비특이화 간접경계적분방정식 방법을 이용한 부유식 구조물의 유체동역학적 거동에 대한 주파수영역 해석

• Published in: 大韓造船學會 論文集 Vol. 56; no. 1; pp. 11 - 22
• Main Authors: 오승훈(Seunghoon Oh), 정동호(Dongho Jung), 조석규(Seok-kyu Cho), 남보우(Bo-woo Nam), 성홍근(Hong Gun Sung)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2019
• Subjects: 조선공학; Rankine source method(랜킨 소오스 방법); Mean wave drift load (시간 평균 파랑 표류 하중); Floating structure(부유식 구조물); 비특이화 간접 경계적분방정식 방법; Desingularized indirect boundary integral equation method (DIBIEM; Hydrodynamic response(유체동역학적 응답)
• ISSN: 1225-1143; 2287-7355
• DOI: 10.3744/SNAK.2019.56.1.011

In this paper, a Rankine source method is applied and validated to analyze the hydrodynamic response of a three-dimensional floating structure in the frequency domain. The boundary value problems for radiation and diffraction problem are solved by using a desingularized indirect boundary integral equation method (DIBIEM). The DIBIEM is simpler and faster than conventional methods based on the numerical surface integration of Green's function because the singularities of Green's function are located outside of fluid regions. In case of floating structure with complex geometry, it is difficult to desingularize the singularities of Green's function consistently. Therefore a mixed approach is carried out in this study. The mixed approach is partially desingularized except singularities of the body. Wave drift loads are calculated by the middle-field formulation method that is mathematically simple and has fast convergence. In order to validate the accuracy of the developed program, various numerical simulations are carried out and these results are analyzed and compared with previously published calculations and experiments.