Abstract
Adding a splitter plate at the wake centreline of a bluff body is an efficient passive technique of controlling fully developed vortex shedding.In the present study,unsteady turbulent flow around a circular cylinder with a splitter plate is numerically studied with the finite-volume method in high Reynolds number range of 1.5×104Re8×104.The fluid flow is modelled using the(Reynolds-averaged Navier-Stokes,RANS) equations together with the one-equation Spalart-Allmaras turbulence model.The effect of a 1 diameter-splitter plate on vortex-induced vibration of circular cylinder and near-wake flow characteristics is investigated.Numerical results are compared with that for cylinder without plate.The results indicate that the amplitude for the cylinder-plate combination increases with the increase of Re and the frequency is lower than that for the no-plate-cylinder.In addition,2S vortex structure is observed for the cylinder-plate body and 2P for the cylinder without plate.The splitter plate inhibits communication between the two shear layers on either side of the cylinder and the suppression of vortex-induced vibration is enhanced as the velocity decrease.
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