Three dimensional steady flowfield generated by transverse sonic injection into a supersonic flow was simulated by solving the Favre_averaged Navier_Stokes equations using the weighted essentially nonoscillatory (WENO) schemes and Jones_Launder k_ε model. Results indicate that in the upstream of the square injection there exist two main recirculation regions and the primary vortex induces the horseshoe vortex region. In the downstream there is a low pressure region which conduces a pair of helical vortex.
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