A review of Pressure behavior after a Backward-Facing Step

The Purpose of this study is a pressure approach which is unusual in the literature of three-dimensional backward facing-step. First a generic pressure coefficient is analyzed to characterize the different parts and reason of its behavior. It observed that a dome like pressure contour happens after reattachment where maximum pressure occurs after step. Another future observed is a plane inside recirculation where pressure is uniform along channel's width and it is where pressure coefficient has maximum derivative. Another point introduced here is where pressure behaviors like channel. Finally effect of Reynolds number and expansion ratio is considered.