两自由度椭圆柱体涡激振动的数值模拟  

Numerical simulation for vortex-induced vibration of an elliptical cylinder with two degree-of-freedom

作　　者：方平治[1,2] 杜明侠[3] 顾明[1] 

机构地区：[1]同济大学,上海200092 [2]中国气象局上海台风研究所,上海200030 [3]华北水利水电学院,郑州450011

出　　处：《振动与冲击》2009年第1期51-55,共5页Journal of Vibration and Shock

基　　金：国家创新研究群体基金资助项目(50621062);国家自然科学基金重大研究计划重点项目(90715040);上海市博士后基金(07R214162)

摘　　要：利用作者编制的基于松耦合方法求解气动弹性问题的程序,对高雷诺数条件下椭圆柱体的涡激振动进行了数值模拟。椭圆柱体的长短轴比接近2,来流和长轴垂直。数值结果表明:尽管椭圆柱体在横向和流向的动力参数不同,结构振动仍以横向振动为主;和圆柱以及方柱一样,两自由度椭圆柱体的涡激振动同样存在流向锁定和横向锁定,并且随着折减风速的增大,旋涡脱落模式从异相2S变化为同相2S。By virtue of a code for solving aeroelastic problems developed by the authors based on a loosely coupled method,vortex-induced vibration of an elliptical cylinder at high Reynolds number was simulated.The ratio of major to minor axis for the elliptical cylinder approached to 2,and the incident flow was perpendicular to major axis.Numerical results showed that the lateral vibration dominates the vibration of the cylinder although the streamwise and lateral dynamic parameters are different.The vortex-induced vibration of an elliptical cylinder with two degree-of-freedom exists streamwise and lateral lock-in phenomena,and with increase in the reduced wind velocity,the vortex shedding mode switches from out-of-phase 2S to in-phase 2S,which are the same as those for circular and square cylinders.

关 键 词：松耦合方法 涡激振动 椭圆柱体 

分 类 号：O353.1[理学—流体力学]