Wall-Modeled Large-Eddy Simulation of Transonic Airfoil Buffet at High Reynolds Number

In this study, wall-modeled large-eddy simulation of transonic buffet phenomena over the OAT15A supercritical airfoil at two different Mach number conditions (nonbuffet M∞=0.715 and buffet M∞=0.73 conditions) at high Reynolds number Rec=3.0×106 is conducted to investigate the prediction accuracy of the wall-modeled large-eddy simulation for the buffet phenomena. Thanks to the wall model, at the present Reynolds number, the grid spacing and the time-step size are increased by one order of magnitude compared with the traditional wall-resolved large-eddy simulation, and the high-fidelity large-eddy simulation can be applied to the buffet phenomena, which include the very low-frequency shock-wave oscillation. The results demonstrate the capability of the present wall-modeled large-eddy simulation for predicting the buffet phenomena. The present wall-modeled large-eddy simulation successfully predicts the buffet onset in the Mach number sweep, the buffet frequency, and turbulence statistics without the use of ...