对称椭圆钝体流动的分离准则
On a separation criterion for symmetric elliptic bluff body flows
摘要：
通过考虑壁面法向速度在雷诺数参数空间中的变化，导出了一个新的描述椭圆柱绕流分离起始的解析判据。结果表明，该准则可用于计算圆柱绕流经典问题的分离雷诺数Re_s，这是一个至今仍有争议和悬而未决的问题。应用上述准则，计算求解了二维纳维-斯托克斯方程，得到了Re_s的精确值。
英文摘要：
A new analytical criterion that captures the onset of separation of flow past elliptic cylinders is derived by considering the variation of the wall normal velocity in Reynolds number parameter space. It is shown that this criterion can be used to calculate the separation Reynolds number Re_s for the classical problem of flow past a circular cylinder, a contentious and unresolved issue till date. The two dimensional Navier-Stokes equations are solved computationally and an exact value of Re_s is obtained by applying the aforementioned criterion.
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