抄録
In the present paper a visualization experiment by 'Phenole Phthallein method' is applied for the juncture flows around a cylinder mounted on the bottom of towing tank. One of the important observations is the periodic motions of the locations of foci or the length of twin vortices behind the cylider. The experimental pictures are compared with the solutions for three dimensional full Navier-Stokes equation shown for the internal flows flows such that around the cylinder between two parrael flat plates.
