Shear-Layer Manipulation of Backward-Facing Step Flow with Forcing: A Numerical Study

By means of experimental and numerical analysis, turbulent flow separation has long been extensively studied. This is not only due to its interesting intrinsic flow features for fundamental studies, but also for its significance in engineering applications in relation to, among others, turbulent heat transfer, drag and noise generation. In the presence of sharp edges, protuberances, curvature surfaces andor adverse pressure gradient, boundary layer separation is usually accompanied with free shear layer detaching from the wall surface and being characterized by consequent vortex motions and flow recirculation. Flow control of boundary layer separation has usually targeted to delay the separation onset in order to suppress the separation.