小雷诺数下圆柱绕流数值模拟

Numerical Simulation of Circular Flow around A Cylinder at Small Reynolds Number

应用计算流体力学软件Fluent对小雷诺数(20≤Re≤300)下的圆柱绕流进行仿真计算,采用有限体积法、层流模型求解不可压缩的N-S方程,计算了二维圆柱绕流的水动力学特性。分析尾涡的形态随着雷诺数不断增加的变化情况,并研究升阻力因素、St数及壁面分离角等参数随雷诺数的变化。

The computational fluid dynamics software Fluent was used to simulate the flow around a cylinder at low Reynolds number(20≤Re≤300).Using finite volume method and laminar flow model to solve the incompressible N-S equation,the hydrodynamic characteristics of two-dimensional cylinder around-flow were calculated.The variation of the shape of the trailing vortex with the increase of Reynolds number was analyzed,and the changes of parameters such as lift and resistance factors,St number and wall separation angle with Reynolds number were studied.