研究者詳細 - 石原　卓

MISC - 石原　卓

分割表示 139 件中 81 - 100 件目／全件表示 >>

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

Y Yamazaki, T Ishihara, Y Kaneda

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 ( 3 ) 777 - 781 2002年3月

記述言語：英語出版者・発行元：PHYSICAL SOC JAPAN

The effects of wavenumber truncation on the direct numerical simulation (DNS) of incompressible turbulence at high Reynolds numbers using the Fourier spectral method were studied by comparing DNS fields with different truncation wavenumbers, K-max. The comparison suggests that the error due to truncation increases faster at higher wavenumbers, k, and the increase obeys a simple scaling law in the inertial subrange k much less than K-max. Some statistics, such as the energy and dissipation spectra, may remain insensitive to the error, even in the later period, provided that K(max)eta similar to 1 (eta is the Kolmogorov length scale), although DNS fields with different K-max are then essentially uncorrelated to each other.

DOI： 10.1143/JPSJ.71.777

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地球シミュレータによる乱流のUltra Simulation

金田行雄, 石原卓, 横川三津夫, 板倉憲一, 宇野篤也

九大応力研研究集会報告 14ME-S1 90-97 2002年

乱流の謎にせまる計算科学

後藤俊幸, 石原卓

パリティ 17 ( 10 ) 27-33 - 33 2002年

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

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

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

乱流のUltra Simulation

金田行雄, 石原卓, 横川三津夫, 板倉憲一, 宇野篤也

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

地球シミュレータ上の一様等方性乱流シミュレーション

横川三津夫, 斎藤実, 石原卓, 金田行雄

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

A312 乱流の非等方スペクトルとその Reynolds 数依存性

吉田恭, 石原卓, 金田行雄

日本流体力学会年会講演論文集 2002 388 - 389 2002年

記述言語：日本語出版者・発行元：日本流体力学会

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

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18pRJ-2 三次元乱流場における二粒子拡散について : 慣性小領域の有限性の影響

石原卓, 金田行雄

日本物理学会講演概要集 56 ( 2 ) 206 - 206 2001年9月

18pRJ-4 三次元乱流場の予測可能性 : 大規模渦のデータ同化の影響

林一樹, 石原卓, 金田行雄

日本物理学会講演概要集 56 ( 2 ) 206 - 206 2001年9月

Frequency shifts of Rossby waves in the inertial subranges of β-plane turbulence 査読

Takashi Ishihara, Yukio Kaneda

Physics of Fluids 13 ( 8 ) 2338 - 2349 2001年8月

乱流の慣性小領域におけるラグランジュ統計

石原卓, 金田行雄

京都大学数理解析研究所講究録 1226 ( 1226 ) 86-93 - 93 2001年7月

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

Y Kaneda, T Ishihara

PHYSICS OF FLUIDS 13 ( 5 ) 1431 - 1439 2001年5月

記述言語：英語出版者・発行元：AMER INST PHYSICS

A spectral closure analysis and numerical simulations suggest that there may be a class of two-dimensional turbulence in which the energy spectrum E(k) scales with the wave number k like E(k)=Ak(-3) in the enstrophy transfer range in accordance with the Kraichnan-Leith-Batchelor (KLB) spectrum, but the prefactor A is different from the KLB spectrum and depends in a nontrivial way on the flow conditions at large scales. (C) 2001 American Institute of Physics.

DOI： 10.1063/1.1359187

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30pZD-10 2次元乱流に於ける予測可能性とLES

山平倫道, 吉田恭, 石原卓, 金田行雄

日本物理学会講演概要集 56 ( 1 ) 294 - 294 2001年3月

30pZD-11 3次元等方性乱流の予測可能性の評価

藤田大志, 吉田恭, 石原卓, 金田行雄

日本物理学会講演概要集 56 ( 1 ) 294 - 294 2001年3月

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

T Ishihara, Y Kaneda

PHYSICS OF FLUIDS 13 ( 2 ) 544 - 547 2001年2月

記述言語：英語出版者・発行元：AMER INST PHYSICS

Numerical simulations of two-dimensional forced turbulence suggest that the enstrophy transfer range energy spectrum E(k) a little steeper than k(-3) is robust in the sense that it may be realized in a wave number range under different run conditions. It is shown that such energy spectra fit well E(k)=C(K)eta (2/3)k(-3)[ln(k/k(1))](-1/3), where C-K is a dimensionless constant, eta the enstrophy transfer rate per unit mass and k(1) a wave number at the bottom of the range. The simulations give C(K)approximate to1.9 in fairly good agreement with the existing theoretical estimates. (C) 2001 American Institute of Physics.

DOI： 10.1063/1.1336149

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Statistics of small-scale structure of homogeneous isotropic turbulence 査読

T Ishihara, Y Yamazaki, Y Kaneda

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