基于DES方法的三维圆柱受迫振动数值模拟

基于OpenFOAM平台对雷诺数3900下的三维固定圆柱绕流和雷诺数30000下的三维圆柱受迫振动进行数值模拟,对湍流的模拟采用SA-DDES离散涡模型.针对三维圆柱绕流问题,采用PISO算法耦合求解速度-压力场,对圆柱绕流的基础参数如St数、平均阻力系数和平均升力系数等与试验进行了比较,结果吻合良好.针对三维圆柱受迫振动问题,采用PIMPLE算法耦合求解速度-压力场,对不同频率下振幅比为0.3的阻力系数、尾涡形态进行了计算,阻力平均系数与实验值相比吻合较好.

3D numerical simulation for forced oscillating cylinder based on DES method

This paper use SA-DDES turbulence model to simulate 3D flow around a cylinder at subcritical Reynolds number 3900 and 3D forced oscillating cylinder at Reynolds number 30000. The PISO algorithms is used to solve equations of velocity and pressure for 3D flow around a cylinder. The computational parameters, such as Strouhal number, time-averaged drag coefficient and so on, show good agreement with the experiment. The PIMPLE algorithms is used to solve equations of velocity and pressure for 3D forced oscillating cylinder, The variations of drag coefficients with the non-dimensional oscillation amplitudes of 0.3 are analyzed also with the wake modes. The time-averaged drag coefficient show good agreement with the experiment.