A Physical Interpretation of the Wind-Wave Instability as Interacting Waves
A Physical Interpretation of the Wind-Wave Instability as Interacting Waves
复制标题
风波不稳定性作为相互作用波的物理解释
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
E. Heifetz
中科院分区：
文献类型：
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作者：
J. Carpenter;A. Guha;E. Heifetz
摘要由风引起的海洋表面波增长的一种机制是通过剪切不稳定性，这一机制由 Miles 于 1957 年首次描述。这种风波不稳定性的物理解释是根据表面重力波与关键层内涡度扰动的相互作用提供的，临界层是气流中的近奇点，其中背景流速与表面重力波的速度相匹配。这种物理解释依赖于这样一个事实：垂直速度场在关键层上缓慢变化，而位移场和涡度场快速变化。认识到这一点可以构建对临界层涡度扰动的物理直观描述，该扰动可以通过简单的涡片模型来近似，然后可以通过临界层涡度与表面重力波的相互作用来捕获风波不稳定性的本质。然后将这个简单的模型扩展到考虑与涡度相关的...
AbstractOne mechanism for the growth of ocean surface waves by wind is through a shear instability that was first described by Miles in 1957. A physical interpretation of this wind-wave instability is provided in terms of the interaction of the surface gravity wave with perturbations of vorticity within the critical layer—a near-singularity in the airflow where the background flow speed matches that of the surface gravity wave. This physical interpretation relies on the fact that the vertical velocity field is slowly varying across the critical layer, whereas both the displacement and vorticity fields vary rapidly. Realizing this allows for the construction of a physically intuitive description of the critical layer vorticity perturbations that may be approximated by a simple vortex sheet model, the essence of the wind-wave instability can then be captured through the interaction of the critical layer vorticity with the surface gravity wave. This simple model is then extended to account for vorticity pert...
非 Boussinesq 状态下的分层剪切流不稳定性
影响因子：
4.6
作者：
Heifetz E
通讯作者：
Heifetz E