不同雷诺数下圆柱绕流仿真计算.pdf

30 12 武 汉 理 工 大 学 学 报 Vol. 30 No. 12 2008 12 JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY Dec. 2008 1 1 2 2 詹 昊 , 李万平 , 方秦汉 , 李龙安 ( 1. , 430074; 2. , 430050) : 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 用大涡模型( Largeeddy imulat ion) , 不可压缩的 NavierStoke 方程, 计算了三维圆柱绕流的气动力特性系统分析了 5 6 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 10 Re 10 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 : 圆柱绕流; 大涡模型; 三维仿真计算 : U 448. 2 15 : A : 2008) 120 12904 Numerical Simulation of the Flo Around a Circular Cylinder at Varies Reynolds Number 1 1 2 2 ZHAN H ao , L I Wanp ing , FANG Qinhan , L I Longan ( 1. School of Civil Engineering and M echanic , Huazhong Univer it y of Science and T echnology , Wuhan 430074, China; 2. China Zhongtie M ajor Bridge Reconnai ance De ign In titute Co Ltd, Wuhan 430050, China) Abstract: Flow over a cylinder i a fundamental fluid mechanic problem of practical importance. T hi paper pre ent the cal culation of characteri t ic of a rigid ingle circular cyclinder in two or three dimen io nal incompre ible uniform cro flow by u ing Lamber or Larg e- eddy imulatio n met hod of FL U ENT . T he numerical imulation focu ed on inv e t igating t he characteri 7 tic of the drag coefficient , Strouhal number and the ty pical flow pattern with the Reynold number from 1 to 10 . It i found that