Three-dimensional numerical study on the evolution process of tail bubble of underwater vehicle vertical launching

To study the evolution process of tail bubble of underwater vehicle vertical launching, Mixture model, standard k-Ε turbulence model and dynamic mesh method were adopted to establish 3DOF model to carry out numerical simulation of the vertical launching process, the calculation results agreed well with experimental results, the cyclical characteristics of the evolution process of tail bubble was acquired. The influences of transport velocity and launch water depth on the tail bubble evolution process were researched, the results show that the bigger transport velocity, the bigger re-entrant jet flow angle after tail bubble fractures; the bigger launch water depth, the bigger pressure magnitude of tail bubble and the shorter pressure oscillation period.