VERTICAL MOTIONS AND WAVE LOADS OF LARGE HIGH-SPEED SHIPS WITH HYDROFOILS

In this paper, the authors present a new method for calculating vertical motions and wave loads of large high-speed ships with hydrofoils. It is very important for this calculation to predict correctly the dynamic lift of the submerged hydrofoils which travel close to the free surface under the waves. The ship motion is predicted by the strip method taking account of the effects of the nonlinear hydrodynamic forces and dynamic lift of the hydrofoils. To verify the present method, the authors compare the computational results with the experimental ones of a new type of hydrofoil catamaran HC2000 having a displacement of 2000 tons and composed of twin V-hulls and four rectangular hydrofoils. The computational results in still water and head seas agree very well with the experimental ones. The method is useful for structural design of large high-speed ships with hydrofoils.