature fields, instantaneous fluctuating temperature fields and fundamental turbulent statistics are presented. The results show that turbulent mixing is more strongly enhanced in fractal grid turbulence than in regular grid turbulence for the same Re-M. In fractal grid turbulence, turbulent mixing is more strongly enhanced at t(r) = 8.5 than at t(r) = 5.0.

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  • Direct Numerical Simulation of Turbulence Characteristics Generated by Fractal Grids Reviewed

    Kouji Nagata, Hiroki Suzuki, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    International Review of Physics   2 ( 6 )   400 - 409   2008.12

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  • フラクタル格子乱流の直接数値シミュレーション

    鈴木 博貴, 長田 孝二, 酒井 康彦, 早瀬 敏幸, 久保 貴

    化学工学会 研究発表講演要旨集   2008   5 - 5   2008

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    DOI: 10.11491/scej.2008.0.5.0

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  • Direct Numerical Simulation of the Convective Boundary Layer with External Grid Turbulence Reviewed

    Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Takashi Kubo

    Proceedings of the 18th International Symposium on Transport Phenomena   1957 - 1961   2007.8

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  • Direct numerical simulation of turbulent boundary layer downstream of turbulence-generating grid Reviewed

    H. Suzuki, K. Nagata, Y. Sakai, T. Hayase, T. Kubo

    Proceedings of the 5th Joint ASME/JSME Fluids Engineering Conference   2   1407 - 1411   2007

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    The effects of external grid turbulence in a free stream on the turbulent boundary layer are investigated by means of the direct numerical simulation (DNS). A square turbulence-generating grid, on which the velocity components are set to zero, is located upstream of the flat boundary with a nonslip condition. The fractional step method is used to solve the governing equations. The results show that turbulence intensities and Reynolds stress normalized by the inner parameters are significantly suppressed in the log-law region by the external grid turbulence.

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  • 格子乱流下に形成される壁面上乱流境界層流中の熱移動に関する直接数値計算

    鈴木 博貴, 長田 孝二, 酒井 康彦

    化学工学会 研究発表講演要旨集   2007   307 - 307   2007

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    DOI: 10.11491/scej.2007.0.307.0

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Books

  • Handbook of Particle Image Velocimetry (second ed.), Grid-generated Turbulence

    Hiroki Suzuki, Koji Nagata, Yasuhiko Sakai, Yutaka Hasegawa( Role: Contributor)

    Morikita Publishing  2018.5 

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  • Fractal Analysis - Applications in Physics, Engineering and Technology「Analysis and Application of Decaying Turbulence with Initial Fractal Geometry」

    Fernando Brambila ed, Hiroki Suzuki, Shinsuke Mochizuki, Yasuhiko Sakai, Koji Nagata( Role: Contributor ,  pp.267-283)

    Intech  2017.6 

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  • Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015),「Wall Similarity in Turbulent Boundary Layers Subjected to Weak Pressure Gradients」

    Antonio Segalini ed, Shinsuke Mochizuki, Hiroki Suzuki, Hiroshi Tokunaga, Takatsugu Kameda, oth( Role: Contributor ,  pp.317-324)

    Springer  2016.7 

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  • Fractal Flow Design: How to Design Bespoke Turbulence and Why「Mixing and Diffusion in Regular/Fractal Grid Turbulence」

    Yasuhiko Sakai, Christos Vassilicos ed, Yasuhiko Sakai, Koji Nagata, Hiroki Suzuki, Yasumasa Ito, o( Role: Contributor ,  pp. 17-73)

    CISM International Center for Mechanical Sciences  2016.6 

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  • Development of a PIV System and a Measurement of Grid-Generated Turbulence

    Hiroki Suzuki, Koji Nagata, Yasuhiko Sakai( Role: Contributor ,  pp. 29-34)

    Journal of the Visualization Society of Japan (Vol. 35, No. 139)  2015.10 

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  • Wind Tunnels and Experimental Fluid Dynamics Research「Relationships between Large-Scale Coherent Motions and Bursting Events in a Turbulent Boundary Layer」

    Jorge Colman Lerner, Ulfilas Boldes ed, Yasuhiko Sakai, Kouji Nagata, Hiroki Suzuki, o( Role: Contributor ,  pp. 493-508)

    Intech  2011.7 

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  • Numerical Simulations - Examples and Applications in Computational Fluid Dynamics 「Direct Numerical Simulation of Turbulence with Scalar Transfer Around Complex Geometries Using the Immersed Boundary Method and Fully Conservative Higher-Order Finite-Diffe

    Lutz Angermann ed, Kouji Nagata, Hiroki Suzuki, Yasuhiko Sakai, Toshiyuki Hayase, o( Role: Contributor ,  pp. 39-62)

    Intech  2010.12 

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  • フラクタル形状物体の背後にはどのような流れができるのか?(特集:Best Shot 写真でひもとく未来材料)

    長田孝二, 鈴木博貴, 酒井康彦( Role: Contributor ,  執筆頁pp.1-4)

    (株)エヌ・ティー・エス  2010.6 

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  • 名古屋大学工学研究科情報誌PRESS e 「乱流の研究」

    鈴木 博貴( Role: Contributor ,  執筆頁p.15)

