5. CONCLUDING REMARKS
In this paper, motion equations were derived for 2 ships maneuvering in close proximity within the potential theory under the assumption of rigid wall free-surface. Terms of the added mass and the time derivative, which are zero in case of no presence of other ship, play an important role in the mutual interactions of ships moving in close proximity.
By numerically solving the motion equations, the maneuvering of 2 ferries when one ship overtakes the other and passes away were simulated. Then, the added mass and the interaction forces were calculated by a 3D panel method as a function of the ship position in the time step for solving the motion equations. The collision caused by the hydrodynamic interactions between 2 ferries wa4s realistically demonstrated in case of h/d = 1.2.
It became possible to predict the maneuvering motions of 2 ships when moving in close proximity including the collision behaviors by the method proposed in this paper. As the next step of the study, we will investigate the maneuvering characteristics of ships moving in restricted water in view of the safe navigation.
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The author is currently an Associate Professor in the Department of Social and Environment Engineering, Hiroshima University. Main research area is ship hydrodynamics. He has MSc and PhD in Naval Architecture from Kyushu University. He has also worked as a research manager at Nagasaki R & D Center, Mitsubishi Heavy Industries.