Energetics and mixing in buoyancy-driven near-bottom stratified flow

Energetics and mixing in buoyancy-driven near-bottom stratified flow
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浮力驱动的近底部分层流中的能量和混合

DOI:
10.1017/jfm.2019.184
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发表时间:
2019
影响因子:
3.7
通讯作者:
Sarkar, Sutanu
Sarkar, Sutanu
中科院分区:
工程技术2区
文献类型:
--
作者:
Puthan, Pranav;Jalali, Masoud;Chalamalla, Vamsi K.;Sarkar, Sutanu

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通过模型问题的数值模拟来检查近底部对流驱动流中的湍流和混合:当剪切和对流不稳定同时发生时,在具有倾角 ) 间隔的斜坡上出现静态不稳定扰动,并且能量损失率近似恒定。研究发现,以对流驱动的湍流为主的初始阶段的混合效率比广泛使用的 0.2 值要高得多(超过 0.5)。目前边界处对流翻转问题的长时间混合效率在 0.24 到 0.3 之间变化。
Turbulence and mixing in a near-bottom convectively driven flow are examined by numerical simulations of a model problem: a statically unstable disturbance at a slope with inclination ) interval when both shear and convective instability occur, and the energy loss rate is approximately constant. The mixing efficiency during the initial period dominated by convectively driven turbulence is found to be substantially higher (exceeds 0.5) than the widely used value of 0.2. The mixing efficiency at long time in the present problem of a convective overturn at a boundary varies between 0.24 and 0.3.
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