剪切流turbulence中大尺度涡产生的数值研究
Numerical study of large-scale vorticity generation in shear-flow turbulence
摘要：
本文采用随机剪切流湍流模拟方法，研究了剪切周期域中垂直于剪切面方向上大尺度流态的自发产生。基于对由此产生的大尺度速度相关性的分析，有人认为这种现象背后的机制可能是Elperin，Kleeorin和Rogachevskii在2003年开创的平均涡发电机效应（Phys. Rev. E 68，016311）。这种效应是基于涡粘性张量的各向异性。它的一个组成部分可能能够通过作用于平均流的流向组成部分来补充横流平均流。切变反过来又通过作用于横流平均流以产生更强的流向平均流来闭合环路。的涡流粘度的对角线分量被发现是的顺序的均方根湍流速度除以波数的能量携带的漩涡。
英文摘要：
Simulations of stochastically forced shear-flow turbulence in a shearing-periodic domain are used to study the spontaneous generation of large-scale flow patterns in the direction perpendicular to the plane of the shear. Based on an analysis of the resulting large-scale velocity correlations it is argued that the mechanism behind this phenomenon could be the mean-vorticity dynamo effect pioneered by Elperin, Kleeorin, and Rogachevskii in 2003 (Phys. Rev. E 68, 016311). This effect is based on the anisotropy of the eddy viscosity tensor. One of its components may be able to replenish cross-stream mean flows by acting upon the streamwise component of the mean flow. Shear, in turn, closes the loop by acting upon the cross-stream mean flow to produce stronger streamwise mean flows. The diagonal component of the eddy viscosity is found to be of the order of the rms turbulent velocity divided by the wavenumber of the energy-carrying eddies.
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