抄録
The aim of this study was to visualize and to analyze the wake of a swimmer's dolphin kick in a horizontal and a vertical (sagittal) plane using two-component PIV (2C-PIV). PIV allows us to visualize the unsteady flow field instantaneously and to estimate the fluid force. One trained male swimmer was instructed to maintain a swimming position with dolphin kicking in a swimming flume at the flume velocity of 1.2m/s. Results of both horizontal and vertical plane showed the pairs of vortices and jet flow between them. The vortices induced by the dolphin kicking motion seemed to be three-dimensional structure. It was plausible that the dolphin kicking motion performed in this study generated a propulsive force by generating the vortex pair and the jet flow as a reaction force.
