Numerical Research on the Water Entry of Structures with Surface Roughness Under Impact Loading

Water entry is of great significance for the design of air-water trans-media vehicles and related weapons. The effect of surface characteristics on the hydrodynamics during water entry is a new research hot spot. However, there are few studies on the effect of surface roughness. Based on the experimental result and force analysis of the contact line model, the friction model is proposed to describe the contact for the rough surface. The simulation results show that the proposed friction model can accurately reflect the separation position with different rough surfaces during water entry. The water entry of a cylindrical structure with asymmetric surface roughness is studied by the established numerical method. The result shows that controlling the water entry trajectory through surface roughness is feasible.