Free Surface Potential Flow around Multi-Hulls in Shallow Water Using a Potential Based Panel Method

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The present paper investigates the shallow water effect on the hydrodynamic characteristics of lifting body such as wave resistance, sinkage and trim using a potential based boundary element method. The surfaces are discretized into flat quadrilateral elements and the influence coefficients are calculated by Morino's analytical formula. The body boundary condition is linearized about the undisturbed position of the body and the free surface condition is linearized about the mean water surface by the systematic method of perturbation. The results of investigation provide a better understanding the effect of hull separation on the wave resistance of catamaran hull. The influence of water depth on trimaran is, in principle, the same as the influence of water depth on mono hull in the sense that the same type of subcritical, critical and supercritical region is recognized. The peak of wave resistance curve and wave pattern at the critical speed check the validity of the computer scheme.
社団法人日本船舶海洋工学会の論文
2002-09-25