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슬로싱 충격현상 해석을 위한 모형실험과 수치해석 적용에 관한 비교 연구
양경규(Kyung-Kyu Yang),김지응(Jieung Kim),김상엽(Sang-Yeob Kim),김용환(Yonghwan Kim) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.2
In this study, experimental and numerical methods were applied to observe sloshing impact phenomena. A two-dimensional rectangular tank filled with water and air was considered with a specific excitation condition that induced a hydrodynamic impact without an air pocket at the top corner of the tank. High-speed cameras and a pressure measurement system were synchronized, and a particle image velocimetry(PIV) technique was applied to measure the velocity field and corresponding pressure. The experimental condition was implemented in a numerical computation to solve incompressible two-phase flows using a Cartesian-grid method. The discretized solution was obtained using the finite difference and constraint-interpolation-profile (CIP) methods, which adopt a fractional step scheme for coupling the pressure and velocity. The tangent of the hyperbola for interface capturing (THINC) scheme was used with the weighed line interface calculation (WLIC) method to capture the interface between the air and water. The calculated impact pressures and velocity fields were compared with experimental data, and the relationship between the local velocity and pressure was investigated based on the computational results.
직교 격자계 기반 유동해석기법을 이용한 해양구조물에 작용하는 파랑하중 해석
남보우(Bo Woo Nam),양경규(Kyung Kyu Yang),김용환(Yonghwan Kim),성홍근(Hong Gun Sung),홍사영(Sa Young Hong) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
This paper presents a numerical study of wave loads acting on offshore structures using a Cartesian-grid based flow simulation method. Finite volume discretization with volume-of-fluid(VOF) method is adopted to solve two-phase Namer-Stokes equations. Among many variations of VOF method, CICSAM scheme is applied. Body boundary conditions are satisfied using porosity function and wave generation is carried out by using transient(wave or damping) Tone approaches. In order to validate the present numerical method, three different basic offshore structures including sphere, Pinkster"s barge, WigleyIII models are numerically investigated. Diffraction and Radiation problems are solved by the present numerical method. Wave exciting and drift forces from diffraction problems are compared with potential-based solutions. Added mass and wave damping forces from radiation problems are also compared with potential results. Comparison results are jenny good to show the validity cf the present numerical method.
직교 격자계 기반 유동해석기법을 이용한 해양구조물에 작용하는 파랑하중 해석
남보우(Bo Woo Nam),양경규(Kyung Kyu Yang),김용환(Yonghwan Kim),성홍근(Hong Gun Sung),홍사영(Sa Young Hong) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
This paper presents a numerical study of wave loads acting on offshore structures using a Cartesian-grid based flow simulation method. Finite volume discretization with volume-of-fluid(VOF) method is adopted to solve two-phase Navier-Stokes equations. Among many variations of VOF method, CICSAM scheme is applied. Body boundary conditions are satisfied using 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 sphere, Pinkster's barge, wigleyIII models are numerically investigated. Diffraction and Radiation problems are solved by the present numerical method. Wave exciting and drift forces from diffraction problems are compared with potential-based solutions. Added mass and wave damping forces from radiation problems are also compared with potential results. Comparison results are fairly good to show the validity of the present numerical method.
직교 격자계 기반 유동해석기법을 이용한 파랑 중 해양구조물의 운동 해석
남보우(Bo Woo Nam),김용환(Yonghwan Kim),양경규(Kyung Kyu Yang),홍사영(Sa Young Hong),성홍근(Hong Gun Sung) 한국해양공학회 2012 韓國海洋工學會誌 Vol.26 No.6
This paper presents a numerical study of the wave loads acting on offshore structures using a Cartesian-grid-based flow simulation method. Finite volume discretization with a volume ?of fluid(VOF) method is adopted to solve two phase Navier-Stokes 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 potential-based solutions. The added mass and wave damping forces from the radiation problems are also compared with the potential results. Next, the wave-induced 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.