Numerical Simulation of Sink-Stability for Unmanned Underwater Lurk Vehicle

The sink-stability of unmanned underwater lurk vehicle(UULV) was studied by using the computational fluid dynamics.First,the hexahedral mesh of the UULV in different sinking model was generated by ICEM CFD.Then the variation tendency of lateral force,lift force and rolling moment under different submarine speeds was gotten by using CFX.Based on the force analysis a mathematical model for the analysis of sink-UULV was established.Last,the effect of submarine speed and sinking model on UULV's sink-stability was gotten through combining the numerical simulation's result with that of math model.The result shows that the UULV can remain stable under 0.514 m/s submarine speed,it will be rolling-over when the speed is equal to or greater than 1.028 m/s.