摘要
运用流体计算软件CFX模拟了静止方柱和圆柱在不同雷诺数条件下(层流区、亚临界区、超临界区)的绕流问题.采用层流和SST湍流模型,基于二维纳维斯-斯托克斯方程(N-S方程),计算得到了相应的绕流参数:斯托罗哈数St和阻力系数Cd.将绕流参数与现有文献的绕流结果进行比较,验证了该数值模拟方法的正确性.分析了雷诺数Re对绕流参数的影响,获得了方柱和圆柱的St、Cd随Re的变化规律.通过对比方柱和圆柱的绕流参数,发现较大雷诺数时方柱的斯托罗哈数远低于圆柱的斯托罗哈数,但同时其阻力系数却高于圆柱的阻力系数,而在圆柱绕流中明显存在的阻力危机现象在方柱绕流中并不明显.
The flow over a static square cylinder and a static circular cylinder under different Reynolds number（Re）（laminar region,subcritical region,supercritical region） is simulated using CFX.The parameters of flow over a static cylinder： Strouhal number St,drag coefficient Cd are obtained with laminar and SST turbulence model based on Navier-Stokes equation.Through comparing presented results with available literature results,the correctness of this numerical simulation method is verified.The influence of Re on parameters is analyzed,and the law of St,Cd following Re is given.Comparing St,Cd of presented results of square cylinder and circular cylinder,it is found that the St of square cylinder is far lower than that of circular cylinder under higher Re,while that the Cd of the former is larger than that of the latter.Meanwhile,the obvious phenomenon of drag crisis existed in flow over a circular cylinder does not show apparently in flow over a square cylinder.
出处
《三峡大学学报（自然科学版）》
CAS
2012年第1期41-45,共5页
Journal of China Three Gorges University：Natural Sciences
关键词
边界层
阻力系数
斯托罗哈数
阻力危机
boundary layer
drag coefficient
Strouhal number
drag crisis
