Analysis of Golf And Ping-Pong Balls Aerodynamics

In this study, analysis of the phenomenon of vibration caused by Von Karman vortices and the effect of using surface roughness on creating vortex formation and lifting and drag coefficients at the back of a spherical rigid ridge (similar to ping-pong and golf balls) exposed to fluid flow (air ) Will be dealt with.Vibrations caused by vortices are a phenomenon caused by the vortex resulting from the collision between the fluid flow and the structure of the solid object.When the uniform flow of fluid passes through the constituent, this flow will no longer be uniform and regular; It starts to agitate and creates vortices with a regular arrangement on both sides of the structure (around the structure).These vortices, which are produced by oscillating motions on both sides of the structure, apply an oscillatory force on the structure.For a static structure, such as a cylinder with a circular cross-section, the frequency of production of these vortices is a function of the stroke number, which is the function of the uniform velocity of the fluid and the cylinder diameter.

کلیدواژه ها:

Computational Fluid Dynamics ، Hydrodynamics ، Von Karmen Vortices ، Lift and Drag coefficients