When the body is running at fully immersed condition in viscous fluid, there are two components of resistance, i.e. frictional resistance and form drag. When it is near the free surface, the additional drag encountered to the body which is wave-making drag. This paper is presents the hydrodynamic performance of high-speed Unmanned Underwater Vehicle (UUV) in fully immersed condition. We did 1000000 (cells) fluid mesh around the body using Navier Stokes (N-S) equations and appropriate boundary conditions. The calculations of drag and lift have been obtained at various speeds and attack angle. The model is used to solve the N-S equations. We firstly calculated for the sphere and the results of pressure distributions and drag are very good and satisfactory with the experimental data. The calculations are extended to the UUV and the pressure distributions and drag are shown in good agreement with data.