Turbulence transition in stratified atmospheric and oceanic shear flows: Reynolds and Prandtl number controls upon the mechanism
Turbulence transition in stratified atmospheric and oceanic shear flows: Reynolds and Prandtl number controls upon the mechanism
复制标题
分层大气和海洋剪切流中的湍流转变：雷诺数和普朗特数对机制的控制
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
W. Peltier
中科院分区：
文献类型：
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作者：
A. Mashayek;W. Peltier
我们详细分析了在适合大气和海洋的高雷诺数和普兰特数下，二次不稳定性在分层剪切流向湍流转变中的作用。我们的重点是最近的一系列观察表明，在这个实验室无法访问的政权过渡机制的显着变化。我们的结果表明，这两个无量纲参数的过渡机制的联合依赖性。详细讨论了剪切向列对流不稳定性、驻点不稳定性和剪切不稳定性的主要转捩机制。
We provide detailed analyses of the role of secondary instabilities in the transition to turbulence of stratified shear flows at the high Reynolds and Prandtl numbers appropriate to the atmosphere and ocean. Our focus is upon a series of recent observations suggestive of a marked change in the mechanism of transition in this laboratory inaccessible regime. Our results demonstrate the joint dependance of the transition mechanism on these two nondimensional parameters. We discuss the primary transition mechanisms of shear aligned convective instability, stagnation point instability and shear instabilities of the braid in detail.