高雷诺数条件下二维方柱涡激振动的数值模拟

Numerical Simulation of Vortex-Induced Vibration for a Square Cylinder at High Reynolds Number

摘要:

利用作者编制的基于松耦合方法的求解气动弹性问题的数值模拟程序,计算了二维方柱在高雷诺数条件下,的横向涡激振动.结果表明:随着折减风速的增加,在特定折减风速条件下,方柱的涡激振动出现锁定现象;由于方柱的自然振动频率和涡激振动系统的旋涡脱落频率的相互作用,涡激振动出现拍的现象;随着折减风速的增加,涡激振动系统的旋涡脱落模式从异相2S (2-single)变化到同相2S,即相位转换现象.该文还将计算结果和文献中的计算结果进行了比较和评价.

Abstract:

This paper presents a study of the lateral vortex-induced vibration of a two-dimensional square cylinder at high Reynolds number with the code for the aeroelastic problems based on the loosely coupled method, which is programmed by the authors. The results show that with the increasing of the reduced velocity, the lock-in phenomenon occurs at a particular reduced velocity. The beat phenomenon is also detected due to the interaction of the natural frequency for the cylinder and the natural vortex shedding frequency of the vortex-induced vibrating system. With the increasing of the reduced velocity, the vortex shedding mode of the system changes from out-of-phase 2 s to in-phase 2 s, which is the so-called phase switch phenomenon. The results are also compared with the disseminated results.