This study investigates the performance of Detached Eddy Simulation (DES) to simulate the flow control by a synthetic jet around an airfoil. The effect of the jet exit angle is focused on. The DES approach is first validated with a non-blowing, high-angle-of-attack case. Flows around NACA0012 airfoil including the synthetic jet cavity and its orifice at 10%-chord location are then simulated at 12-degrees angle of attack and Reynolds number of 10~5. The jet exit angles of 45, 60, 75 and 90 degrees have been studied. Massively separated flows were eliminated in all cases. The angles of 45 and 60 degrees successfully recovered stably attached flow over the airfoil with small amplitude of the aerodynamic forces, while the flow unsteadiness due to remaining separation is observed at higher jet exit angles, resulting in large amplitude of the drag force.
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