Predicting turbulence in flows with strong stable stratification
Predicting turbulence in flows with strong stable stratification
复制标题
预测具有强稳定分层的流动中的湍流
DOI：
10.1063/1.2204987
复制
发表时间：
2006
影响因子：
4.6
通讯作者：
S. D. B. Kops
中科院分区：
文献类型：
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作者：
D. Hebert;S. D. B. Kops
高分辨率的直接数值模拟被用来了解如何湍流可以预测流受到强烈的稳定分层。据观察，剪切不稳定性是湍流的主要原因，在模拟中，这支持了推导的弗劳德-雷诺数缩放来预测在这种流动状态下的湍流。据发现，当水平速度的自相关长度被用作长度尺度的弗劳德数和雷诺数，那么长度尺度，弗劳德数，和雷诺数都演变，理论表明。一个平流长度尺度的基础上的动能和耗散率被发现是没有实际用途的流动特性。最后，观察到Riley和de Bruyn Kops的弗劳德-雷诺数参数与常用的浮力雷诺数非常相似。这表明，一个基于剪切的方法来参数化稳定层结下的湍流，而不是比的LE…
High resolution direct numerical simulations are used to understand how turbulence can be predicted in flows subject to strong stable stratification. It is observed that shear instabilities are the predominant cause of turbulence in the simulations, which supports the derivation of a Froude-Reynolds number scaling to predict turbulence in this flow regime. It is found that when the autocorrelation length of the horizontal velocities is used as the length scale for the Froude and Reynolds number then that length scale, the Froude number, and the Reynolds number all evolve, as theory suggests. An advection length scale based on the kinetic energy and its dissipation rate is found not to be of practical use for characterizing the flow. Finally, it is observed the Froude-Reynolds number parameter of Riley and de Bruyn Kops is very similar to the commonly used buoyancy Reynolds number. This suggests that a shear-based approach to parametrizing turbulence under stable stratification, rather than the ratio-of-le...