Vorticity dynamics in turbulence growth

被引：0
|
作者：
Paolo Orlandi
Sergio Pirozzoli
机构：
[1] Università di Roma “La Sapienza”,Dipartimento di Meccanica e Aeronautica
来源：
Theoretical and Computational Fluid Dynamics | 2010年 / 24卷
关键词：
Turbulence; Energy spectra; Vortex dynamics; 47.27.eK; 47.32.C-; 47.27.Cn;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The mechanisms of vorticity amplification in the formation of turbulence are investigated by means of direct numerical simulations of the Navier–Stokes equations with different initial conditions and Reynolds numbers. The simulations show good universality of the enstrophy evolution, that occurs in two stages. The first stage is dominated by the effect of vortex stretching, and it finishes with a k−3 power-law energy spectrum. The second stage is dominated by the action of viscosity on the small scales, and it finishes with a Kolmogorov k−5/3 energy spectrum.
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页码：247 / 251
页数：4
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