Real and Pseudo Kolmogorov Constant

概要

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Two possible reasons are analyzed to explain why the Kolmogorov constant, obtained by direct numerical simulations and large-eddy numerical simulations con-ducted in recent years, is a pseudo Kolmogorov constant which is appreciably higher than the real (or theoretical) Kolmogorov constant. Firstly, the viscous effect dies away slowly as the wavenumber decreases and persists outside the narrow range near the Kolmogorov wavenumber. Secondly, the resolution of the numerical simulations is limited (e. g. 128^3) and the observed k^<-5/3> range is narrow, so long-range triad inter-actions are excluded. In order to obtain the real Kolmogorov constant as well as to observe the Kolmogorov inertial subrange in numerical simulations, the resolution of simulations must be much higher than 128^3.
社団法人日本物理学会の論文
1993-03-15