The wake structures caused by the swimming motions of the Atlantic stingray (Dasyatis sabina) is investigated using TR-PIV. The very nature of collecting data on live animals creates a situation where no two experimental runs are identical, eliminating the possibility for phase-averaging. Each run shows the stingray passing through the light sheet at a different horizontal position and a different distance from the bottom of the tank. These data show that the various swimming modes are related to distinct flow patterns that are linked to the propulsive efficiency of the fin motion. The fluid motions and vorticity in the wake of the Atlantic stingray show distinct differences in pattern that are associated with the thrust production based on each swimming mode, buoyancy control and proximity to the bottom.
实验装置
Experimental setup
测试结果
Time-resolved data on a stingray showing shed pairs of vorticity
Courtesy of Frank Fish, West Chester University, USA
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