Numerical Simulation of the Dynamics of a Fishing Vessel Running in Stern Quartering Seas with Trapped Water on Deck

Abstract

The transverse stability of a Japanese purse seiner running in stern quartering waves is investigated using a surge–sway–yaw–roll numerical model. Most Japanese purse seiners have an extended low weather deck surrounded by high bulwarks, which can trap water when the ship runs in high waves. This trapped water on the deck is also taken into account in the numerical study. The results are compared with the results from an existing free-running model experiment executed by two of the authors. As a result, if the water ingress and egress are explicitly modelled, better agreement between the numerical simulation and model experiment are realized. It is also confirmed that raising the aft deck to ensure reserve buoyancy can contribute to a reduction of the roll amplitude in stern quartering waves.