Direct numerical simulation of homogeneous stratified rotating turbulence

被引：0
作者：
O. Iida
S. Tsujimura
Y. Nagano
机构：
[1] Nagoya Institute of Technology,Department of Mech. Eng.
来源：
Theoretical and Computational Fluid Dynamics | 2005年 / 19卷
关键词：
Homogeneous turbulence; Stable stratification; Rotation;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effects of the Prandtl number on stratified rotating turbulence have been studied in homogeneous turbulence by using direct numerical simulations and a rapid distortion theory. Fluctuations under strong stable-density stratification can be theoretically divided into the WAVE and the potential vorticity (PV) modes. In low-Prandtl-number fluids, the WAVE mode deteriorates, while the PV mode remains. Imposing rotation on a low-Prandtl-number fluid makes turbulence two-dimensional as well as geostrophic; it is found from the instantaneous turbulent structure that the vortices merge to form a few vertically-elongated vortex columns. During the period toward two-dimensionalization, the vertical vortices become asymmetric in the sense of rotation.
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页码：441 / 460
页数：19
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