Direct numerical simulation of effects of a micro-ramp on a hypersonic shock wave/boundary layer interaction

A direct numerical simulation study is performed on the hypersonic shock wave/boundary layer interaction controlled by using a microramp vortex generator (MVG). The mean structures around the microramp generator are obtained and the comparison on the shock structures and surface flow patterns is made between cases with and without the MVG. The evolution of the vortical structures in the wake of the MVG is described and the evolution process is found to be similar to that in a supersonic flow. The detailed three-dimensional voritcal structures are presented. Furthermore, the effects of the MVG on the shock wave/boundary layer interaction are investigated. The results show that the heat flux and friction after the interaction have been reduced apparently by the MVG. Such reduction is mainly caused by the flow pattern near the reattachment and the alteration of the vortical structures after the interaction.