Modelling of the water on deck problem for an offshore supply vessel running in regular astern waves

Abstract

The motion of trapped water on the weather deck of an offshore supply vessel running in regular astern seas is modelled using shallow water equations. The inflow and outflow through the weather deck openings and over the bulwarks are modelled using boundary conditions in the flow domain. The hyperbolic flow equations are numerically solved using a higher-order finite volume method. The prescribed motion data for the weather deck is obtained directly from systematic model experiments. Simulated results of the deck water motion are compared against monitored data from the experiments, recorded using a system of pressure sensors and cameras placed on the weather deck. Additionally, the moment caused by the motion of the trapped water and its variation with the ship speed are investigated.