Abstract
Turbulent shear flow in a corner formed by a solid wall and a free surface is investigated using many flow visualization techniques and DPTV which combines Dye steak injection with Particle Tracking Velocimetry. The “wall streamwise vortices” are formed on the side wall and then developed to a free surface. And the vortices are moving away from the wall at the free surface. The vortices induce the secondary flow to the side wall and to the fine surface. Parts of the vortices tube agree with streaks on a free surface. The vortices form the boils on the fee surface.
