The influence of far field stratification on shear-induced turbulent mixing

The influence of far field stratification on shear-induced turbulent mixing
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远场分层对剪切引起的湍流混合的影响

DOI:
10.1017/jfm.2021.755
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发表时间:
2021
影响因子:
3.7
通讯作者:
Lewin S
Lewin S
中科院分区:
工程技术2区
文献类型:
--
作者:
Lewin S

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本文比较了在高雷诺数下,在最小初始梯度Richardson数不同的情况下,Kelvin-Helmholtz不稳定性(KHI)在两类分层剪切流中的湍流特性,其中背景密度分布由线性函数或双曲正切函数给出,特别是讨论了分层湍流中翻转“索普尺度”的相关性。最后,我们比较了各种经验模型参数化用于计算diapycnal扩散在海洋学的背景下,认为瞬态流,如KHI引起的湍流,简单的模型,涉及的“年龄”的湍流事件,其混合效率可以产生合理的稳健的混合估计。
We compare the properties of the turbulence induced by the breakdown of Kelvin–Helmholtz instability (KHI) at high Reynolds number in two classes of stratified shear flows where the background density profile is given by either a linear function or a hyperbolic tangent function, at different values of the minimum initial gradient Richardson number in terms of characteristic length scales, in particular discussing the relevance of the overturning ‘Thorpe scale’ in stratified turbulent flows. Finally, we compare a variety of empirical model parameterizations used to compute diapycnal diffusivity in an oceanographic context, arguing that for transient flows such as KHI-induced turbulence, simple models that relate the ‘age’ of a turbulent event to its mixing efficiency can produce reasonably robust mixing estimates.
DOI: --
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