Cavitating flows can occur in a variety of practical applications.This paper focuses on the tip vortex cavitation of a marine propeller.Cavitating flows can be predicted using a wide range of methods.One strategy consists of using the RANS(Reynolds Averaged Navier Stokes) approach along with an additional transport equation for liquid volume fraction is adopted in the numerical simulation.Numerical results with structure mesh are presented to predict the open water performance and the cavitation types in a uniform inflow.In the present study,a high speed camera Photron camera is used to investigate the characteristics of the tip vortex cavitation behind a marine propeller with 5 blades at high Reynolds number.It concluded that the numerical results are in agreement with the experimental data.The overall results indicate that the present approach is reliable for prediction of the inception of tip vortex cavitation in uniform flow.