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

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.

Key words:aeroelastic problem; loosely coupled method; vortex-induced vibration; lock-in; squarecylinder