    2008 

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MISC

  • Fundamental and Application of Grid-Generated Turbulence Invited

    Hiroki Suzuki

    Water Seminar Series of Loughborough University   2019.4

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  • Enforcement of the Conservation of Kinetic Energy in Incompressible Turbulence Simulations Invited

    Hiroki Suzuki, Shinsuke Mochizuki

    Digest of the 10th Annual Joint Seminar between KNU and YU   2018.9

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  • Analysis and Application of Decaying Turbulence with Initial Fractal Geometry

    2017.6

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    Detal experimental study on the turbulence behind fractal grid

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  • 204 Study on Reduction of Calculation Load for Wake Flow Analysis of Horizontal Axis Wind Turbine Rotors

    KUBOTA Kazuki, HASEGAWA Yutaka, USHIJIMA Tatsuo, SUZUKI Hiroki

    2016 ( 65 )   "204 - 1"-"204-2"   2016.3

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  • 228 Basic Study on the Effect of Weak Fluid Acceleration on a Decaying Grid Turbulence using the k-ε Model

    SUZUKI Hiroki, MOCHIZUKI Shinsuke, HASEGAWA Yutaka, MATSUO Shinnosuke, USHIJIMA Tatsuo

    2016 ( 65 )   "228 - 1"-"228-2"   2016.3

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  • 1409 Basic study of the effects of non-solenoidality in the viscous terms on the incompressible flow simulation

    HATTORI Shingo, SUZUKI Hiroki, MOCHIZUKI Shinsuke

    2016 ( 54 )   "1409 - 1"-"1409-2"   2016.2

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  • 1207 Flow field around a circular cone placed in boundary layer : Effect of apex angle

    KASHIMA Tomoyuki, DAN HUN, SUZUKI Hiroki, MOCHIZUKI Shinsuke

    2016 ( 54 )   "1207 - 1"-"1207-2"   2016.2

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  • 1211 Development of measurement technique of the wall shear stress with the thermochromic liquid crystal

    SHIBUYA Yuta, KODAMA Takashi, SUZUKI Hiroki, MOCHIZUKI Shinsuke

    2016 ( 54 )   "1211 - 1"-"1211-2"   2016.2

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  • 1523 Measurement of the Wall Shear Stress used a Thin Circular Plate as Obstacle

    KISHII Yoshiaki, SUZUKI Hiroki, MOCHIZUKI Shinsuke

    Fluids engineering conference ...   2015   "1523 - 1"-"1523-4"   2015.11

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    A local wall shear stress measurement method is proposed with a thin circular plate submerged in the wall layer. A calibration curve of pressure difference produced by the plate and near wall flow can be correlated with the local wall shear stress by a single analytical function for different plate thickness. For approaching angle of attack to the mean flow, the circular plate has well sensitive in comparison with the rectangular plate.

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  • 0217 Turbulence properties in exponential decay region of turbulence generated through Sierpinski tetrahedron

    KATO Takaaki, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2015   "0217 - 1"-"0217-2"   2015.11

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    In the decay of turbulence generated by passing through Sierpinski tetrahedron, there exists a region in accordance with the exponetial law, without obeying the power law. In this study, mechanism of exponential decay is investigated by measuring the profile of velocity statistics over the cross section. Mean velocity profiles are similar to each other amongst the structures with different number of iteration (N=2, 3, 4) and so are turbulence intensities except the case for the least number (N=2).

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  • 1503 Pressure Gradient Effects on the Similarity Law of Turbulent Boundary Layers

    AMANO Kouichi, SUZUKI Hiroki, KAMEDA Takatsugu, MOCHIZUKI Shinsuke

    Fluids engineering conference ...   2015   "1503 - 1"-"1503-3"   2015.11

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    Detailed experiments have been made for effect of the adverse and favorable pressure gradients on the low of the wall in turbulent boundary layers. The local wall shear stress was measured by a direct measurement device. Mean and turbulent velocity profiles were measured by hot wire anemometer. A new velocity scale defined by considering significant contribution of inertia term in integrating the equations of motion was applied to the near wall statistical properties. The log-law modified with the new velocity scale agrees well with experimental data. The streamwise turbulent intensity profile in the wall layer is likely to be scaled successfully with the new velocity scale.

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  • 1519 Effect of Vortices on Turbulent Diffusion behind a Pyramid Obstacle Placed in a Boundary Layer

    HE Guangchao, MOCHIZUKI Shinsuke, SUZUKI Hiroki

    Fluids engineering conference ...   2015   "1519 - 1"-"1519-3"   2015.11

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    An experimental investigation has been conducted to examine the effects of vortices on turbulent diffusion behind a pyramid placed on the wall in a turbulent boundary layer. Turbulent diffusion process was observed with CO_2 injection near the pyramid. The concentration of CO_2 was detected by RI-85 monitor with Non Dispersive Infrared Radiation technology. On the other hand, the velocity distribution was measured by a single hot-wire with constant temperature anemometer. Gas diffusion without pyramid in z direction is somewhat faster than in y direction. Pyramid can enhance gas diffusion but CO_2 contour map has non-uniform and strong concentration in the cross-streamwise plane behind the pyramid placed with angle of attack at γ=45°. The non-uniform diffusion could be explained with longitudinal vortices generated by the pyramid placed in the shear layer.

