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

被引:39
作者
Ishihara, T [1 ]
Kaneda, Y
Yokokawa, M
Itakura, K
Uno, A
机构
[1] Nagoya Univ, Grad Sch Engn, Dept Computat Sci & Engn, Nagoya, Aichi 4648603, Japan
[2] Natl Inst Adv Ind Sci & Technol, Grid Technol Res Ctr, Tsukuba, Ibaraki 3058568, Japan
[3] Japan Marine Sci & Technol Ctr, Earth Simulator Ctr, Kanazawa Ku, Yokohama, Kanagawa 2360001, Japan
关键词
spectrum; energy dissipation rate; enstrophy; pressure; high-resolution DNS;
D O I
10.1143/JPSJ.72.983
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The spectra of the squares of velocity quadratics including the energy dissipation rate epsilon per unit mass, the enstrophy omega(2) and the pressure p were measured using the data obtained from direct numerical simulations (DNSs) of incompressible turbulence in a periodic box with number of grid points up to 2048(3). These simulations were performed using the Earth Simulator computing system. The spectra for epsilon, omega(2) and p exhibited a wave number range in which the spectra scaled with the wave number k as proportional to k(-a). Exponent a for p was about 1.81, which is in good agreement with the value obtained by assuming the joint probability distribution of the velocity field to be Gaussian, while a values for epsilon and omega(2) were about 2/3, and very different from the Gaussian approximation values.
引用
收藏
页码:983 / 986
页数:4
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