Porous Bleed Boundary Conditions for Shock-Induced Boundary Layer Separation Control

Porous bleed systems are widely used to mitigate the shock-induced boundary layer separation, e.g., in supersonic air intakes. However, the complex geometry makes simulations expensive and motivates the application of suitable models. In this paper, seven porous bleed models are implemented as boundary conditions in the in-house compress-ible RANS solver elsA. The models are compared to a three-dimensional reference simulation, including the porous bleed geometry. Different options are introduced to compare the model outcomes on different levels. None of the models is found to be suitable for the application in the shock-boundary layer interaction control. No model can accurately estimate the mass flow rate for sub-and supersonic conditions. Moreover, the approach based on a uniform suction leads to an overestimation of the porous bleed performance. Thus, the shock-induced boundary layer separation is suppressed.