绕方柱流脉动压力场的大涡模拟

详细信息

Large eddy simulation of pulsating pressure field for flow around a square cylinder

摘要: 采用有限差分法，对雷诺数为22000的绕方柱流的脉动压力场进行了三维大涡模拟。采用时间分解算子法，将N－S方程分为对流分步、扩散分步和传播分步，再分别进行计算，在大涡模拟中，用两层模型处理Smagorinsky模型在近壁区模拟结果的发散问题。计算的压力场以及阻力系数、升力系数和Strouhal数均与试验结果较为吻合。
- 大涡模拟绕方柱流压力场 Smagorinsky模型
Abstract: D large eddy simulation (LES) of the pulsating field for flow around a square cylinder with a Reynolds' number of 22 000 is carried out by use of finite difference method. By using the split operator method, the N S equation is divided into three steps, namely convection, diffusion and propagation steps, to be calculated separately. A two layer model is employed to deal with divergence near the wall of Smagorinsky model. The calculated pressure field, lifting coefficient and Strouhal number accord with the experimental results.
- large eddy simulation,flow around a square cylinder,pressure field,Smagorinsky model