S0510405 Growth of the Vortex Ring Rolled up from Moving Body and Its Dynamic Lift

In nature, flight organisms change flow field around the wing and produce fluid force according to flapping motion of flight organism wing. Therefore, the flow field around the flight organism wing and fluid force are remarked academically. We clarified a vortex ring generated over a butterfly wing in downward and upward flapping motion. We estimated the dynamic lift from the circulation of a vortex ring generated over a butterfly wing and in wake field. The estimation result corresponded to the measurement result of the dynamic lift. Therefore, we clarified that we have to consider the influence of the vortex ring generated in wake field to estimate the accurate dynamic lift. However, we don't clarify the accurate evaluation method of the vortex ring generated in wake filed. So we investigated the evaluation method of the vortex ring generated in wake filed rolled up from Circular plate in heaving motion using computational analysis. We clarified we have to consider the influence of a vortex ring passed through the circular plate until the moving velocity of the vortex ring is constant to estimate the accurate dynamic lift.