Abstract
We visualized the flow on the ripple model by the tracer injection method. As the result of it, we obtained statistical regulations for the rength of reattachment point and the scale of eddy on the wake area as for irregular flow of the ripple models.
In this repot, the period of the vortex shedding and the vortex velocity in wake behind a crest of the ripple model were obtained by flow visualization. These results were contrast in a striking way with the Karman vortex street behind a circular cylinder.
