Patent ID: 8876064

Claim:
An element comprising: at least one aerodynamic or hydrodynamic surface; and at least one oscillatory vorticity generator, wherein the at least one vorticity generator comprises: four side walls, having proximal and distal ends; a connector connecting the side walls at their proximal ends; wherein the walls and connector form a cavity within the element, wherein the distal ends of the walls are connected to an opening within the aerodynamic or hydrodynamic surface, and wherein two of the four walls are main walls, positioned opposite to each other; and at least one actuator mounted on at least one of the two main walls, such that when activated, the at least one actuator in conjunction with the at least one main wall produces oscillatory pressures within the cavity; wherein the opening in the aerodynamic or hydrodynamic surface is contiguous with the distal ends of the four walls.