Abstract
Recently, Many researchers are interested in the flight mechanism of insects. In all the insects, especially butterfly has a larger wing area and less frequency of flapping motion than the other insects. Therefore, the butterfly is able to fly efficiently. If the flying mechanism of butterfly is revealed, it would be believed to apply the flying mechanism to engineering field. The purpose of this study is to clarify vortex structure and its dynamic behavior in the wake of the butterfly in free flight. Specifically, the authors was visualized the flow after the flight to butterfly by a stereo particle image velocimetry (stereo-PIV). As a result, we were able to visualize the end of the vortex ring. In addition, it was also found out that there is the presence of induced flow with three-dimensional expanse in the vortex ring.
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