Evaluation of turbulence models in the PARC code for transonic diffuser flows

摘要: Flows through a transonic diffuser were investigated with the PARC code using five turbulence models to determine effects of model selection on flow prediction. Three algebraic models: Thomas (the standard in PARC), Baldwin-Lomax, and Modified Mixing Length-Thomas (MMLT). The other two low Reynolds number k-epsilon Chien Speziale. flows, referred as no-shock, weak-shock, strong-shock cases, calculated each conduct evaluation. Pressure distributions, velocity profiles, locations shocks, maximum Mach numbers duct quantities compared. Overall, was most accurate when considering results obtained for all three cases. However, MMLT provided solutions no-shock weak-shock at substantially lower computational cost (measured CPU time required obtain converged solutions). strong shock flow, which included region shock-induced separation, only predicted well by models.