Near Stall Unsteady Flow Responses to Morphing Flap Deflections

The unsteady flow characteristics and responses of an NACA 0012 airfoil fitted with a bio-inspired morphing trailing edge flap (TEF) at near-stall angles attack (AoA) undergoing downward deflections are investigated Reynolds number 0.62 × 106 near stall. An geometric parametrization dynamic meshing scheme used to drive the motion. objective is determine susceptibility actuation viability rapid deflection as control mechanism, including its effect on transient forces field unsteadiness. studied for range frequencies (at fixed large amplitude), using high-fidelity, hybrid RANS-LES model. time histories lift drag coefficient exhibit proportional relationship between frequency slope response which these quantities evolve. Interestingly, overshoot in captured, even quasi-static conditions, however this not seen coefficient. Qualitative analysis confirms that stall conditions receptive TEF deflections, some similarities triggering exist TEFs ramp-up type pitching motions.