Eddy Formation behind Circular Cylinders
Eddy Formation behind Circular Cylinders
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DOI：
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发表时间：
1971-06
影响因子：
2.4
通讯作者：
A. Laird
中科院分区：
文献类型：
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作者：
A. Laird
阐述了横流中圆柱体尾流中旋涡形成的原因和方式。势流理论被用来证明在实际流动中占主导地位的各种条件下剪切层和旋涡的行为所产生的基本趋势。圆柱体后面的涡旋交替脱落，形成卡门涡列，这是由边界层产生的涡量和这些层由于其所含的涡量而产生的不稳定性的组合。势流理论模型对海崖圆柱体的流动给出了有用的预测。剪切层很容易被流动扰动所瓦解。在圆柱绕流的势流理论模拟中，边界层中的涡量对其它区域的影响显然可以用分布的有限涡的影响来近似。
Explanations of how and why eddies form in the wake of a cylinder in cross-flow are offered. Potential flow theory is used to demonstrate basic tendencies resulting from the behavior of shear layers and vortices under a variety of conditions prevailing in actual flows. Eddies shed alternately behind a cylinder and form Karman vortex streets, as a combination of vorticity emanating from the boundary layers and the instability of these layers due to the vorticity which they contain. Potential flow theory modeling gives useful predictions of flow about bluff cylinders. Shear layers are readily disintegrated by flow disturbances. The effects of vorticity in boundary layers on other regions apparently can be approximated by the effects of distributed finite vortices in the potential theory modeling of flow about cylinders.