Simulation of Streamwise Vortices on Turbulent Hypersonic Ramps

Purpose of this investigation is the simulation of separated turbulent ramp flow as a simple generic model for re-entry vehicle flaps under three dimensional disturbances. Parameter variations of cross flow, disturbance intensity and wave length of the disturbances are tested. Comparison with wind tunnel data of the Ludwieg tube facility in Gottingen (RWG) was used to validate the numerical code and getting a deeper insight into the flow topology. The dependence of the vortices from surface disturbances and a tendency of circular vortex shape at reattachment has been shown experimentally and numerically in good agreement. Finally the damping influence of cross flow in the separation region was investigated.