The DDES turbulence model was used to numerically calculate the flow around a cylinder with complex subcritical Reynolds number(Re=3 900)with different grid conditions.The influence of different structural/unstructured hybrid methods on the solution accuracy of large separated flows was analyzed from aspects such as model scale control,turbulent structure capture ability and flow field statistical integration.The calculation results show that when the unstructured grid is installed in the far field,the flow field shows good turbulence spectrum generation ability,and more high-frequency-small-scale vortex structures are captured,at the same time,the calculated physical quantities such as drag coefficient values and recirculation zone length match the experimental values well;when the unstructured grid is used in the separation area,the flow field dissipates greatly,and the calculation accuracy is relatively low.
关键词
网格划分/圆柱绕流/钝体绕流/分离涡模拟/数值模拟
Key words
grid generation/flow around cylinder/flow around blunt body/separated vortex simulation/numerical simulation
维普
万方数据