수평 운동을 고려한 초대형 부유식 해상구조물의 극한 파랑 중 유탄성 거동해석

Abstract

A numerical analysis on hydroelastic response of VLFS(Very Large Floating Structure) considering horizontal motion is made in time domain with extreme wave condition. In the most of previous studies, the only vertical motion of VLFS has been investigated in time domain analysis, which is appropriate for operational condition. But in the state of survival condition, the horizontal motion coupled with the hydroelastic response would be very important to design the mooring system of VLFS. In the present paper, a three-dimensional free surface problem coupled with hydroelastic response of VLFS is formulated by the classical potential flow theory. A finite element method based on the variational principle is employed both for fluid motion and structural response. Elastic response of VLFS is analyzed by Mindlin plate formulation. For a numerical simplicity, only surge motion is considered.