Numerical Simulation Of Wave Spreading Along Inclined Water Bottom

In modern waterway transportations, larger-scale and speeding-up of vessels have become the trend of development. Higher wake waves become a common problem for high-speed ships recent years. Too higher wake waves could threat people's life on beaches and the safety of other floating bodies near the shoreline. At the same time, they could cause environmental damages, just as bank erosion. How to reduce wave-making and wake-wave caused by high-speed ships has drawn marine engineers'attention. In restricted waters, "lower wake-waves" has been one of the necessary conditions for operation of high speed ships.Characterized by a near/far field combined method, a sketchy calculating frame is built up for ship-wave propagation along a sloping bank.A raised Rankine-source panel method based on NURBS (Non-Uniform Rational B-Splines) for high speed ships is employed in near field calculation. Wigley hull and NPL hull are selected as computational examples. Wake waves of Wigley hull and NPL hull in deep water and shallow water are computed respectively.Using CFD software-FLUENT, the numerical wave-generating was discussed by solving Navier--Stokes equation in VOF discretization. The forward propagating regular wave was simulated in the 2 dimensional tank by adopting the pure numerical wave-generating method which employed the UDF maero to set the boundary condition.Besides, regular wave spreading along inclined water bottom was preliminarily simulated. The calculated results are close to the approximate theory results.The study in this paper present some experience for the researches of the effects of ship-waves on the sloping bank.