Abstract

A numerical study of the three-dimensional interaction between crossing shocks generated by symmetric sharp fins and a flat-plate turbulent boundary layer is presented. The full mean compressible Navier-Stokes equations, incorporating a turbulent eddy-viscosity model, are solved. Computed results for the flow past (11 deg, 11 deg) symmetric fins at a freestream Mach number Mw = 2.95 and Reynolds number Re^ = 2.5 X 10s (based on the undisturbed boundary-layer thickness 600) show general agreement with experimental measurements for flatplate surface pressure and surface flow visualization. Analysis of the computed flowfield reveals a complex interaction involving the collision of two slowly counter-rotating vortical structures generated by the initial shock/boundary-layer interaction due to each fin. Associated with the streamline structure of the interaction is the formation and growth of a region of low energy near the centerline, downstream of the crossed shocks. A first look at the shock structure of the interaction is provided.

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