유한요소법을 이용한 초대형 부유식구조물의 시간영역 유탄성응답해석

Abstract

A numerical method is developed for transient hydroelastic response of Very Large Floating Structure(VLFS) in time domain. A finite element method is adopted for both the hydroelastic deformation of a pontoon-type VLFS and fluid motion with fully nonlinear free surface conditions. In the present study, a three-dimensional free surface flow is formulated in the scope of potential flow theory with fully nonlinear free surface conditions. A finite element method based on variational principle is employed as numerical scheme for fluid domain. To describe the motion of VLFS the Mindlin plate modeling is adopted. The equation of plate motion is discretized by finite element method using virtual work principle and solved by Newmark method. To consider the fluid-structure interaction, the nonlinear problem is numerically solved through an iterative method at each time step. The hydroelastic response and surge force of VLFS near shore are investigated in an extreme wave condition.