Abstract
The present study has conducted large-eddy simulation (LES) of smooth and golf ball around the critical Reynolds number. Drag coefficients and the flow field around the sphere and the golf ball have been analyzed. The result shows that the surface roughness on the golf ball surface doesn't strongly affect the flow behavior in the subcritical regime. However, the surface roughness could result in the drag crisis of golf ball occurring at a lower Reynolds number in the supercritical regime compared with the smooth sphere. This is because the flow becomes instable when it passes the dimples at the supercritical Reynolds number and could consequently travel further downstream.
