Correlation-based Transition Transport Modeling for Three-dimensional Aerodynamic Configurations

Kurzfassung

The correlation-based gamma-Rethetat transition transport model was implemented into a hybrid Reynolds-Averaged Navier-Stokes solver and validated on various test cases. The gamma-Rethetat model predicts two-dimensional transition phenomena such as transition due to Tollmien-Schlichting instabilities and separation-induced transition. The present work includes results for the application of the gamma-Rethetat model to two three-dimensional test cases, which are the 6:1 inclined prolate spheroid and the ONERA M6 wing. Depending on the flow conditions, the computational results are in good agreement with the experimental data. Once, the given flow conditions lead to three-dimensional transition phenomena, the transition prediction with the gamma-Rethetat model is not reliable, because the model is based on the characteristics of two-dimensional boundary layers and three-dimensional transition mechanisms are not taken into account. In order to close this gap, the gamma-Rethetat model was extended by an approach which accounts for transition due to crossflow-instabilities in three-dimensional boundary layers. This approach and its implementation into the original model are introduced in this paper. First results for the flow over two different infinite swept wing configurations which are the ONERA D wing and the NLF(2)-0415 wing are presented.