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  • 1509 Response of the turbulent pipe flow to sudden change in wall roughness

    KURIYAMA Masataka, SUZUKI Hiroki, MOCHIZUKI Shinsuke

    Fluids engineering conference ...   2015   "1509 - 1"-"1509-4"   2015.11

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    Approaching process of the turbulent pipe flow subjected by sudden change of the wall roughness has been investigated experimentally. The mean velocity, streamwise turbulent intensity, Reynolds stress profiles and the local wall shear stress were measured for the initial stage of the process after change wall condition from rough to smooth. The mean velocity profiles show acceleration before approaching to fully-developed smooth wall flow; overshoot behavior can be seen for the relaxation process. The local wall shear stress takes larger value for the acceleration of the near wall mean velocity profile and corresponds to larger Reynolds shear stress near the wall.

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  • J0550304 Estimation of turbulent kinetic energy dissipation rate in oscillating-grid turbulence

    NAKAMOTO Takahiro, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Mechanical Engineering Congress, Japan   2015   "J0550304 - 1"-"J0550304-4"   2015.9

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    In turbulent flow, the energy dissipation rate is an important physical quantity for evaluating the Kolmogorov scale which is the smallest scale in turbulent flow. In the present study, nearly isotropic turbulence at low Reynolds number was generated by a pair of oscillating grid so that the Kolmogorov length can be large. We observed the velocity field by using PIV(Particle Image Velocimetry) method, and the energy dissipation rate was obtained from the velocity two-point correlation, the combination of velocity gradient and the identification of the vortex. These evaluation methods were examined by comparison.

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  • S0510202 Low resolution 2D-PIV measurement of low Reynolds number turbulent round jet

    NISHIYAMA Hiroshi, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Mechanical Engineering Congress, Japan   2015   "S0510202 - 1"-"S0510202-4"   2015.9

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    In this study, we carried out a low resolution 2D-PIV(Particle Image Velocimetry) measurement of low Reynolds number turbulent round jet. The spatial resolution was of the order of Taylor micro-scale and under-estimates the turbulence energy. Mean velocity statistics coincided with the standard reference. Second and third order statistics qualitatively in good agreement with the previous studies. The difference between the results is due to a loss of turbulence energy and the Reynolds number dependence. Nevertheless, the results showed the self-preserving property in far field region.

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  • 113 A Form of Rotational Speed Response to Inflow Velocity Variations Based on a Series Expansion at the Constant Tip-speed Ratio

    SUZUKI Hiroki, HASEGAWA Yutaka, USHIJIMA Tatsuo

    2015 ( 64 )   "113 - 1"-"113-2"   2015.3

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  • 160 A study on the error of secondary conservation caused by Crank-Nicolson method

    HASEBE Koudai, SUZUKI Hiroki, MATSUO Shinnosuke, HASEGAWA Yutaka, USHIJIMA Tatsuo

    2015 ( 64 )   "160 - 1"-"160-2"   2015.3

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  • 168 Comparison of the decay of turbulence generated through standard grid and Sierpinski tetrahedron

    KATO Takaaki, USHIJIMA Tatsuo, HASEGAWA Yutaka, SUZUKI Hiroki

    2015 ( 64 )   "168 - 1"-"168-2"   2015.3

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  • 169 Development of 8-sensor hot wire probe for measurement of velocity gradient tensor

    YANO Shoma, HISHIKAWA Eiji, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    2015 ( 64 )   "169 - 1"-"169-2"   2015.3

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  • 167 Numerical simulation and wind tunnel equipment for grid-generating turbulence

    MATSUO Shinnosuke, SUZUKI Hiroki, HASEGAWA Yutaka, USHIJIMA Tatsuo

    2015 ( 64 )   "167 - 1"-"167-2"   2015.3

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  • 159 Decomposed Effects of Noise Factors on Scalar Statistics in a PLIF Measurement

    SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko, HASEGAWA Yutaka, USHIJIMA Tatsuo

    2015 ( 64 )   "159 - 1"-"159-2"   2015.3

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  • 112 Study on aerodynamic and mechanical characteristics on wing-stroke wind turbine

    NAKANO Hironori, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    2015 ( 64 )   "112 - 1"-"112-2"   2015.3

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  • Measurement of all components of velocity gradient tensor using 8-sensor hot wire probe Invited

    Eiji Hishikawa, Shoma Yano, Tatsuo Ushijima, Hiroki Suzuki, Yutaka Hasegawa

    nagare   33 ( 6 )   479 - 482   2014.12

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  • 0714 Diverging/Converging Rotational Speed due to Nature of Torque Coefficient of a Wind Turbine with Constant Load Torque

    SUZUKI Hiroki, HASEGAWA Yutaka, USHIJIMA Tatsuo

    Fluids engineering conference ...   2014   "0714 - 1"-"0714-2"   2014.10

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    We discuss a factor characterizing diverging/converging rotational speed of small wind turbines by using a model differential equation. In this study, we focus on form of torque coefficient profile and discuss influence of this form on temporal variation of rotational speed.

