Turbulence and Transition Modeling in Transonic Turbine Stages

This paper describes an in-house approach to the transition evaluation which is compared to conventional turbulence closures in test cases where steady and unsteady heat transfer evaluation is considered. The in-house URANS CFD code HybFlow has been used. The standard k-ω model by Wilcox, the SST model by Menter, the ν’2-f model, the k-ε-kl model of Walters and Leylek and the two equations models coupled with the transport of the intermittency function have been tested. The rationale of the work is to verify the accuracy of turbulence and transition models for heat transfer evaluation and by-pass transition when challenging applicative test cases are considered. The present work was carried out in the frame of the EU funded TATEF2 project.