Abstract:Studying the influence mechanism of floating ice on the cavity flow and hydrodynamic characteristics during the water-exit process of a submarine is of great significance for expanding the application of submarine-launched vehicle in low-temperature environments. Based on Computational Fluid Dynamics-Finite Element Method (CFD-FEM), a bi-directional fluid-structure coupling has been established to calculate the water exit of a blunt-headed vented vehicle in a floating ice environment. A comparative study was conducted on the differences in cavity evolution and hydrodynamic characteristics between ice-free and ice-water mixture. The results indicate that floating ice causes bending and wrinkling of the shoulder cavity, promoting a mixing of cavity with surrounding liquid, and increasing the area of high velocity and vortex presence in the flow field. The impact of ice leads to the formation of high-stress regions at the head of the vehicle, resulting in a reduction in its kinetic energy during the cross-water stage and decreasing its motion stability. Novel vehicles suitable for ice-covered environments must possess greater impact resistance. The findings can provide some reference for the design of new vehicles intended for operation in icy regions.
