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파랑중 KCS 선형의 2자유도 운동에 관한 CFD 시뮬레이션
Hiromichi Akimoto,박종천(Jong-Chim Park),옥유빈(Yu-Bin Ock),허재경(Jae-Kyung Heo),정세민(Se-Min Jeong),Rahaman Md. Mashiur,김현철(Hyun-Chul Kim) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
A unsteady RaNS code is applied to simulate MOERI container snip model, KCS, in regular head sea conditions. Various combinations of Froude"s number, wave length and wave height are simulated. With respect to the integral quantities, a comparison between simulation and experimental results shows that the computed amplitude or heave md pitch motions are in well agreement each other. However, the first-order harmonic amplitudes of heave are significantly under predicted by the present simulations.
파랑중 KCS 선형의 2자유도 운동에 관한 CFD 시뮬레이션
Hiromichi Akimoto,박종천(Jong-Chun Park),옥유빈(Yu-Bin Ock),허재경(Jae-Kyung Heo),정세민(Se-Min Jeong),Rahaman Md. Mashiur,김현철(Hyun-Chul Kim) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
A unsteady RaNS code is applied to simulate MOERI container ship model, KCS, in regular head sea conditions. Various combinations of Froude's number, wave length and wave height are simulated. With respect to the integral quantities, a comparison between simulation and experimental results shows that the computed amplitude of heave and pitch motions are in well agreement each other. However, the first-order harmonic amplitudes of heave are significantly under predicted by the present simulations.
Hara, Yutaka,Kawamura, Takafumi,Akimoto, Hiromichi,Tanaka, Kenji,Nakamura, Takuju,Mizumukai, Kentaro Korean Society for Fluid machinery 2014 International journal of fluid machinery and syste Vol.7 No.1
Double-blade vertical axis wind turbines (DB-VAWTs) can improve the self-starting performance of lift-driven VAWTs. We here propose the quadruple-multiple streamtube model (QMS), based on the blade element momentum (BEM) theory, for simulating DB-VAWT performance. Model validity is investigated by comparison to computational fluid dynamics (CFD) prediction for two kinds of two-dimensional DB-VAWT rotors for two rotor scales with three inner-outer radius ratios: 0.25, 0.5, and 0.75. The BEM-QMS model does not consider the effects of an inner rotor on the flow speed in the upwind half of the rotor, so we introduce a correction factor for this flow speed. The maximum power coefficient predicted by the modified BEM-QMS model for a DB-VAWT is thus closer to the CFD prediction.
유체-고체 상호연성 해석을 위한 입자법의 탄성체 모델 개발
황성철(Sung-Chul Hwang),박종천(Jong-Chun Park),정세민(Semin Jeong),Akimoto Hiromichi 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
Recently, some fluid-structure interaction(FSI) problems on the fluid impact loads interacting with structures, such as sloshing, slamming and green-water etc., have been issued especially in ocean engineering field. Governing equations far both elastic solid model and flow model are derived originally from similar principles of continuum mechanics. In this study, an elastic solid model based on a particle method, MPS method, was developed far simulating the FSI problems. And first, ihe developed model was applied to a simple cantilever deflection problem for verification. Then, the model was coupled with a fluid flow model, PNU-MPS method, and applied to the numerical investigation of coupling effects between a cantilever and a mass cf water, which his various density, free-falling to the end of cantilever.
남정우(J.-W. Nam),정세민(S.-M. Jeong),박종천(J.-C. Park),秋元 博路(Hiromichi Akimoto) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
MPS(Moving Particle Simulation) and SPH(Smoothed Particle Hydrodynamics) methods have some serious drawbacks for pressure solution. The pressure field shows spurious high fluctuation both temporally and spatially. One of the reason why the pressure fluctuation is occurred is that free-surface particles are not recognized accurately. The other is the approximation of the partial differential operators. MPS and SPH methods employ a pre-defined kernel function in approximation of the gradient and Laplacian operators. Since the kernel function is constructed artificially, an accurate solution cannot be guaranteed, especially when the distribution of particles is irregular. In this study, we propose a particle simulation method based on the moving least-square technique for solving the partial differential operators by Taylor-series expansion. The developed method was applied to the hydro-static pressure and dam breaking problems for its validation.
파랑 중 선박의 6자유도 운동해석을 위한 중첩격자 기반의 수치해법
허재경(Jae-Kyung Heo),옥유빈(Yu-Bin Ock),황성철(Sung-Chul Hwang),정세민(Se-Min Jeong),박종천(Jong-Chun Park),秋元 博路(Hiromichi Akimoto) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
This paper introduces a computational method for the 6-DOF motions of a ship in waves using an overset grid method which consists of inner and outer domains for body motions and numerical wave tank, respectively. High order numerical schemes are employed to increase numerical accuracy. The numerical schemes and algorithm are addressed. An application to KCS container carrier in head, waves is presented. Comparison on heave and pitch motions shows good agreement with model tests.