Onset of the second wake: Dependence on the Reynolds number
Onset of the second wake: Dependence on the Reynolds number
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DOI：
10.1063/1.1486450
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发表时间：
2002-05
影响因子：
4.6
通讯作者：
P. Vorobieff;D. Georgiev;M. Ingber
中科院分区：
文献类型：
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作者：
P. Vorobieff;D. Georgiev;M. Ingber
第二个尾迹转捩发生在海崖体的远尾迹中。这种转捩破坏了近尾流中产生的Benard-von Karman涡街，并产生特征频率较低的二次涡街。我们描述了雷诺数为50<Re<800时，在近二维肥皂膜流中第二尾迹的开始。圆柱体与第二尾流起始点之间的无量纲距离随雷诺数的增加而减小，与Re−1/2幂律一致。我们的二维远尾迹数值模拟与实验符合得很好。
The second wake transition occurs in the far wake of a bluff body. This transition destroys the Benard–von Karman vortex street originating in the near wake and produces a secondary vortex street with a lower characteristic frequency. We characterize the onset of the second wake for Reynolds numbers 50<Re<800 in a nearly two-dimensional soap film flow. The dimensionless distance between the cylinder and the onset of the second wake decreases with Reynolds number consistently with Re−1/2 power law. Our two-dimensional far-wake numerical simulations are in good agreement with the experiment.