COMPRESSIBILITY CORRECTIONS AND 2-LAYER K-EPSILON MODELS FOR HYPERSONIC TURBULENT FLOWS ON UNSTRUCTURED GRID

To compute turbulent hows a two-layer k-epsilon model is used. The com plete model and its shear-based reduction are analysed. Moreover diffe rent compressibility corrections are introduced in the compressible an d in the shear-based versions of the model. Comparisons are made betwe en the results obtained with and without these corrections. We obtain the best results with the shear-based version of the two-layer model w ith the Sarkar correction for the pressure/dilatation term combined wi th the Zeman correction for the dilatational dissipation and using a g radient closure model for the velocity/mean pressure gradient correlat ion. On the other hand, the compressible version overestimates the wal l fluxes, even when using compressibility corrections.