Unsteadiness of a Shock-Wave/Boundary-Layer Interaction with Sidewalls

Shock-Wave/Boundary-Layer interaction in case of a compression ramp with sidewalls is investigated in this study. The ramp is inclined at an angle of 24 deg and the interaction is induced by an incoming Mach 2.25 flow. The ratio of boundary layer thickness to domain width is 0.12, which indicates a strong confinement effect of the sidewalls on the centerline flowfield. The instantaneous fields show a complex shock pattern and deviate significantly from the analogous quasi-2D interaction with periodic boundary conditions. Spectra of pressure fluctuations highlighted the low-frequency shock motion at the centerline and sidewalls. Coherence plots indicated an anti-symmetric streamwise movement of the sidewall interactions. Interaction between the corner and centerline separation was investigated by carrying out space-time correlations.