Abstract
The present paper discribes the results of the flow observation around a discus-type navigation buoy which is used in fairly strong tidal currents, The so-called milk-painting method was used for the flow visualization of limiting stream-line and separated vortex flow. Several three-dimensional separations are occured on the bottom and the side wall of the buoy, The starting vortex and wake genarating process in low speed flow are also observed by using the milk-painting method with laser light sheet.
