High-fidelity simulation and flow control of a plunging airfoil under deep dynamic stall

Abstract

Large eddy simulations are performed to study deep dynamic stall of a SD7003 airfoil in plunging motion. The numerical computations employ a suit of high-order compact schemes for computing derivatives, interpolation and filtering on a staggered grid. The SD7003 profile undergoes a plunge motion at Reynolds number Re = 60,000, Mach number M = 0.1, reduced frequency k = 0.5 and amplitude h0= 0.5. A mesh convergence study is performed and results show good agreement with available data in terms of aerodynamic coefficients. Flow actuation is then applied at the airfoil leading edge and we observe that, for a specific frequency range of actuation, the airfoil drag is substantially reduced while the lift is maintained almost unaffected. The physical mechanisms responsible for the flow changes in the controlled case are then discussed