Numerical study on the suppression of the vortex-induced vibration of a circular cylinder by acoustic excitation

In order to investigate the possibility of suppressing flow-induced vibration of structures by applying periodic excitation such as a sound wave to the flow around the structures, numerical simulations of the vortex-induced vibration of a circular cylinder were carried out when a periodic velocity excitation was applied to the flow at two locations on the cylinder surface. A FEM based on the ALE formulation was employed to simulate the vortex-induced vibration, with the time integration being carried out by the predictor corrector method. The results revealed that the excitation with the transition wave frequency is the most effective in changing the flow characteristics around the cylinder and the characteristics of the vortex-induced vibration. These changes appear to be caused by the promotion of the vortex growth in the early vortex formation behind the cylinder.