The influence of jet lip geometry on mixing in a supersonic underexpanded jet is investigated numerically. Time accurate numerical simulation of a supersonic underexpanded jet is performed by solving the two dimensional Navier-Stokes equations on nonuniform grids using the second-order explicit MacCormack scheme. Nonreflecting boundary conditions are applied at the outflow and far-field boundaries. Three jet lip shapes are tested. Qualitative and quantitative analysis of the results show a measurable change in mixing among the three cases. The observed difference in the jet pressure radiation indicates that certain modifications in the jet lip could effectively enhance mixing and alter the jet acoustic radiation. The results also show the capacity of the present formulation to resolve the complex features of high Reynolds number supersonic jets.
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