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首页> 外文期刊>Journal of Fluid Mechanics >Instability of a stratified boundary layer and its coupling with internal gravity waves. Part 2. Coupling with internal gravity waves via topography
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Instability of a stratified boundary layer and its coupling with internal gravity waves. Part 2. Coupling with internal gravity waves via topography

机译：分层边界层的不稳定性及其与内部重力波的耦合。第2部分。通过地形与内部重力波耦合

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The aim of this paper is to show that the viscous shear instability identified in Part 1 is intrinsically coupled with internal gravity waves when a localized surface topography is present within a boundary layer. The coupling involves two aspects: receptivity and radiation. The former refers to excitation of shear instability modes by gravity waves, and the latter to emission of gravity waves by instability modes. Both physical processes are studied using triple-deck theory. In particular, the radiated gravity waves are found to produce a leading-order back action on the source, and this feedback effect, completely ignored in the acoustic analogy type of approach, is naturally taken into account by the triple-deck formalism. A by-product is that for certain incident angles, gravity waves are over-reflected by the boundary layer, i.e. the reflected waves are stronger than the incident waves.
机译：本文的目的是表明，当边界层内存在局部表面形貌时，第1部分中确定的粘性剪切不稳定性与内部重力波固有地耦合。耦合涉及两个方面：接受度和辐射。前者是指由重力波激发的剪切不稳定性模式，后者是指由不稳定性模式激发的重力波。这两个物理过程都使用三层理论进行了研究。特别是，发现辐射的重力波在声源上产生先导的反作用，而三层形式主义自然会考虑到这种反馈效果，在声学类比方法中完全被忽略了。副产品是对于某些入射角，重力波被边界层过度反射，即，反射波比入射波强。

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