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  • 0712 Research of Electric Power Regeneration using Automotive Cooling Fan : Influence of the Blade Solidity on the Wind Turbine Efficiency

    ODA Shinichi, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    Fluids engineering conference ...   2014   "0712 - 1"-"0712-3"   2014.10

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    The common target for vehicles has always been lowest fuel consumption. This paper deals with a new cooling fan for vehicle engine. This fan is used as a cooling fan at low speed or when the vehicle needs cooling. This fan is also used as a wind turbine and generates electric power at high vehicle speed. The fan has possibility to reduce the vehicle air resistance along with the regeneration of the electric power. We have developed a fan rotor that can operate as cooling fan with the same performance as the current fan and can operate also as a wind turbine at higher performance than the current fan. In this paper we report the influence of blade solidity on the wind turbine efficiency. The effectiveness of this proposal has been confirmed through the wind tunnel tests and CFD calculations.

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  • 416 Research of Electric Power Regeneration using Automotive Cooling Fan : Verification of CFD by flow measurement around blade and improvement of blade profile

    ODA Shinichi, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    2014 ( 63 )   "416 - 1"-"416-2"   2014.3

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  • 0422 Study on Evaporative Cooling system for Micro centrifugal compressor : Effects of Mist Introducing conditions

    ITO Ikuhisa, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo, KOJIMA Yoshihiro

    Fluids engineering conference ...   2013   "0422 - 01"-"0422-04"   2013.11

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    In order to improve efficiency of micro gas turbine system, it is imperative to decrease compression work for introducing air. The present study aims to develop an evaporative cooling system applied to a micro centrifugal compressor in order to reduce the compression work. In this paper, the effects of mist introducing conditions, such as mist quantity, mist introducing position in inlet duct, and inlet air temperature, are examined experimentally. In experimental setup, a number of ultrasonic vibrators, which can provide water mist of 3μm number mean diameter, are installed in the mist introducing duct. Experimental results show that the inlet air temperature has noted effects on compressor performance, through the effects on the quantity of evaporated water. The present evaporative cooling system has been proven quite valuable at high inlet temperature condition. There exists a trend that reduction rate of compression work depends strongly on the quantity of evaporated water, which is correlated with the inlet air temperature. Concerning about the introducing position of the mist in the duct, the introduction closer to compressor inlet seems to have a bit of advantage for improving compressor performance than the introduction far upstream.

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  • 0618 Wavelet analysis of spatial distribution of concentration in oscillating grid turbulence under constant mean concentration gradient.

    MORIKAWA Yuta, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2013   "0618 - 01"-"0618-02"   2013.11

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    In turbulent mixing of liquid, mixing takes place even in a smaller scale than the Kolomogorov length scale,because of high Schmidt number. In the present study, nearly isotropic turbulence at low Reynolds number was created by a pair of oscillating grid so that the Kolmogorov length can be large. Instantaneous spatial distribution of Rhodamine B concentration under constant mean concentration gradient was obtained by LIF (Laser-Induced Fluorescence) method of which spatial resolution is comparable to the Batchelor length. Noise contained in the measured data is removed by Wavelet decomposition/reconstruction. Some aspect of turbulent mixing within viscous convective range is also observed and further investigation is needed.

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  • 0503 Formulation of POD based low-dimensional model of turbulent plane Coutte flow.

    ITO Takuya, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2013   "0503 - 01"-"0503-02"   2013.11

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    In order to understand dynamics of low-frequency fluctuation of centerline velocity in plane turbulent Couette flow, Proper Orthogonal Decomposition (POD) is applied to the streamwise velocity profile in the wall-normal direction to obtain the empirical orthogonal function. Instantaneous velocity profile was obtained by rake of 9ch hot wire anemometry. The 1st and 3rd modes are responsible to velocity fluctuation at the centre of the channel. Dynamical model is formulated using the POD eigenfunctions to project a simplified Navier-Stokes equation onto POD modes, since only single component of velocity was measured. We will report the performance of low-dimensional POD-based dynamical model in the meeting.

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  • 0616 Development of eight-sensor hot wire probe for velocity gradients and its application to measurement of cylinder wake.

    SAITO Ryota, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2013   "0616 - 01"-"0616-02"   2013.11

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    We have developed new multi-sensor hot wire probe in order to measure all components of velocity gradient simultaneously. Simultaneous measurement of all components of velocity gradient is important for understanding dynamics of non-linear energy transfer. Our probe uses less sensors (8 wires) than the previously proposed 12-sensor probe so that size of probe can be more compact. The new probe was tested against wake of circular cylinder.

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  • 1027 Study on aerodynamic characteristics of turbine blade in wing-stroke motion(Effects of operating conditions)

    SATO Ryosuke, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    Fluids engineering conference ...   2013   "1027 - 01"-"1027-05"   2013.11

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    Wing-stroke type wind turbine generates electricity by stroking its blades, whose pitch angle changes periodically and passively, during stroke motion. With respect to the aerodynamic and mechanical characteristics of the wing-stoke turbine, there are many unsolved questions. A series of experiments on a small scale model have been conducted aiming to find operational condition which can obtain high efficiency of the turbine. Effects of pitch angle, stroke period and tip speed ratio of the blade on power and torque coefficients have been examined in this paper.

