Abstract
The objective of this study is to understand the influence of body impinging to the water surface. Our question is how will the fluid be moved with the body impinging. The spherical body used in the experiment. The flow was visualized with two methods. One is the visualized with digital camera to observe the path line by using long exposure technique. The other is using high speed CMOS camera. The combining of these techniques has two advantages. One is high spatial resolution, and the other is high time resolution. The results show that the path line indicates two phases of flow formed by impingement of body. One, the fluid moved with the body entering the water by a hill's vortex like flow. Two, the fluid moved with deformation of water surface by formation of water splash. The potential like flow formed with the flow impulsively accelerated by the body impingement.
