由周期性无限 vortex 列引起的耦合模态-非模态相互作用
Coupled Modal-Nonmodal Interactions Due to Periodic, Infinite Train of Convecting Vortices (TCV)
AI总结:
本文研究了由周期性无限 vortex 列引起的强来流激发,揭示了模态与非模态成分的耦合相互作用,解释了剪切层上涡扰动导致的严重遭遇机制。
摘要:
在湍流过渡过程中,事件要么遵循模态或非模态路线,或者两者的组合。在此,我们报告了对由一系列运动 vortex(TCV)引起的强来流激发的计算研究。对于这种 TCV 激励,我们展示了模态和非模态成分的强烈相互作用,导致扰动的显著增长。我们提出这种机制是由于底层剪切层上的卷吸涡扰动引起的严重遭遇的原因。
英文摘要:
Events during transition to turbulence either follow modal or non-modal routes, or combinations of the two. Here, we report a computational investigation of strong freestream excitation caused by a train of convecting vortices. For this TCV excitation, we show a strong interaction of modal and non-modal components causing a spectacular growth of disturbances. We propose this as the mechanism for the severe encounters due to convective vortical disturbances on the underlying shear layer.
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