Faculty Profiles - ISHIHARA Takashi

MISC - ISHIHARA Takashi

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

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

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

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

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

BIOPHYSICAL JOURNAL 103 ( 4 ) 711 - 718 2012.8

Language：English Publisher：CELL PRESS

The actomyosin interaction plays a key role in a number of cellular functions. Single-molecule measurement techniques have been developed to study the mechanism of the actomyosin contractile system. However, the behavior of isolated single molecules does not always reflect that of molecules in a complex system such as a muscle fiber. Here, we developed a simple method for studying the kinetic parameters of the actomyosin interaction using small numbers of molecules. This approach does not require the specialized equipment needed for single-molecule measurements, and permits us to observe behavior that is more similar to that of a complex system. Using an in vitro motility assay, we examined the duration of continuous sliding of actin filaments on a sparsely distributed heavy meromyosin-coated surface. To estimate the association rate constant of the actomyosin motile system, we compared the distribution of experimentally obtained duration times with a computationally simulated distribution. We found that the association rate constant depends on the sliding velocity of the actin filaments. This technique may be used to reveal new aspects of the kinetics of various motor proteins in complex systems.

DOI： 10.1016/j.bpj.2012.07.014

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

Teraji Atsushi, Ishihara Takashi, Kaneda Yukio

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

Language：English Publisher：The Japan Society of Mechanical Engineers

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

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

Atsushi Teraji, Takashi Ishihara, Yukio Kaneda

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

Language：English

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

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

31 ( 3 ) 241-244 - 244 2012

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

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

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

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

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

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

Improvement of Reality of CG Motion Pictures by Hydrodynamic Effects Reviewed

Takashi Ishihara, Yuji Hattori

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

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

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

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

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

Atsushi Teraji, Takahiro Morikawa, Takashi Ishihara, Yukio Kaneda

ICDERS 2011 Proceedings - ( - ) - 2011

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

中西崇仁, 石原卓

日本物理学会講演概要集 65 ( 2 ) 289 - 289 2010.8

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

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

Nagare 29 ( 2 ) 73-78 - 78 2010.4

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

Gotoh Takashi, Ishihara Takashi, Kaneda Yukio

2010 127 - 127 2010

Language：Japanese

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

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

Ishihara Takashi, Kato Masayuki, Kaneda Yukio

2010 117 - 117 2010

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

ISHIHARA Takashi, KATO Masayuki, KANEDA Yukio

Fluids engineering conference ... 2009 123 - 124 2009.11

Language：Japanese Publisher：The Japan Society of Mechanical Engineers

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

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

Takahashi Kazuki, Ishihara Takashi

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

乱流の大規模DNSデータ解析：速度差の統計の距離依存性とレイノルズ数依存性

石原卓

九州大学応用力学研究所研究集会報告, 20ME-S6 176 2009.5

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

Yukio Kaneda, Takashi Ishihara

TURBULENCE AND INTERACTIONS 105 55 - 76 2009

Language：English Publishing type：Research paper, summary (national, other academic conference) Publisher：SPRINGER-VERLAG BERLIN

A review is given of the basic idea and some results of data-analysis of recent high-resolution direct numerical simulations (DNSs) of incompressible turbulence in a periodic box with up to 4096(3) grid points. Emphasis is put on the possible universality of small-scale statistics in turbulence at high Reynolds numbers. An analogy of turbulence with systems at or near thermal equilibrium state is also discussed.

DOI： 10.1007/978-3-642-00262-5_3

Web of Science

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Direct Numerical Simulation of Turbulent Boundary Layers Using a Fringe Method

Kato Masayuki, Ishihara Takashi, Kaneda Yukio

2009 27 - 27 2009

Language：Japanese

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

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

Koji Morishita, Takashi Ishihara, Yukio Kaneda

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

Language：English Publishing type：Research paper, summary (national, other academic conference)

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

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