It is well-known the dimples on the surface of golf ball increase its flying distance. But the detailed mechanism of flow by dimples has not been made clear. This paper deals with the effect of the grooves as modeled dimples that were put on the surface of a circular cylinder. The computation was performed by solving the Navier-Stokes equation using the QUICK method. The grooves were formed in the same shape as a golf ball and the number of dimples is 32. The experiment was performed flow visualization using spark tracing method. These results of the flow pattern around the circular cylinder showed good agreement.