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  • 1026 Research of electric power regeneration using automotive cooling fan

    ODA Shinichi, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    Fluids engineering conference ...   2013   "1026 - 01"-"1026-03"   2013.11

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    The common target for vehicles has always been lowest fuel consumption. This paper deals with a new cooling fan for vehicle engine. This fan is used as a wind turbine and generates electric power at high vehicle speed. Also this fan is used as a cooling fan at low speed or when the vehicle needs cooling. The fan can also reduce the vehicle air resistance along with the regeneration of the electric power. We have developed a fan rotor that can operate as cooling fan with the same performance as the current fan and can operate also as a wind turbine at higher performance than the current fan. The effectiveness of this proposal has been confirmed through the wind tunnel tests and CFD calculations.

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  • DNS Study on Boundary Layer with Heat Transfer affected by Disturbances Created by a Grid and Small Cubes

    S. Xia, Y. Ito, K. Nagata, Y. Sakai, H. Suzuki, O. Terashima, T. Hayase

    Proc. of the 10th International Conference on Flow Dynamics (ICFD)   126-127   2013.11

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    November 25-27, 2013<br />
    Sendai International Center

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  • Reynolds-Number Dependency of Budget of Kinetic Energy and Turbulence Structure in Plane Jet

    N. Wu, Y. Sakai, K. Nagata, H. Suzuki, O. Terashima, T. Hayase

    Proc. of the 10th International Conference on Flow Dynamics (ICFD)   76-77   2013.11

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    November 25-27, 2013<br />
    Sendai International Center

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  • PRODUCTION AND TRANSPORT OF TURBULENT KINETIC ENERGY IN FRACTAL-GENERATED TURBULENCE Reviewed

    Inaba Takuto, Nagata Kouji, Sakai Yasuhiko, Suzuki Hiroyuki, Terashima Osamu, Suzuki Hiroki

    Jets, wakes and separated flows : proceedings of International Conference on Jets, Wakes and Separated Flows, ICJWSF   2013   1065_1 - 1065_4   2013.9

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  • 239 POD analysis of the burst signal appearing in Couette-Poiseuille turbulent flow

    ITO Takuya, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    2013 ( 62 )   149 - 150   2013.3

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  • 222 Measurement of microscopic scalar mixing in turbulence generated by oscillating grids under constant concentration gradient

    MORIKAWA Yuta, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    2013 ( 62 )   115 - 116   2013.3

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  • 423 Numerical analysis for field of flow around an airfoil using a collocated grid

    WATANABE Masaya, SUZUKI Hiroki, HASEGAWA Yutaka, USHIJIMA Tatsuo

    2013 ( 62 )   251 - 252   2013.3

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  • 419 Experimental study on aerodynamic characteristics of turbine blade in wing-stroke motion

    SATO Ryosuke, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo

    2013 ( 62 )   243 - 244   2013.3

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  • 416 Study on Evaporative Cooling system for Micro centrifugal Compressor

    ITO Ikuhisa, HASEGAWA Yutaka, SUZUKI Hiroki, USHIJIMA Tatsuo, KOJIMA Yoshihiro

    2013 ( 62 )   237 - 238   2013.3

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  • 221 Study on scalar mixing in regular and fractal grid turbulence by PIV-PLIF measurement

    HOSHINO Koichi, NAGATA Kouji, ITO Yasumasa, SUZUKI Hiroki, TERASHIMA Osamu

    The Proceedings of Conference of Tokai Branch   2013 ( 0 )   113 - 114   2013

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    DOI: 10.1299/jsmetokai.2013.62.113

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  • G402 Improvement of the PIV using an Interpolation Technique

    SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko, HASEGAWA Yutaka, USHIJIMA Tatsuo

    Fluids engineering conference ...   2012   491 - 492   2012.11

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    We attempt to improve accuracy of PIV analysis by introducing an interpolation technique for brightness distribution. This work numerically realizes decrease in uncertainty by introducing an interpolation technique. We select a Fourier interpolation technique as a interpolation technique. First, we confirm that the Fourier interpolation technique can interpolate original brightness distribution well. Then, the effectiveness of this proposed method is quantitatively investigated by using a Monte-Carlo simulation. The results show that uncertainty is decreased by applying the Fourier interpolation technique when diameter of particle image is sufficiently large.

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  • 0113 Measurement of spatial distribution of wake turbulence statistics behind Sierpinski tetrahedron

    KATO Yuki, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2012   29 - 30   2012.11

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    Turbulence generated through the Sierpinski tetrahedra was investigated. The Sierpinski tetrahedron is a model of foliage distribution of crown tree, and fractal dimesion of both strucures is two. Velocity ditribution in the cross section corresponds to the arrangement of the smallest tetraheda. Skewness of velocity fluctuation is positive in the lower speed region and vice versa, while flatness lies between 2.8 and 3.0 across the section. Taylor microscale based Reynolds number obtained was much greater than the corresponding grid generated turbulence. And the inertial subrange was observed.

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  • 0110 Decay characteristics of wake turbulence behind various type of 3 D fractal structure

    ITO Kai, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2012   23 - 24   2012.11

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    Turbulence generated through 3 dimensional Fractal structure object was investigated.Four variations of the Sierpinski tetrahedra were chosen to examine the effect of lacunarity,arrangement and number of iteration on the turbulence decay. Turbulence generated by all structures decays with power law after initial development. However, the original Sierpinski tetrahedron and the one with different lacunarity showed exponential decay and accelerate the decay in the farther downstream.

