Two-Dimensional VIV Simulation of a Cylinder Close to a Wall with High Reynolds Number by Overset Mesh

Abstract

The numerical study of vortex-induced vibration (VIV) of a near-wall cylinder, as well as the impacts of the wall on VIV response, is presented. The Reynolds number for a cylinder near a wall is lower than that of an isolated cylinder when the max vibration amplitude occurs. The max vibration amplitude of the cylinder near a wall is less than that of an isolated cylinder. Moreover, the vortex shedding observed from a wall interacts with the vortex shedding emanating from a cylinder, weakening it. As a near-wall cylinder enters the lock-in region, the vortex shedding from a wall interact with that from the cylinder, which promote separation of the wall boundary layer and alter the wake vortex structure.