Intermittency of Energy Dissipation in High-Resolution Direct Numerical Simulation of Turbulence(Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid mechanics)
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概要
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The statistics of energy dissipation rate ε^^〜 in turbulence and the ratio α_n≡ε_<n+1>/ε_n is studied using the data of direct numerical simulations of incompressible turbulence with up to 2048^3 grid points, where ε_n is the average of ε^^〜 over a sphere of radius r_n with r_n/r_<n+1>=const>1. The data do not support the well-known assumption of the scale-independence of the statistics of α_n nor that of the statistical independence of α_n's from each other, but suggest the existence of a scale range where the correlation between log α_n and log α_<n+k> is insensitive to n. A simple zero-cumulant approximation compatible with these observations yields an estimate of the moment <(ε_n)^p> for given <log α_n>'s, in good agreement with the simulations for approximately |p|≤4.
- 社団法人日本物理学会の論文
- 2007-07-15
著者
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Morishita Koji
Department Of Computational Science And Engineering Graduate School Of Engineering Nagoya University
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KANEDA Yukio
Department of Applied Physics,Faculty of Engineering,Nagoya University
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Kaneda Yukio
Department Of Applied Physics Faculty Of Engineering Nagoya University
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Kaneda Yukio
Nagoya Univ. Nagoya
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