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  • 0903 Study on Wake Inertia Effects of HAWT Rotor

    TANIGUCHI Yuta, SUZUKI Hiroki, HASEGAWA Yutaka, USHIJIMA Tatsuo

    Fluids engineering conference ...   2012   337 - 338   2012.11

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    The operational control of the wind turbine,such as blade pitch control and/or speed control of the turbine rotor,is one of the useful methods to reduce the temporal variation of wind turbine output.For the optimization of the control method,the response of turbine performance has to be clarified with respect to the changes in operational condition.We have examined the effects of wake inertia on the response of turbine performance when the blade pitch and the rotor speed are temporally changed under stationary inflow condition by using numerical calculation.The calculated results provide relationship between the responses of the wake-induced velocities on the rotor plane and the aerodynamic performance.

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  • 0141 Measurement of scalar statistics of round turbulent jet using line scan camera

    NARA Tatsuya, USHIJIMA Tatsuo, SUZUKI Hiroki, HASEGAWA Yutaka

    Fluids engineering conference ...   2012   85 - 86   2012.11

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    Radial distribution of scalar statistics in a low Reynolds number turbulent round jet with high Schmidt number (Sc=2300) is investigated. Evolution of instantaneous scalar distribution is measured by the LIF method using line scan camera. Statistics up to the fourth order show good agreement with the previous researchers' results. The frequency spectra obtained from scalar timeseries exhibit the -1 power scaling.

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  • Experimental Study on Scalar Mixing Layer in Regular/Fractal Grid Turbulence Invited

    Y. Sakai, K. Nagata, H. Suzuki, K. Hoshino, O. Terashima, Y. Ito

    Abstract of the 9th China-Japan Workshop on Turbulent Flows   17   2012.10

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    Oct 15-18, 2012<br />
    Xi&#039;an, China

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  • Direct Numerical Simulation of Fractal/Multiscale-Generated Turbulence Invited

    K. Nagata, Y. Sakai, H. Suzuki, O. Terashima

    Abstract of the 9th China-Japan Workshop on Turbulent Flows   26   2012.10

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    Oct 15-18, 2012<br />
    Xi&#039;an, China

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  • Direct Numerical Simulation of Eddy Diffusivity in a Plane Jet with a Second-Order Reaction Reviewed

    T. Watanabe, Y. Sakai, K. Nagata, H. Suzuki, Y. Ito, O. Terashima, T. Hayase

    Proc. of the International Conference on Simulation Technology 2012 (JSST 2012)   USB   paper no. JSST2012_OS5-11 (4pa   2012.9

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    JSST 2012<br />
    Date: Sep. 27-28, 2012<br />
    Venue: Port Island, Kobe

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  • Wind Tunnel Experiments on the Spatial Development of Fractal-generetad Turbulence Invited

    K. Nagata, Y. Sakai, Hiroyuki Suzuki, Hiroki Suzuki, O. Terashima

    Bulletin of the 2nd UK-Japan Bilateral Workshop and 1st ERCOFTAC Workshop on Turbulent Flows Generated/designed in Multiscale/fractal Ways: Fundamentals and Application   10   2012.3

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  • Numerical Simulation of Turbulence Genereted by the Multiscale Grid Invited

    H. Suzuki, K. Nagata, Y. Sakai, H. Toshiyuki, Y. Hasegawa

    Bulletin of the 2nd UK-Japan Bilateral Workshop and 1st ERCOFTAC Workshop on Turbulent Flows Generated/designed in Multiscale/fractal Ways: Fundamentals and Application   11   2012.3

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  • Development of Scalar Mixing Layer in Regular/fractal Grid Turbulence Invited

    Y. Sakai, K. Nagata, H. Suzuki, K. Hoshino, O. Terashima

    Bulletin of the 2nd UK-Japan Bilateral Workshop and 1st ERCOFTAC Workshop on Turbulent Flows Generated/designed in Multiscale/fractal Ways: Fundamentals and Application   18   2012.3

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  • 208 Investigation of the spatial development of velocity and scalar fields of turbulent plane jets using direct numerical simulation

    Wu Nannan, Sakai Yasuhiko, Nagata Kouji, Suzuki Hiroki, Sugimoto Daisuke, Terashima Osamu

    The Proceedings of Conference of Tokai Branch   2012 ( 0 )   _208 - 1_-_208-2_   2012

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    DOI: 10.1299/jsmetokai.2012.61._208-1_

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  • C124 Effects of freestream turbulence on heat transfer in a turbulent boundary layer

    Suzuki Hiroki, Nagata Kouji, Sakai Yasuhiko, Hayase Toshiyuki

    Procee[d]ings of Thermal Engineering Conference   2011   63 - 64   2011.10

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    The aim of this research is to investigate the effects of freestream turbulence (FST) in a main flow on turbulent structure and heat transfer in turbulent boundary layers (TBLs) by means of direct numerical simulation (DNS). The FST is generated by a turbulence-generating grid as in previous experimental studies. The results show that instantaneous and mean temperature profiles are affected by the FST in the outer region of the TBL. The rms temperature normalized by the friction temperature is enhanced by the FST.

