Time-Domain Analysis of Nonlinear Wave-Making Problems by a Submerged Sphere Oscillating with Large Amplitude

J. Ocean Eng. Technol. 2006;20(6):67-74.

Kim, Yong-Jig;Ha, Young-Rok;

Dept. of Naval Architecture and Marine Systems Engineering, Pukyong National University;Research Center for Ocean Industrial Development, Pukyong National University;

대진폭 조화 운동을 하는 잠수구에 의한 비선형 조파문제의 시간영역 해석

김용직;하영록;

부경대학교 조선해양시스템공학과;부경대학교 해양산업개발연구소;

Keywords: High-order spectral/boundary-element method, Large amplitude oscillation, Wave-making problems, Nonlinear waves, Hydrodynamic forces, Time-domain

핵심용어: 고차 스펙트럴/경계요소법, 대진폭 조화 운동, 조파문제, 비선형 파, 동유체력, 시간영역

Abstract

A high-order spectral/boundary-element method is newly adapted as an efficient numerical tool. This method is one of the most efficient numerical methods by which the nonlinear gravity waves can be simulated and hydrodynamic forces also can be calculated in time-domain. In this method, the velocity potential is expressed as the sum of surface potential and body potential. Then, surface potential is solved by using the high-order spectral method and body potential is solved by using the high-order boundary element method. By the combination of these two methods, the wave-making problems by a submerged sphere oscillating with large amplitude under the free~surface are solved in time-domain. Through the example calculations, nonlinear effects on free-surface profiles and hydrodynamic forces are shown and discussed.