Numerical simulation of flow-induced vibration of a cylinder near a finite-length plate

Vortex-induced vibrations of an elastically mounted rigid cylinder in a gas flow near a finite-length plate were numerically studied. The mass ratio was equal to 1187.5, and the Reynolds number was varied from 192 to 384. The direct numerical simulation was performed in a two-dimensional approach in computational fluid dynamics code FlowVision by using Navier–Stokes equations for a gas flow and solid body motion equation for a vibrating cylinder. Different positions of the cylinder relative to the plate along and across the flow were investigated. It was obtained that the gap between the cylinder and the plate surface has the main effect on the oscillation if the gap is less than one diameter of the cylinder. Meanwhile, the streamwise distance between the plate trailing edge and the cylinder center affects the oscillation only if the gap is smaller than 0.167 of the diameter of the cylinder. In both cases, a lock-in was shifted to the higher range of speeds.