유한요소법을 이용한 비선형자유표면하에서의 초대형 부유구조물의 시간영역 유탄성응답해석

Abstract

A finite element method is developed for the time domain analysis on the hydroelastic deformation of a pontoon-type very large floating structure with fully nonlinear free surface conditions. A three-dimensional free surface flow is formulated in the scope of potential flow theory with the nonlinear free surface conditions. To describe the motion of VLFS the Mindlin plate modeling is adopted. The equation of plate motion is discretized by finite elements using virtual work principle and integrated by Newmark method. To consider the fluid-structure interaction, the nonlinear free surface motion and the plate motion are numerically solved through an iterative method at each time step.