Influence of the Hull Shape of a Submerged Body on its Movements in a Near-Surface Water Environment

Forces and moments affecting a submerged body by liquid can have a significant effect on the nature of its movement when thesubmergenceis little. The study considers the movement of submerged bodies with various cross-sectional shapes near the free surface of water, using the methods of experimental and numerical simulation. We numerically analysed the influence of the hydrodynamic pressure field formed around the body on the wave pattern when moving at different speeds, and determined the dependence of the wave resistance coefficient for models with given parameters. The nature of the change in the dependences of the lift force and trimming moment on the Froude number was determined. On the basis of the experimental tank for the first time we obtained the experimental dependences of relative vertical displacement of submerged bodies of various shapes under the influence of the lift force and trim angles during their movement.