Frequency domain analysis on hydrodynamic characteristics of four vessels located in close proximity

Abstract

The hydrodynamic characteristics of side-by-side moored multiple bodies were studied with the higher order boundary element method(HOBEM). Hydrodynamic coefficients, motion response amplitude operator(RAO) and drift force RAO for multi-bodies were calculated and compared with those of one vessel's cases. Discussion was highlighted on gap flow, shielding and amplifying effects due to existing of multiple vessels. It has been shown that unrealistic peaks were emerged at the vicinity of the gap flow resonance frequency. This exaggerated gap flow was reduced by adopting the artificial body boundary condition. It has been also shown that sheltering and amplifying effects has an insignificant effect on FLBT while other vessels are effected dramatically. Copyright ？ 2017 by the International Society of Offshore and Polar Engineers (ISOPE).