Experimental investigation into the roll damping characteristics of the intact and damaged ship in still water and ice floes

Ships face potential risks of damage from navigation environments and human factors. The multiphase flow of ship-water-ice particularly increases the difficulty of evaluating the roll damping characteristics of a damaged ship in ice floes. To better analyze effects brought by different factors, five test scenarios with initial heeling angle of 6.0, 13.0 and 21.0 deg are performed in this paper, including the intact ship and damaged ship in the still water and ice floes. Experimental results indicate that regardless of the intact ship or the damaged ship, effects of ice floes on the roll damping of the ship can be ignored. However, effects of flooding water and the ventilation level of the flooded compartments must be considered. Especially for the flooding water, the nonlinear damping coefficients of the damaged ship are increased by approximately one order of magnitude compared to the intact ship. In general, the test results can not only be used for the current qualitative analysis of roll damping but also serve as benchmarking data for future verification of numerical reliability.