斜、直圆柱绕流的CFD模拟  

Numerical simulation for flow around perpendicular and oblique circular cylinders

作　　者：李寿英[1] 顾明[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《空气动力学学报》2005年第2期222-227,共6页Acta Aerodynamica Sinica

基　　金：国家创新研究群体基金资助项目(50321003);国家自然科学基金(50178049);上海市科委科技攻关项目(036511002);教育部"高等学校骨干教师计划"资助项目.

摘　　要：采用CFD软件CFX5.5对直圆柱和斜圆柱绕流进行数值模拟,计算了直、斜置圆柱的阻力系数、升力系数、周向平均压力系数及其脉动压力系数的均方根值,并与试验结果进行了比较。计算表明,斜圆柱绕流与直圆柱绕流有很大的差异:斜圆柱绕流的平均阻力系数减小,平均升力系数不等于零,升力系数的频域除包含有传统的卡门涡脱频率外,还包含有许多低频成份。A numerical simulation for flow around perpendicular and oblique circular cylinders is carried out using CFX5.5. The mean and RMS values of drag and lift and pressure coefficients are obtained and then compared with the experimental results from other literatures. The differences between the flow around perpendicular and oblique circular cylinders are investigated in detail. The mean drag coefficients of oblique circular cylinder are generally lower than those of the perpendicular one; and the mean lift coefficient of oblique circular cylinder is not equal to zero. From the power spectrum density functions of the fluctuating lift coefficients of the oblique circular cylinder it can be also found that the lift includes not only the frequency of the Karman vortex shedding but also many low frequency components.

关 键 词：斜、直圆柱绕流 CFD模拟 阻力系数 升力系数 压力系数 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]