Viscid–inviscid pseudo-resonance in streamwise corner flow
Viscid–inviscid pseudo-resonance in streamwise corner flow
复制标题
流向角流中的粘滞赝共振
DOI：
10.1017/jfm.2014.31
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
U. Rist
中科院分区：
文献类型：
--
作者：
O.T. Schmidt;U. Rist
The stability of streamwise corner flow is investigated by means of direct numerical simulation at subcritical Reynolds numbers. The flow is harmonically forced, and global modes are extracted through a spectral decomposition. Spatial amplification in the near-corner region is observed even though the flow is shown to be subcritical in terms of spatial linear theory. This apparent discrepancy is resolved by extending the local analysis to include non-modal effects. It is demonstrated that the amplification is a result of the interaction between two coexistent spatial transient growth processes that can be associated with different parts of the linear stability spectrum. A detailed investigation of the underlying mechanisms shows that the transient amplification behaviour is caused by pseudo-resonance between the inviscid corner mode, and different sets of viscous modes. By comparison with studies of other locally inflectional flows, it is found that viscid–inviscid pseudo-resonance might be a general phenomenon leading to selective noise amplification.
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