Direct numerical simulation of flow separation control in incompressible turbulent flow over backward-facing step controlled by traveling wave created by body force

Abstract

Direct numerical simulations of incompressible turbulent flows over a backward-facing step are performed. To control the flow separation, a body force distribution in form of a traveling wave is given on top of the step. In this study, we investigate the effects of control parameters of the traveling wave. In the controlled flow, a time-averaged reattachment distance is affected by the control, e.g., when the wave travels in the downstream direction, the time-averaged reattachment point moves in the upstream direction and the pressure recovery occurs on the upstream side.