正方形排列四圆柱绕流的数值模拟

Numerical Simulation of Cross-flow around Four Cylinders in a Square Configuration

采用有限体积方法,对攻角为45°正方形排列的4个等直径圆柱的二维绕流进行了数值模拟.得出了Re=100以及不同间距比下的涡量场分布和四圆柱升/阻力系数以及St数等空气动力参数的变化规律.结果表明：在绕流过程中,圆柱2受到的干扰力很大,可能会导致严重的震动.当L/D在4~5之间变化时,升力系数、阻力系数、DC？、LC？和St数都会发生较大的变化,说明此处存在流型的转变.

A two-dimensional finite volume method is used to perform a numerical simulation of cross-flow around four equal diameter cylinders in a square configuration at ？ ？45？. The vorticity field distribution and the variation law of aerodynamic parameters,such as mean drag and lift coefficients and Strouhal number,etc. of four cylinders in various spacing ratios at Re=100 are achieved. The results show that the disturbing force acting on the downstream cylinder 2 is great and could lead to serious vibration on cylinder 2 in the process of the cross-flow. When L/D varies from 4 to 5,some primary parameters,such as CL,CD,DC？,LC？ and St have noticeable changes,which indicates that the transformation of flow patterns exists here.