Direct numerical simulation of homogeneous stratified rotating turbulence |
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Authors: | O Iida S Tsujimura Y Nagano |
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Institution: | (1) Department of Mech. Eng., Nagoya Institute of Technology, Nagoya, 466-8555, JAPAN |
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Abstract: | 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.
Communicated by S. Obi
PACS 47.55.Hd |
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Keywords: | Homogeneous turbulence Stable stratification Rotation |
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