Streamwise vortices in plane Couette flow
Streamwise vortices in plane Couette flow
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平面库埃特流中的流向涡流
DOI：
10.1063/1.868565
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发表时间：
1995
影响因子：
4.6
通讯作者：
F. Daviaud
中科院分区：
文献类型：
--
作者：
O. Dauchot;F. Daviaud
对各种流动的实验观察得出结论，在这些流动的失稳过程中存在流向涡。在平面库埃特流中，存在线性剪切流，这种结构从未被观察到过，因为这种流动具有线性稳定性。通过在其中心平面上引入一根与展向平行的金属丝，对流动进行了轻微的修改。然后就发生了不稳定。它产生沿展向周期性间隔的流状结构。这些结构被认为是一对反向旋转的流向涡旋。这封信描述了这些旋涡的行为对雷诺数的依赖，以及它们的不稳定如何导致湍流。
Experimental observations of various flows have led to the conclusion of the existence of streamwise vortices involved in the destabilization process of these flows. In the plane Couette flow, a linear shear flow, such structures have never been observed, because of the linear stability of the flow. The flow was slightly modified by introducing a wire in its central plane, parallel to the spanwise direction. A destabilization then occurs. It generates streamwise structures periodically spaced in the spanwise direction. These structures have been identified as pairs of counter‐rotating streamwise vortices. This Letter characterizes the dependence on the Reynolds number of the behavior of these vortices and how their destabilization leads to turbulence.