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。
Abstract: By virtue of a code for solving aeroelastic problems developed by the authors based on loosely coupled method, vortex-induced vibration of an elliptical cylinder at high Reynolds number is simulated. The ratio of major to minor axis for the elliptical cylinder approaches to 2, and the incident flow is perpendicular to major axis. Numerical results show that the lateral vibration dominates the vibration of the cylinder although the streamwise and lateral dynamic parameters are different. The vortex-induced vibration of the cylinder with two degree-of -freedoms exists streamwise and lateral lock-in phenomena, and with the increasing of the reduced 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.