Longitudinal Vortex Structure of the Backward Facing Step Flow with Vortex Generator Jets (Turbulent Flow Characteristics)

The paper presents the turbulent flow characteristics of a separating shear layer associated with the corotating longitudinal vortices introduced by the vortex generator jets (VGJs) over a backward facing step. The turbulent flow structure is measured by the hot-wire anemometer. The two-dimensional time averaged velocity profile in the separating shear layer downstream of the step is observed, while the turbulent kinetic energy and Reynolds stress have the spanwise structure depending on the VGJ injection location. VGJ produces the primary and secondary vortices. The behavior of the primary and secondary vortices in the separating shear layer is also discussed.