Unsteady Simulation of Transonic Buffet of a Supercritical Airfoil with Shock Control Bump

The unsteady flow characteristics of a supercritical OAT15A airfoil with shock control bump were numerically studied by wall-modeled large eddy simulation. numerical method was first validated the buffet and nonbuffet cases baseline airfoil. Both pressure coefficient velocity fluctuation coincided well experimental data. Then, four different bumps tested. A height h/c = 0.008 location xB/c 0.55 demonstrated good effect. lift-to-drag ratio case increased 5.9%, root mean square lift decreased 67.6%. Detailed time-averaged quantities instantaneous fields analyzed to demonstrate phenomenon bumps. results that an appropriate “?” shockwave pattern caused is important for