The aerodynamic performance analyses of windsurfing pumping based on dynamic mesh

Windsurfing pumping can improve the aerodynamic performance of sail and the driving force.The unsteady process was simulated by CFD soft ware FLUENT.Based on the dynamic mesh method,windsurfing pumping simulation was implemented.Using UDF(User Define Function) define the cyclical movement of windsurfing pumping.The performance of sail during windsuring pumping was obtained to compare with steady state,including pressure distributing on sail and the change of lift drag coefficient.It is obvious that the aerodynamic performance of sail is enhanced in windsurfing pumping and gives useful advice to analyze windsurfing pumping.