A Comparison of Turbulence Models for a Supersonic Jet in Transonic Crossflow

Numerical simulations of a supersonic jet in a subsonic compressible crossflow are conducted using three turbulence models. The numerical results are compared to existing experimental data. The comparisons with the experiment include separation points, reattachment points, and surface pressures in the near jet region as well as mean total pressure and velocity measurements at 10 and 40 diameters downstream of the jet. The simulations employ a finite volume Navier-Stokes code on structured multi-block grids. The turbulence models considered in this study include the Spalart-Allmaras one-equation model, a low Reynolds number A:-e model and the Wilcox /c-co model. The Spalart-Allmaras model gave poor results in the near-field of the jet, but showed excellent agreement with the downstream total pressure and vorticity data. The two-equations models, while giving good results in the jet near-field, tended to over predict both the strength and the lift-off height of the jetinduced vortex pair.

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