Use SST k-w model. If the mesh is not so good, use Warped-Face Gradient correction, Use 10-50 Courant number until the solution gets stable and converges. Then gradually increase it till 100-150. Use First Order for the spatial discretization and once the solution gets converged, move on to second order. Reduce the URFs to 0.25 until the solution gets stable and converges. Then gradually increase to default.
Try using temperature dependent properties for air instead of constant values.
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