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  • 311 DNS Study on the Spatial Evolution of the Velocity and Scalar Field of a Plane Jet

    SUGIMOTO Daisuke, SUZUKI Hiroki, SAKAI Yasuhiko, NAGATA Kouji

    2011 ( 60 )   "311 - 1"-"311-2"   2011.3

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  • 309 Experimental studies on high-Sc-number scalar turbulent transfer by means of time-resolved PIV and PLIF

    UKAI Ryota, SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko

    2011 ( 60 )   "309 - 1"-"309-2"   2011.3

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  • Reexamination of Fractal-Generated Turbulence Using a Smaller Wind Tunnel Invited

    K. Nagata, Y. Sakai, Hiroyuki Suzuki, Hiroki Suzuki

    Bulletin of the 1st UK-Japan Bilateral Workshop Turbulent Flows Generated/designed in Multiscale/fractal Ways: Fundamentals and Application   9   2011.3

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  • 366 Study on properties of turbulent boundary layers affected by large-scale free-stream turbulence

    TSUKUDA Saori, SUZUKI Hiroki, NAGATA Kouji, KITAYAMA Tomoyuki, SAKAI Yasuhiko, TERASHIMA Osamu

    The Proceedings of Conference of Tokai Branch   2011 ( 0 )   _366 - 1_-_366-2_   2011

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    DOI: 10.1299/jsmetokai.2011.60._366-1_

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  • Direct Numerical Simulation on the Effects of Free-stream Turbulence on an Isothermal Turbulent Boundary Layer

    Kouji Nagata, Yasuhiko Sakai, Hiroki Suzuki, Toshiyuki Hayase

    Proceedings of The Tenth International Symposium on Advanced Fluid Information and Transdisciplinary Fluid Integration   148 - 149   2010.11

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  • IMPROVEMENT OF THE DNS Of TURBULENT SCALAR TRANSFER USING THE FINITE DIFFERENCE METHOD WITH INTRODUCTION OF A HIGHER-ORDER DISCRETIZATION SCHEME TO THE DIFFUSION TERMS

    15 ( 2 )   753 - 756   2010.5

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  • 0140 Basic Characteristics of the High-Schmidt Number Scalar Mixing Layer by Multiscale Grid Turbulence

    UKAI Ryota, SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko, TERASHIMA Osamu

    The Proceedings of the Fluids engineering conference   2010 ( 0 )   85 - 86   2010

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

    High-Schmidt-number scalar mixing layers in the multiscale grid generated turbulence are experimentally investigated in a water channel by means of planar laser induced fluorescence (PLIF) technique and particle image velocimetry (PIV). The Reynolds number based on the effective mesh size and mean velocity is 2,500. Fluorescent dye (Rhodamine B; Schmidt number is about 2,100) is homogeneously premixed only in the upper stream, and therefore, the scalar mixing layer with an initial step profile develops downstream of the grid. Various turbulence quantities are evaluated and discussed.

    DOI: 10.1299/jsmefed.2010.85

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  • 0104 Direct numerical simulation of spatially developing turbulent plane jet with scalar transport

    SUZUKI Hiroki, SAKAI Yasuhiko, NAGATA Kouji, SUGIMOTO Daisuke

    Fluids engineering conference ...   2009   11 - 12   2009.11

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    Turbulence characteristics in the spatially developing turbulent plane jet with scalar transport is investigated by means of the direct numerical simulation (DNS). The Reynolds number based on the slit width d and exit mean velocity U_J, Re_d=U_Jd/ν, is 1,500. DNS results are in good agreement with the previous experiments. The coherent structure of plane jet is visualized.

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  • PIV and PLIF Measurement of Regular and Fractal Grid Turbulence with Scalar Transfer

    H. Suzuki, K. Nagata, Y. Sakai, R. Ukai

    Proc. of the Sixth International Conference on Flow Dynamics   154-155   2009.11

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  • 314 Direct Numerical Simulation of the Effects of External Turbulence on Turbulence Structure and Heat Transfer in a Turbulent Boundary Layer

    SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko, HAYASE Toshiyuki, KUBO Takashi

    2008 ( 57 )   211 - 212   2008.3

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  • 613 Direct Numerical Simulation of Turbulent Boundary Layer Downstream of Turbulence Generating Grid

    SUZUKI Hiroki, NAGATA Kouji, SAKAI Yasuhiko

    2007 ( 56 )   295 - 296   2007.3

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    Language:Japanese   Publisher:The Japan Society of Mechanical Engineers  

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Awards

  • Best Presentation Award of JCREN2018 (Paper No. IN_03)

    2018.12  

    Naru Itamura, Hiroki Suzuki, Shinsuke Mochizuki

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  • Best Presentation Award of JCREN2018 (Paper No. IN_01)

    2018.12  

    Kazunobu Nomura, Hiroki Suzuki, Shinsuke Mochizuki

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  • Young Scientist Award of the Japan Society of Mechanical Engineers

    2017.4  

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  • Best Presentation Award (46th National Heat Transfer Symposium of Japan)

    2009.6  

    Hiroki Suzuki

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  • 特別賞

    2009.5   第14回計算工学講演会グラフィクスアワード  

    鈴木博貴, 酒井康彦, 長田孝二, 久保貴

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  • 第22回数値流体力学シンポジウムベストCFDグラフィックスアワード

    2008.12   最優秀賞

    鈴木博貴, 長田孝二, 酒井康彦, 早瀬敏幸, 久保貴

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  • Best Presentation Award (45th National Heat Transfer Symposium of Japan)

