Abstract: The cavitation flow characteristics and hydrodynamic evolution during the rise of submarine launched missile were researched by using a numerical simulation method. The fluid-solid coupling problem of moving boundary of missile body and cavitation flow field was solved by using a continuity equation, transport equations of liquid mass fraction, RANS (Reynolds-Averaged Navier-Stokes) equation in conjunction with a dynamic mesh technique and a standard k-ε turbulence model. Furthermore, the underwater moving process of submarine launched missile was numerically simulated, the effect of warhead lines of submarine launched missile on the partial cavitation and hydrodynamic performance was analyzed in detail, and three groups of underwater trajectory of submarine launched missile in the case of thrust-weight ratio were given . The simulational and analysis results show that the partial cavitating can increase the hydrodynamic performance of missile, and a modest warhead lines of missile can restrain the partial cavitation and improve its hydrodynamic performance.

Key words: fluid mechanics, vertical launch, hydrodynamics, partial cavitatinon, dynamic mesh