Numerical simulation on hydrodynamic impact effect after submarine launched missile leaves the launcher

The processes of seawater swarming into the tube and its hydrodynamic impact, after the submarine launched missile leaves the launcher, were researched by using the numerical method. Based on the governing equations of two-phase flow, the VOF model and the dynamic mesh technology, the gas-liquid flow during the missile launching was simulated. The hydrodynamic impact of these swarming seawater and the factors which affect the impact pressure were analyzed based on the simulation. The result shows that the seawater bursting into the tube has great effect on the launcher. Furthermore, the peak value of the impact pressure can be decreased significantly by using a damper board near the bottom of the launcher.