A research on the geometrical and hydrodynamic characteristics of the planing hull

The planingstatus on the planing crafts is important regarding to hydrodynamic view point. When the craft is moving from low speed to the high speed, the physical condition of the crafts changes and hydrodynamic forces applied to the hull are different at these two speeds. In the high speed, the craft is planing and rise-up, so the dynamic pressure is much dominant relative to static pressure. Planning crafts are designed at high speed where the flow is very complex around. Spray is produced in the fore part and flow separation created in the aft part (transom). Therefore, free surface is non-linear due to spray and transom flow separation. In this paper, geometrical and hydrodynamical characteristics are studied using potentialbased boundary element method. The method is described and some numerical results of the pressure distribution and hydrodynamics forces are presented.