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직교 격자계 기반 유동해석기법을 이용한 파랑 중 해양구조물의 운동 해석Numerical Study on Wave­induced Motion of Offshore Structures Using Cartesian­grid based Flow Simulation Method

Other Titles
Numerical Study on Wave­induced Motion of Offshore Structures Using Cartesian­grid based Flow Simulation Method
Authors
남보우김용환양경규홍사영성홍근
Issue Date
2012
Publisher
한국해양공학회
Keywords
Offshore Structure 해양구조물; Cartesian-grid 직교 격자계; Wave-induced Motion 파랑운동; Flow Simulation Method 유동해석기법; Wave excitation force 파랑 기진력; Added mass 부가질량; Wave damping 파랑 감쇠
Citation
한국해양공학회지, v.26, no.6, pp 7 - 13
Pages
7
Journal Title
한국해양공학회지
Volume
26
Number
6
Start Page
7
End Page
13
URI
https://www.kriso.re.kr/sciwatch/handle/2021.sw.kriso/7892
ISSN
1225-0767
2287-6715
Abstract
This paper presents a numerical study of the wave loads acting on offshore structures using a Cartesian­grid­based flow simulation method. Finite volume discretization with a volume­of­fluid (VOF) method is adopted to solve two­phase Navier­Stokes equations. Among the many variations of the VOF method, the CICSAM scheme is applied. The body boundary conditions are satisfied using a porosity function, and wave generation is carried out by using transient (wave or damping) zone approaches. In order to validate the present numerical method, three different basic offshore structures, including a sphere, Pinkster barge, and Wigley model, are numerically investigated. First, diffraction and radiation problems are solved using the present numerical method. The wave exciting and drift forces from the diffraction problems are compared with potential­based solutions. The added mass and wave damping forces from the radiation problems are also compared with the potential results. Next, the wave­induced motion responses of the structures are calculated and compared with the existing experimental data. The comparison results are fairly good, showing the validity of the present numerical method.
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