In fluid mechanics , a flow condition (see
Common examples are wind and water swirling around obstructions, or fast flow ( Reynolds number greater than 2,100) of any sort. Eddies, vortices, and a reduction in drag are characteristics of turbulence. Lowered drag enables golf balls to travel farther than they would do otherwise, and the dimpled surface of golf balls is meant to encourage turbulence in the {{link=boundary layer">boundary layer. If swimsuits with rough surfaces help swimmers to move faster, as has been claimed, the same explanation may apply.