An explicit cell-centered finite volume solver coupled to a turbulence model corrected for structural compressibility fails to satisfactorily predict the behavior of under-expanded supersonic jets exhausting into still air, because the model does not properly account for the turbulence/shock wave interaction. Two approaches are examined: imposing a realizability constraint and taking into account shock unsteadiness effects. Although both corrections yield better agreement with experimental data of under-expanded jets, the realizability constraint yields better results than the shock unsteadiness correction.
Application of Realizability and Shock Unsteadiness to Simulations of Under-Expanded Axisymmetric Supersonic Free Jets
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Emami, B., Bussmann, M., and Tran, H. (April 15, 2010). "Application of Realizability and Shock Unsteadiness to Simulations of Under-Expanded Axisymmetric Supersonic Free Jets." ASME. J. Fluids Eng. April 2010; 132(4): 041104. https://doi.org/10.1115/1.4001341
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