Numerical investigation into motion responses of the intact and damaged DTMB 5415 based on the AMR method in regular waves

This paper proposes a feasible numerical approach to investigate motion responses of the intact and damaged DTMB 5415 model in still water and regular waves at zero speed. Overset mesh with Adaptive Mesh Refinement (AMR) technique is applied to deal with the ship's motions. Theoretical wave analysis and one benchmarking study are performed to verify the reliability of the applied numerical method. The results show that no matter whether the damaged ship is in still water or waves, asymmetric flooding always makes the ship maintain a larger heel angle. If the damaged ship further encounters beam waves towards the intact side, the possibility of capsizing will be greatly increased. Moreover, due to the wave excitation, the pitch and heave motions are more intense than motions in still water. However, the intense motions will not threaten the ship's safety. Finally, by comparing with motions of the intact ship in waves, influences of asymmetric flooding and beam waves are quantified. It is concluded that the rolling effect caused by asymmetric flooding should be firstly reduced. Generally, to facilitate the safe return of the damaged ship to port, it is necessary to reduce the asymmetric effect and set the appropriate course.