Abstract: This paper establishes the free surface model using the fractional areas/volume obstacle representation (FAVOUR) method, incompressible Navier Stokes equations, Renormalization Group (RNG) turbulence model and volume of fluid (VOF) function. Then, a set of six degree of freedom equations are proposed to jointly solve the separating movement of submarine launched missile on the water surface. The accuracy and effectiveness of the above models are verified by comparing simulation results with test data. On this basis, the separating kinematic characteristics of submarine launched missile under different sea conditions and water exit angles are investigated. The results show that the mass center position, attitude angle and axial speed of the launch canister and missile are stable and within the safe range in each working condition. However, with the increase of wave height, the range of attitude angles also increases. Under 5 class sea condition, the pitch angle of the launch canister and the missile can reach 22°. Additionally, under the same sea condition, if the launch canister exits from the water with an inclined angle about 10°, the missile will finally obtain a vertical posture. The numerical method in this paper can be effectively applied to the prediction of the separation process of submarine launched missile near the free surface.

Key words: Submarine launched missile, Separating movement characteristics, Free surface, Six degree of freedom motion