Secondary Instability of Plane Channel Flow to Subharmonic Three-Dimensional Disturbances
Secondary Instability of Plane Channel Flow to Subharmonic Three-Dimensional Disturbances
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DOI：
10.1063/1.864226
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发表时间：
1983-04
影响因子：
4.6
通讯作者：
T. Herbert
中科院分区：
文献类型：
--
作者：
T. Herbert
提出了一种线性二次不稳定机制，该机制导致壁面剪切流中出现次谐波三维扰动。这种不稳定性源于小而有限振幅的托尔米恩-施利希廷波对剪切流中涡度的周期性重新分布。这种不稳定性的低阈值幅度和其他特征与实验一致，并且可以阐明各种模糊的观察结果。
A linear secondary instability mechanism is presented that leads to the occurrence of subharmonic three‐dimensional disturbances in wall‐bounded shear flows. The instability originates from the periodic redistribution of vorticity in the shear flow by small but finite‐amplitude Tollmien–Schlichting waves. Low threshold amplitudes and other characteristics of this instability are consistent with experiments and may elucidate various obscure observations.