RANS Simulation of Laminar-Turbulent Transition in Separation Bubbles on Airfoils

Jean Perraud (1) , Luis Bernardos (2) , Julien Marty (2) , Gregory Delattre (1)

1 DMPE, ONERA, Université de Toulouse [Toulouse]
2 DAAA, ONERA, Université Paris Saclay (COmUE) [Meudon]

Predicting the location of laminar-turbulent transition, and modelling the transition region inside a separation bubble are two related questions presently limiting the performance of flow simulations. Considering these questions requires both an understanding of the underlying physics and a number of improvements of the available numerical tools. Several airfoils presenting short and long laminar bubbles are considered, trying to define a common approach with an internal prediction of laminar-turbulent transition. Comparisons to existing measurements and current predictions will be presented. Two methods for transition prediction are used with the same elsA numerical platform, transition criteria and the Menter-Langtry approach.

Mots clés: LAMINAR-TURBULENT TRANSITION; SEPARATION BUBBLE; RANS TRANSITION PREDICTION

Mots clés: TRANSITION LAMINAIRE-TURBULENT; BULBE DE DECOLLEMENT LAMINAIRE; PREVISION DE TRANSITION EN MODE RANS

Domaines: Sciences de l'ingénieur [physics]; Physique [physics]

Jean Perraud, Luis Bernardos, Julien Marty, Gregory Delattre. RANS Simulation of Laminar-Turbulent Transition in Separation Bubbles on Airfoils. NATO/STO AVT 307 – Separated Flows, Oct 2019, TRONDHEIM, Norway. ⟨hal-02422738⟩