Study of the Drag Reduction Characteristics of Circular Cylinder with Dimpled Surface

To reduce the drag of a cylinder, numerical simulations and experiments for both smooth cylinder circular with dimpled surface are carried out in this paper. The simulation focuses on variation pressure coefficient, skin friction vortex shedding strength surface. It is found that structure can effectively within specific range Reynolds number, maximum reduction rate reaches up to 19%. Another conclusion have an essential influence total On other hand, also decreases decrease drag. Then, flow field cylinders measured using particle image velocimetry (PIV) technique, confirming affect velocity field, release vortices scale vortex. More specifically, recovery faster than delays at number.