涡对与物体的相互作用研究

A Study on the Interaction Between a Vortex Pair and a Body

本文从非定常形式的N-S方程出发,采用有限差分法数值模拟了入射涡对与圆柱及翼型相互作用的流场结构,旨在分析讨论其复杂的非定常流动现象,如二次涡及三次涡的形成、多涡配对、非定常分离及剪切层的演化等,以及不同的物形及涡对与物体间不同的相对位置对流场结构的影响。此外,文中还通过分析物面压力分布随时间的变化来探讨非定常分离的流动特性。

A computational investigation of the interaction of a vortex pair approaching a body (including a circular cylinder and an airfoil respectively) is carried out by using a difference method to solve the Navier-Stokes equations. The emphasis of this study is put on the complicated unsteady flow phenomena, such as formation of secondary vortices, multi-vortex pairing, unsteady separation and evolution of shear layer. Furthermore, the characteristics of unsteady separation is discussed for analyzing the change of the pressure distributions on the body surface. The computational results are in good agreement with experimental visualizations.