On Radiating Instabilities and Resonant Overreflection
On Radiating Instabilities and Resonant Overreflection
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关于辐射不稳定性和共振过度反射
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
M. Weissman
中科院分区：
文献类型：
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作者：
M. McIntyre;M. Weissman
摘要 剪切不稳定性会导致波辐射到远离不稳定位置的地方。这种现象及其相反的极端，即不稳定的俘获，只能通过缓慢增长的不稳定性的线性理论来描述和区分。为了描述辐射的强不稳定性，需要进行实验室和数值研究。线性理论可以更好地描述有点类似的“共振过度反射”现象，对于恒定的入射波，其特征是线性而不是指数增长。来自剪切层的持续辐射或过度反射的能量预算不一定涉及从剪切层附近净去除能量。
Abstract Shear instabilities can result in waves being radiated far from the seat of instability. This phenomenon, and its opposite extreme, the trapping of instabilities, can be described and interdistinguished by linear theory for slowly growing instabilities only. To describe strong instabilities which radiate, laboratory and numerical studies are needed. Linear theory can better describe the somewhat similar phenomenon of “resonant overreflection,” which for a constant incident wave is characterized by linear rather than exponential growth in fine. The energy budget of sustained radiation, or overreflection, from a shear layer does not necessarily involve net removal of energy from the neighborhood of the shear layer.