On the recent developments to the fast modelling of ship flooding for transient and steady-state stages in still water

Fast and reliable tools for simulating ship dynamics enable the prediction of the vessel behaviour, which is of vital importance for damage scenario simulations. This is relevant both at the design stage and for an operating ship in emergencies. This research study concerns numerical simulations of damaged ship dynamics, focusing on steady-state and transient stages of flooding in still water. Experimental data, available for the chosen case studies, enables relevant comparisons with the obtained numerical outcomes. In the first part of the paper, two fast approaches, named apparent gravity and mass exchange, are developed and applied for simulating the roll decay of a hull with a flooded compartment (steady-state stage of flooding). The current paper shows novel insights about the applicability of the apparent gravity method (flat non-horizontal free-surface assumption) and the novel development and implementation of the mass exchange method (flooded compartment virtually subdivided i...