涡方法分析并列圆柱的旋涡脱落现象  

Numerical analysis of interactive vortex-shedding from a pair of circular cylinders in a transverse arrangement by random vortex method

作　　者：周志勇[1] 陈艾荣[1] 项海帆[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》2003年第1期38-46,共9页Acta Aerodynamica Sinica

基　　金：国家自然科学基金重大项目(编号59895410);教育部骨干教师基金联合资助

摘　　要：利用快速离散涡方法及流场可视化技术分析二维粘性不可压缩均匀流中并列圆柱体的旋涡脱落现象,识别作用在圆柱上的气动力及旋涡脱落频率。使用边界元方法及引入一个新颍的涡量边界条件计算表面涡量,利用系数影响矩阵技术获得无网格方法,采用自适应快速多极子算法快速计算涡元速度。数值算例再现了不同间距并列圆柱体的同步同相旋涡脱落、同步反相旋涡脱落、尾流的不对称性及间隙流的半稳定性等现象,数值结果与早期实验结果吻合得很好。The random vortex method is applied to the twodimensional characteristics flow and strouhal number and interactive aerodynamic forces associated with flows pas t a pair of cylinders. An efficient boundary element method and novel vorticity boundary conditionboundary method with integral representation, are used to de termine the surface vorticity. An efficient influence matrix technique and a fas t adaptive multipole algorithm are used to obtain a meshfree method. It is fou nd that the behaviour such as synchronized inphase vortexshedding, synchroni zed a ntiphase vortex shedding and asymmetric wake patterns are wellknown characte ristics for flows past arrangements of two circular cylinders.The bistable natur e of the asymmetric vortex shedding as well as the intermittently drifting from upper cylinde to lower cylinder is confirmed by flow visualization methods.

关 键 词：离散涡方法 涡量边界条件 并列圆柱 旋涡脱落 

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]