Unsteady forces on the wing subjected to spanwise twisting

Force analysis and flow visualization on the wing subjected to spanwise twisting are studied at constant Reyolds number 18000. The wing is designed to change the shape in a spanwise direction with a flexion ratio of 0.6. The wing morphing time is kept at 1 second. The spanwise twisting causes the spanwise variation in the angle of attack. Due to the spanwise variation of the angle of attack, there will be a vorticity gradient along the span of the wing. This type of wing morphing can be used to achieve higher stability during unsteady maneuvers. The maneuvers are inspired by animal locomotions. Most of the natural flyers and swimmers change the shape of the wing to get extra stability and higher maneuverability during their attack and escape maneuvers. Wing morphing not only controls the inertial forces but can be used to control circulatory forces by controlling the formation of edge vortices. In this work, we have demonstrated how we can quantitatively and qualitatively change both inertial and circulatory forces for the wing which can perform controoled spanwise angle of attack of variation.