Turbulence Model Extension for Low Speed Thermal Shear Layers
2014
CFD predictions using Reynolds averaged Navier Stokes turbulence models have been unreliable for providing quantitative prediction of film cooling effectiveness and thermal shear layers often found in jet engine exhaust systems. We propose an extension of Menter’s Shear Stress Transport model that adds a density gradient driven term to the outer layer to account for turbulent energy transport mechanisms which are small in boundary layers but often significant for relatively low speed thermal mixing. This locally applied term significantly improves the prediction of the global shear layer mixing rate, collapsing the data to velocity difference variations seen experimentally. Using a turbulent Prandtl number appropriate for shear layers further improves the predicted mixing rate of constant pressure cooling slot films.
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