A model for subharmonic resonance within wavepackets in unstable boundary layers
摘要：
In recent experiments on the growth of localized disturbances in a Blasius boundary layer, Medeiros & Gaster (1999a, b) observed that the development of nonlinear effects depends markedly on the initial phase of their imposed disturbance. Here, a simple explanation of this phenomenon is proposed. Because the disturbance is localized in space and time, it has a spread of wavenumbers and frequencies: among these are components which can initiate a pair of resonant subharmonic waves with well-determined phase, which are then amplified by the familiar three-wave resonance mechanism. The amplitude attained after some time is strongly phase-dependent, consistent with the experimental observations.
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关键词：
boundary element method breaking ocean waves non-linear surface waves numerical wave tank potential flow three-dimensional flows
DOI：
10.1088/1468-5248/2/1/007
被引量：
年份：
2001
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