The velocity distribution of barotropic turbulence
The velocity distribution of barotropic turbulence
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正压湍流的速度分布
DOI：
10.1063/1.1288517
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发表时间：
2000
影响因子：
4.6
通讯作者：
A. Provenzale
中科院分区：
文献类型：
--
作者：
A. Bracco;J. LaCasce;C. Pasquero;A. Provenzale
本文研究了正压湍流中速度和速度梯度分布的统计特性。当雷诺数足够大时，涡核外的速度分布为非高斯分布，其特征完全由相干涡诱导的远场特性决定。由于涡核中有序流动的空间速度相关性，相干涡内部的速度梯度总是非高斯的，并且在足够大的雷诺数下，在背景湍流中也变得非高斯。
We study the statistical properties of the velocity and velocity gradient distributions in barotropic turbulence. At large enough Reynolds number, the velocity distribution becomes non-Gaussian outside the vortex cores, and its characteristics are completely determined by the properties of the far field induced by the coherent vortices. The velocity gradients are always non-Gaussian inside coherent vortices, due to the spatial velocity correlations associated with the ordered flow in the vortex cores, and become non-Gaussian also in the background turbulence at large enough Reynolds number.