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应用计算流体力学软件Fluent对不种雷诺数下(亚临界区、超临界区、极超临界区)的圆柱绕流进行仿真计算。采用大涡模型(Large-eddy simulation),不可压缩的Navier-Stokes方程,计算了三维圆柱绕流的气动力特性。系统分析了涡脱落形态,阻力系数,Strouhal数随雷诺数的变化情况。数值计算结果表明流动呈明显的三维特性,在105≤Re≤106时出现阻力危机现象,从亚临界区、超临界区到极超临界区,涡脱落形态由规则到不规则再到规则。
The computational fluid dynamics software Fluent was used to simulate the circular flow around a cylinder without Reynolds number (subcritical, supercritical, supercritical). Large-eddy simulation and incompressible Navier-Stokes equations were used to calculate the aerodynamic characteristics of 3D cylindrical flow. The variation of vortex shedding, drag coefficient and Strouhal number with Reynolds number was systematically analyzed. The numerical results show that the flow shows obvious three-dimensional characteristics. The resistance crisis occurs when 105≤Re≤106. From the subcritical and supercritical regions to the extremely supercritical region, the vortex shedding forms from rule to rule to rule.