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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.