Wall temperature effects in a turbulent boundary layer subjected to a compression ramp*

The effect of the wall temperature on the shock boundary layer interaction over a 24° ramp at free-stream Mach number of 2.25 was investigated using high-fidelity simulation. Reynolds number of 1800 based on the momentum thickness transitioned to fully developed turbulent flow by employing a counterflow actuator.  Two wall conditions, adiabatic and hot wall thermal conditions were considered. Strong heat transfer through the wall produced a significant dilatation in the interaction region. Both the upstream and downstream turbulent statistics at each wall condition were studied to weigh the contribution to the low-frequency unsteadiness in the interaction region. The resulting Reynolds stress anisotropy tensor exhibited different patterns of turbulence development in the inner layer and outer layer in response to the heating effect. Turbulent statistics revealed that the flow separation frequency scaled with the incoming turbulent structures and heat transfer within the interaction region, which consequently altered the separation length.