Hybrid RANS-LES and URANS Simulations of a Laminar Transonic Airfoil
Laminar flow is a potential way of minimizing drag and reducing aircraft emissions. However, the interaction of laminar boundary layers with shock waves at transonic speeds can cause severe detrimental aerodynamic effects and remains an opened question. In this way, in the framework of the TFAST European project, a laminar transonic airfoil has been developed for both numerical and experimental studies on such laminar interactions. The so-called V2C profile has been studied to provide natural laminar flow from the leading edge to the shock wave for a wide range of freestream Mach numbers and angles of attack. In the present paper, a numerical investigation of the transonic flow around the V2C airfoil is conducted by means of URANS and hybrid RANS-LES computations. At sufficiently-high angles of attack and moderate freestream Mach number (0.70), the transonic interaction develops buffet. In the paper, special attention is paid to the differences between the URANS and hybrid RANS-LES predictions of the shock-induced separation.
KeywordsCritical Angle Freestream Mach Number Shock Wave Boundary Layer Interaction Natural Laminar Flow Alternate Vortex
As mentionned several times in this paper, this work was supported by the TFAST European project—Transition Location Effect on Shock Wave Boundary Layer Interaction. The research team thankfully acknowledges the French computing centers CINES and CALMIP for the HPC resources allocated as well as for their availability.
- 1.Barbut, G., Braza, M., Hoarau, Y., Barakos, G., Sévrain, A., Vos, J.B.: Prediction of transonic buffet around a wing with flap. In: Progress in Hybrid RANS-LES Modelling, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 111, pp. 191–204. Springer (2010)Google Scholar
- 12.Shur, M., Strelets, M., Zaikov, L., Gulyaev, A., Kozlovand, V., Secundov, A.: Comparative numerical testing of one- and two-equation turbulence models for flows with separation and reattachment. In: AIAA Paper (95–0863) (1995)Google Scholar
- 13.Spalart, P.R., Allmaras, S.R.: A one-equation turbulence model for aerodynamic flows. La Recherche Aérospatiale 1, 5–21 (1994)Google Scholar