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밀도함수법을 이용한 2차원 슬로싱 현상의 수치시뮬레이션
이영길,정광열,이승희,Lee, Young-Gill,Jeong, Kwang-Leol,Lee, Seung-Hee 대한조선학회 2009 大韓造船學會 論文集 Vol.46 No.6
Two dimensional sloshing phenomena in regularly excited liquid cargo tank are numerically simulated with finite difference method. Navier-Stokes equations and continuity equation are computed for this study. The free-surface is determined every time step satisfying kinematic boundary condition using marker-density method. And the exciting force is treated by adding the acceleration of the tank to source term. The results are compared with other existing experiment results. And the comparison results show a good agreement. The sloshing phenomena in the tank of the 138K LNG carrier in sway motion is simulated with present calculation methods in low filling level. To find the relations between impact pressure and excitation condition, the calculations are performed in various amplitudes and periods. The averaged maximum pressures are compared each other.
모형실험 및 수치 시뮬레이션을 이용한 쌍동형 준설선의 선형 설계에 관한 연구
이영길(YOUNG-GILL LEE),손충렬(CHOONG-YUL SON),정우철(UH-CHEUL JEONG),강대선(DAE-SUN KANG),정광열(KWANG-LEOL JEONG),김도정(DO-JUNG KIM) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.2
To develope a hull form of catamaran type dredging vessel, resistance characteristics is investigated to find the interaction effect of waves between the two hulls. The fore body shape is simplified as two dimensional wedge shape for the maintenance and disassembly/assembly. Based on MAC method, numerical simulation is performed in staggered variable mesh system. The conservation form of Euler equations and continuity equation are applied as governing equations. To verify numerical methods, the wave patterns along the hull surface are compared with the results of model tests. This study is performed as varying wedge shape of the bow and the distance between the two hulls. The wave interactions between two hulls are observed to investigate the relation between the resistance performance and the flow characteristics. Suitable hull form and distance between two hulls are discussed.
트랜섬 선미를 가지는 선박의 선미선형 설계에 관한 기초적 연구
이영길(YOUNG-GILL LEE),김규석(KYU-SEOK KIM),강대선(DAE-SUN KANG),정광열(KWANG-LEOL JEONG) 한국해양공학회 2006 韓國海洋工學會誌 Vol.20 No.3
The resistance characteristics of a trimaran are studied, varying the bottom profile and transom stern of the main hull. The bottom profile is varied in three cases (convex, flat, concave). Using the experimental and numerical methods, the resistance performance of each hull form is compared. The experiments are carried out in ship model basin, and the numerical simulations are performed by a finite-difference method, based on the Marker and Cell scheme. Euler and continuity equationsare used for the governing equations of the flow field around a trimaran with transom stern. The agreement of both results is good. The optimal bottom profiles for transom stern are presented for low-speed and high-speed regions, respectively.
A Numerical Simulation of a Viscous Flow behind a Sea-bottom Isolated Ridge in Shallow Water
Young-Gill Lee(이영길),Hideaki Miyata,Guen Moo Lee(이무근) 한국해양공학회 1992 韓國海洋工學會誌 Vol.6 No.1
自由表面下에 잠긴 복잡한 三次元 物體 周圍의 흐름을 解析하기 위한 數値 計算法이 TUMMAC(Tokyo Univ. Modified Marker And Cell)法을 基礎로 하여 開發되었다. 임의 物體의 no-slip 三次元 物體表面條件을 보다 간단히 처리하기 위하여 “porosity”라는 개념이 도입되었으며, 淺水域에 잠겨 있는 海底突出物 周圍의 流動을 計算하여 그 應用性을 검토하였다. 突出物 後方의 복잡한 渦動들의 상호간섭이 잘 시뮬레이션 되었다.