Numerical simulations are presented to investigate the effects of employing synthetic-jet actuators (SJAs) as active noise control devices for reduction of airfoil acoustic radiation. High-accuracy numerical efforts employ a 6th-order Navier-Stokes solver implementing low-pass filtering of poorly resolved high-frequency solution content to retain numerical accuracy and stability over the range of transitional flow regimes. In the adopted numerical procedure, the actuator is modeled without its resonator cavity through imposing a simple fluctuating-velocity boundary condition at the bottom of the actuator's orifice. The orifice cavity with the properly defined boundary condition is then embedded into the airfoil surface for conducting high-accuracy viscous analysis of SJA-based active noise control. The results confirm the previous findings in our earlier work (Mankbadi et al., [1]) that the SJA actuators can reduce the radiated sound. The present work perform a more rigorous study to point out the scope of validity of this result both for a Joukowski airfoil as well as a NACA-0012 airfoil.
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