The mixing flow characteristics resulted from the interactions between a sonic jet issuing perpendicularly into a supersonic crossflow are studied by using computational fluid dynamics (CFD) approach that applies hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy simulation (LES) on a multi-block structured grid, together with a fully implicit time integration, and a low-dissipation flux evaluation scheme. The adopted approach allows for the simulations to resolve the unsteady large-scale structures that play an important role in the mixing process, for which steady RANS simulations often have the difficulties to accurately capture the details. The purpose of this work is to validate the hybrid RANS-LES simulation results against available experimental measurements and to explore its further capabilities in predicting the mixing flow phenomena. The supersonic boundary layer flow considers conditions of an incoming Mach number 1.6 and a Reynolds number Re6=1.08xl05, based on the free-stream quantities and the boundary layer thickness upstream of the jet exit in absence of the jet flow. Both the geometry configuration and the flow conditions are taken from a previous experimental study. The simulated results are compared to the experiment, including the mean and the standard deviation of the passive scalar and velocity component profiles. It is found that the key flow characteristics observed in the experiment are successfully reproduced by the present numerical study, namely jet induced shocks blockage, boundary layer flow separation ahead of the jet exit and shear layer vortex development along the interface between the jet and the crossflow, the latter is mainly due to the Kelvin-Helmholtz instability.
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