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황성철(S.C. Hwang),이병혁(B.H. Lee),박종천(J.C. Park) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.1
The violent free-surface motions and the corresponding impact loads are numerically simulated by using the Moving Particle Semi-implicit (MPS) method, which was originally proposed by Koshizuka and Oka (1996) for incompressible flows. In the original MPS method, there were several shortcoming including non-optimal source term, gradient and collision models, and search of free-surface particles, which led to less-accurate fluid motions and non-physical pressure fluctuations. In the present study, how those defects can be remedied is illustrated by step-by-step improvements in respective processes of the revised MPS method. The improvement of each step is explained and numerically demonstrated. The numerical results are also compared with the experimental results of Martin and Moyce (1952) for dam-breaking problem. The current numerical results for violent free-surface motions and impact pressures are in good agreement with their experimental data.
붕괴파의 사각기둥에 미치는 유체충격력 예측을 위한 3차원 다상류 시뮬레이션
정세민(S.-M. Jeong),황성철(S.-C. Hwang),박종천(J.-C. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In this study, impact loads on the tank walls by sloshing phenomena and on a tall structure in a three-dimensional rectangular tanks were predicted by multiphase flow simulations. The solver is based on CIP/CCUP(Constraint Interpolation CIP/CIP Combined Unified Procedure) method and THINC-WLIC(Tangent Hyperbola for Interface Capturing-Weighted Line Interface calculation) method was used to capture the air-water interface. For the convection terms of Navier-Stokes equations, the USCIP (Unsplit Semi-Lagrangian CIP) method was adopted. The results of simulations were compared with those of experiments. Overall comparisons were reasonably good.
슬로싱 해석을 위한 CCUP 기반 시뮬레이션 기술 개발
박종천(J. C. Park),황성철(S. C. Hwang),정세민(S. M. Jeong) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
A new computational program, which is based on the CIP/CC3P (Constraint interpolation profile/CIP Combined Unified Procedure) method, has been constructed to numerically analyse violent sloshing phenomena dealt as multiphase-flow problems. Two-dimensional sloshing problems in a rectangular tank were solved by the developed method in a stationary Cartesian grid. For the convection terms of Navier-Stokes equations, the RCIP(Rational function CIP) method was adopted and the THINC-WLIC(Tangent of Hyperbola for Interface Capturing-Weighted Line Interface Calculation) method was used to capture the air/water interface. The computational results are compared with those of experiments to validate the present numerical method.