DNS of a Laminar Separation Bubble Affected by Free-Stream Disturbances
DNS of a Laminar Separation Bubble Affected by Free-Stream Disturbances
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DOI：
10.1007/978-1-4020-2313-2_23
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
J. Wissink;W. Rodi
中科院分区：
文献类型：
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作者：
J. Wissink;W. Rodi
对层流、分离流受不同程度的自由流扰动影响进行了一系列直接数值模拟。自由流扰动被发现触发了开尔文-亥姆霍兹不稳定性。随着自由流扰动强度的增加，分离气泡的尺寸明显减小，重新附着的位置向上游移动。在下游，近壁湍流只能非常缓慢地采用“正常”的湍流边界层统计数据。
A series of direct numerical simulations of laminar, separating flow affected by various levels of free-stream disturbances has been performed. The free-stream disturbances were found to trigger a Kelvin-Helmholtz instability. The size of the separation bubble was found to be significantly reduced and the location of re-attachment was found to move upstream when the level of free-stream disturbances was increased. Downstream, the near-wall turbulent flow only very slowly assumes “normal” turbulent boundary layer statistics.