Simulation about 3D flow field of missile underwater motion and water-exit process

To study the trajectory and dynamic property of underwater launching, the underwater vehicle movement and water-exit process were simulated based on the CFD theory and dynamic mesh technology. The VOF model was used to simulate the interface between water and air, and the dynamic mesh technology was adopted to simulate the movement of vehicle and the variation of computational domain. The unsteady simulation coupled with the hydrodynamics and ballistic trajectory based on 3D in 6 degrees of freedom was carried out. The dynamic property of vehicle was obtained by calculation. The study of the spatial flow field structure and dynamic property shows that the submarine speed induces the unsymmetry of vortex around the shoulder of the vehicle and the ballistic deflection, and the effect of fluid moment can enlarge the vehicle deflection during underwater movement and water-exit process.