Vortex shedding suppression for flow over a circular cylinder near a planeboundary

In this study, the Navier-Stokes equations and the pressure Poisson equatio n for two-dimensional time-dependent viscous flows are solved with a finite difference method in a curvilinear coordinate system. With this numerical procedure, the vortex shedding flow past a circular cylinder near a wall is investigated. The flow is calculated for a broad range of gap ratios for d ifferent Reynolds numbers ranging from 80 to 1000. Based on the numerical s olutions, the vortex shedding is observed using various methods, and the me chanism for the vortex shedding suppression at small gap ratios is analyzed . The critical gap ratio at which the vortex shedding is suppressed is iden tified at different Reynolds numbers. (C) 2000 Elsevier Science Ltd. All ri ghts reserved.