    2008.5  

    Hiroki Suzuki

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  • 第12回計算工学講演会グラフィクスアワード

    2007.5   優秀賞

    鈴木博貴, 長田孝二, 酒井康彦, 早瀬敏幸, 久保貴

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Research Projects

  • 高レイノルズ数空力予測の精度向上を目指した衝撃波/境界層干渉の先進画像計測

    2022.04 - 2026.03

    日本学術振興会  科学研究費補助金 基盤研究(B) 

    河内俊憲, 研究分担者, 鈴木博貴

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  • 「基盤研究(C)」及び「若手研究」における独立基盤形成支援

    2021.07 - 2025.03

    日本学術振興会 科学研究費補助金 および 岡山大学 

    鈴木博貴

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  • Elucidation and modeling of non-equilibrium nonlocal isotropic turbulent diffusion phenomena by advanced static pressure fluctuation analysis

    2021.04 - 2025.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 21K03859) 

    Hiroki Suzuki

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  • Numerical/theoretical analysis on fluctuating power output of a small wind turbine focusing on Reynolds decomposition used to describe turbulence phenomena

    2020.11 - 2021.11

    The Sumitomo Foundation  - 

    Hiroki Suzuki

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  • ナノギャップ壁面せん断応力直接測定装置によるリブレット面の普遍的壁法則への挑戦

    2020.04 - 2024.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (B) (No. 20H02069) 

    望月信介, 研究分担者, 鈴木博貴

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  • Yamaguchi University New Choshu Five (Fellowship for Overseas Researchers)

    2019.04 - 2020.03

    Hiroki Suzuki

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    Authorship:Principal investigator  Grant type:Competitive

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  • Elucidation and analytical modeling for the impact of weak fluid acceleration on the decaying turbulence

    2018.04 - 2021.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 18K03932) 

    Hiroki Suzuki

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  • Elucidation and modeling for the high Peclet number turbulent diffusion and reactive phenomena near the turbulent/non-turbulent inteface

    2018.04 - 2021.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (B) (No. 18H01369) 

    Yasuhiko Sakai, Co-Investigator, Hiroki Suzuki

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  • Energy Exchange Mechanism on the Turbulent and non-turbulent Interface by means of Intermediate Mean Kinematic Energy Based on 5-component Decomposition

    2017.04 - 2020.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 17K06160) 

    Shinsuke Mochizuki, Co-Investigator, Hiroki Suzuki

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  • Study on the impact of weak fluid acceleration on the decay characteristics of homogeneous turbulence

    2016.12

    TEPCO Memorial Foundation  Support for International Technological Interaction 

    Hiroki Suzuki

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    Authorship:Principal investigator  Grant type:Competitive

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  • Study on drag and wake of fractal object as crwon-tree model

    2015.04 - 2018.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 15K05792) 

    Tatsuo Ushijima, Co-Investigator, Hiroki Suzuki

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  • Numerical simulation study on wind-turbine array boundary layers

    2015.04 - 2017.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Young Scientists (B) (No. 15K17970) 

    Hiroki Suzuki

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  • 滑面および粗面壁上の壁面乱流とその中での熱輸送機構に及ぼす主流乱れの影響の解明

    2013.08

    The Nitto Foundation  Support for International Technological Interaction 

    Hiroki Suzuki

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  • Structure of multiscale/fractal generated turbulence and its application to innovative engineering devices

    2013.04 - 2017.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (B) (No. 25289030) 

    Koji Nagata, Co-Investigator, Hiroki Suzuki

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  • Study on control optimization of rotor speed and blade pitch for horizontal axis wind turbine

    2013.04 - 2016.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 25420115) 

    Yutaka Hasegawa, Co-Investigator, Hiroki Suzuki

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  • Experimental study on decay and energy transfer mechanism of turbulence generated by fractal structure

    2012.04 - 2015.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Scientific Research (C) (No. 24560190) 

    Tatsuo Ushijima, Co-Investigator, Hiroki Suzuki

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  • Effect of freestream turbulence on wall turbulent flows over multi-scale rough walls

    2012.04 - 2014.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for Young Scientists (B) (No. 24760133) 

    Hiroki Suzuki

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  • 乱流境界層の構造とスカラー拡散機構に及ぼす境界層外乱れと体積力の影響

    2011.04 - 2011.10

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for JSPS Fellows (No. 11J05430) 

    Hiroki Suzuki

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  • 速度多点同時計測とDNSによる乱流境界層に及ぼす境界層外乱れと浮力の影響の解明

    2008.04 - 2010.03

    Japanese Ministry of Education, Culture, Sports, Science and Technology  Grant-in-Aid for JSPS Fellows (No. 08J08010) 

    Hiroki Suzuki

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Class subject in charge

  • Fourier and Laplace Transforms (2021academic year) 1st semester  - 月3,月4,木1,木2

  • Fourier and Laplace Transforms (2021academic year) 1st semester  - 月3,月4,木1,木2

  • Research Works for Mechanical and Systems Engineering 1 (2021academic year) Prophase  - その他

  • Research Works for Mechanical and Systems Engineering 2 (2021academic year) Late  - その他

  • Fluid Mechanics I (2021academic year) 1st semester  - 火3,火4,水3,水4

  • Fluid Mechanics I (2021academic year) 1st semester  - 火3,火4,水3,水4

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