A Study on the Wave Drift Damping of a Moored Ship in Waves

J. Ocean Eng. Technol. 2000;14(4):17-22.

파랑중 계류된 선박의 표류감쇠에 관한 연구

이호영,박홍식,신현경

울산대학교 수송시스템공학부,울산대학교 수송시스템공학부,울산대학교 수송시스템공학부

Keywords: Wave drift damping, Translating and pulsating green function, 3-Dimensional panel method, Drift force and moment

핵심용어: 파랑표류감쇠, 전진하면서 동요하는 그린함수, 3차원 패널법, 표류력과 모우멘트

Abstract

As the offshore oil fields are moved to the deep ocean, the oil production system of FPSO(Floating Production Storage and Offloading System) Type are constructed frequently these days. So, it is very important to estimate the drift motion and damping effects due to the drift motion simultaneously. The components of slow drift motion damping consist of viscous, wave radiation effect and wave drift damping. It is needed to estimate the wave drift damping more accurately than others. The wave drift damping signifies the time-rate of mean wave drift force on oscillating ship or ocean structure which constant speed. In order to calculate this, the 3-Dimensional panel method is employed with the translating and pulsating Green function in the frequency domain. The calculation is carried out for a Series 60 ($C_B$/=0.7) and the results are compared with other numerical ones.