期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 72, 期 5, 页码 983-986出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.983
关键词
spectrum; energy dissipation rate; enstrophy; pressure; high-resolution DNS
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.
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