Numerical and Experimental Studies on the Separation Topology of the MVG Controlled Flow at M=2.5

In this paper, the implicitly implemented LES method and fifth order bandwidth-optimized WENO scheme are used to make comprehensive studies on the separation topology of the MVG controlled flow at M=2.5 and Re θ θ θ θ =5760. Experiments are also made to verify the prediction of the computation. Analyses are conducted on three categories of the topology: the surface separation, cross-section separation and the three dimensional structure of the vortices. A complete description about the separation topology and a series of new findings are obtained. Among them, a pair of spiral point is first predicted by the computation and verified by the experiment. A corresponding new vortex model with 7 vortex tubes is presented also. Nomenclature MVG = micro ramp vortex generator M = Mach number Re θ = Reynolds number based on inlet momentum thickness LES = large eddy simulation DNS = direct numerical simulation 2-D = two dimensional 3-D = three dimensional SL = separation line AL = attachment line SP = spiral point SDP = saddle point HSDP = half saddle point NP = nodal point HNP = half nodal point DVL = diverged line CVL = converged line Subscript w = wall ∞ = free stream