A study on numerical simulation methods to reproduce long-period ship motions

It is important in berth planning and operation to be accurately familiar with moored ship motions correctly, especially at ports facing the open sea. The phenomenon of moored ship motions has been researched for decades by experiments or numerical simulations, and several numerical simulation methods have been proposed to evaluate ship motions and mooring forces. However, there are few studies that compare these simulation models with respect to time domain analysis, especially in long-period motions. In this study, moored ship motions are analyzed with the use of several examples corresponding to several simulation methods, and the simulation results are compared with each other. Firstly, hydrodynamic forces are calculated and compared among numerical simulation methods such as three- and two-dimensional ones. Finally, moored ship motions in the time domain are solved by two kinds of models.