Adjoint-based optimization of flapping plates hinged with a trailing-edge flap

It is important to understand the impact of wing-morphing on aerodynamic performance in the study of flapping-wing flight of birds and insects.We use a flapping plate hinged with a trailing-edge flap as a simplified model for flexible/morphing wings in hovering.The trailing-edge flapping motion is optimized by an adjoint-based approach.The optimized configuration suggests that the trailing-edge flap can substantially enhance the overall lift.Further analysis indicates that the lift enhancement by the trailingedge flapping is from the change of circulation in two ways:the local circulation change by the rotational motion of the flap,and the modification of vortex shedding process by the relative location between the trailing-edge flap and leading-edge main plate.