Lower branch coherent states in shear flows: transition and control.
Lower branch coherent states in shear flows: transition and control.
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剪切流中的下分支相干态：转变和控制。
DOI：
10.1103/physrevlett.98.204501
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发表时间：
2007
影响因子：
8.6
通讯作者：
F. Waleffe
中科院分区：
文献类型：
--
作者：
Jue Wang;J. Gibson;F. Waleffe
平面Couette流中下支相干态的渐近结构由O(1)条纹、O(R(-1))流向卷曲和形成临界层的弱正弦波组成，对于较大的雷诺数R，高次谐波可以忽略不计。这些不稳定的下支态在所有的雷诺数下似乎都有一个不稳定的本征值。这些结果表明，低支相干态控制着向湍流的转变，它们可能成为新的湍流预防策略的目标。
Lower branch coherent states in plane Couette flow have an asymptotic structure that consists of O(1) streaks, O(R(-1)) streamwise rolls and a weak sinusoidal wave that develops a critical layer, for large Reynolds number R. Higher harmonics become negligible. These unstable lower branch states appear to have a single unstable eigenvalue at all Reynolds numbers. These results suggest that lower branch coherent states control transition to turbulence and that they may be promising targets for new turbulence prevention strategies.