方柱绕流的数值模拟

使用计算流体力学CFD软件,模拟方柱在两种情况下的绕流.在第一种情况下,方柱位于流场的边壁,模拟不同雷诺数下流场的流线、压力分布,绘出方柱后面绕流形成的回流区长度随雷诺数的变化曲线并对其进行分析;在第二种情况下,方柱位于流场的中央,模拟Re=200的流场在不同时间步时的速度矢量图.描述了漩涡的生成、成长和脱落的全过程.两种情况下的计算结果与其他文献中的计算数值和试验数据相吻合.

Numerical Value Simulation of Flow Around a Square Cylinder

The flow field around a square cylinder in two cases was simulated with the application of Computational Fluid Dynamics software.In case one,the square cylinder located at a wall of the flow,the streamline and the pressure distribution of the flow field were simulated,the variation distribution of the length of reattachment region behind the square cylinder with the Reynolds number was painted and analyzed.In case two,the square cylinder located at the center of the flow field,velocity vectors of the steady flow was simulated at Re=200. The formation,development and the shed off of the vortex shedding behind the square cylinder were simulated.Results in both case are in agreement with the data from other literature and experiments.