低雷诺数圆柱绕流特性的数值模拟

Numerical simulation of flow characteristics past a circular cylinder at low Reynolds numbers

为分析圆柱绕流近场水动力学特性随雷诺数变化规律,采用分区结构化网格及层流模型求解不可压缩Navier-Stokes方程,对低雷诺数圆柱绕流进行数值模拟.在未施加任何扰动的条件下获得圆柱绕流2种特殊绕流场;分析壁面压力因数、平均阻力因数、脉动阻力、升力因数、Strouhal数及边界层分离点等参数随雷诺数变化规律,结果与实验研究吻合较好.

Both the multi-blocks structured meshes and Laminar model were adopted to solve the Navier-Stokes equations for incompressible flow.The flow past a circular cylinder at low Reynolds numbers up to 300 was simulated by using FLUENT.Two special flows flied around the circular cylinder were obtained without any disturbance.The numerical simulation focused on investigating the hydrodynamic characteristic represented by the mean surface pressure,mean drag coefficient,fluctuating drag and lift coefficient,the Strouhal frequency of vortex shedding and the separation angle.The computation results are validated against measurement data,which provide basis for the research of flow past a circular cylinder and vortex-induced vibration.