A numerical unsteady approach is fallowed to simulate ventilated cavitation behind an axisymmtric body. In this study liquid-gas interface is modeled, using the volume of fluid (VOF) method based on young’s algorithm. Transient Navier-Stokes equations are solved along with an equation to track the cavity interface. Turbulent fluctuations in the velocity field are modeled using the Reynolds Averaged Navier-Stokes (RANS) methodology. Turbulence is assumed to be isotropic and RNGk  turbulence model is used in this investigation. Different free stream velocities are considered. First, the results for variation of cavity length with cavitation number have been compared to the available experimental data for a two-dimensional wedge. The good agreement between the computational and experimental results validates the present numerical method. Then this method has been used to simulate the ventilated cavitation behind a cone with the same chord and angle as the wedge. Simulation shows that, the cavity length will increase by decreasing the cavitation number. The results show that at the same cavitation numbers, the cavity lengths of the wedge are longer than those of the cone.

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