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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.
불규칙 파랑 중 직접 예인하는 케이슨의 상판침수에 대한 시간 영역 해석
허재경(Jae-Kyung Heo),박창욱(Chang-Wook Park) 한국해안해양공학회 2016 한국해안해양공학회 논문집 Vol.28 No.1
불규칙 파랑 중에서 직접 예인하는 케이슨의 상판침수에 대한 수치해석을 수행하였다. 패널법을 이용하여 주파수 영역에서의 선형 운동해석을 수행하였고, 통계적 방법을 통해 상판침수를 예측하였다. 시간영역 해석에서는 예인시스템, 환경하중 등을 상세히 구현하여 운동해석을 수행하였고, 상판침수 결과를 주파수 영역에서의 결과와 비교하였다. 또한, 시간 영역 해석에서는 예인선의 수 및 배치에 대한 검토를 수행하여 상판침수 측면에서 예인시스템이 미치는 영향과 운송조건을 고찰하였다. A numerical analysis on deck wetness is carried out for a large caisson directly wet-towed by tugs in irregular waves. A constant panel method is used for linear analysis in frequency domain and a statistical post-processing for the deck wetness is presented. Hydrodynamic coefficients obtained from the frequency domain computation are imported for time domain analysis which enables complete modeling for towing equipment, environment, etc. Both frequency and time domain computations over two sea states are performed and comparison is made. In the time domain analysis, towing systems of various arrangements of tugs are investigated from short-term prediction for the largest deck wetness and the number of occurrences of deck wetness.
점성 수치파랑수조 기술을 이용한 고정된 부유체의 파랑하중 산정
김경미(Kyung-Mi Kim),허재경(Jae-Kyung Heo),정세민(Se-Min Jeong),박종천(Jong-Chun Park),김우전(Wu-Joan Kim),조용진(Yong-Jin Cho) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.3
In the present study, a flow analysis for estimating the wave loads acting on a stationary floating body inside a viscous numerical wave tank was performed using the commercial software FLUENT. The governing equations for the viscous and incompressible fluid motion were the continuity and Navier?Stokes equations, and a piston?type wavemaker was employed to reproduce wave environments. First, the optimal simulation conditions were derived through numerical tests for the wavemaker and wave absorber, and then the wave loads and wave run?up on a vertical truncated cylinder were estimated and compared with the experimental and other numerical results.
김경미(Kyung-Mi Kim),박종천(Jong-Chun Park),이규호(Gyu-Ho Lee),허재경(Jae-Kyung Heo) 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6
To predict the motion of marine vehicles and offshore structures, for a long time, the experiments in a wave tank have been However, these experiments have many difficulties and limitations such as installation, running and maintenance costs, experimental space, measuring devices and methods and so forth. Recently, to overcome these difficulties and limitations, the numerical simulations by utilizing numerical wave tank have been carried out to reproduce the target wave environment and flow-fields. In this study, to find the appropriate computational conditions for the simulations of irregular waves in a numerical wave tank, regular waves were reproduced in a numerical wave tank and the effects of computational conditions were investigated.
석준(Jun Seok),허재경(Jae-Kyung Heo),박종천(Jong-Chun Park) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.5
Lots of orders of special vessels and offshore plants for developing the resources in deepwater have been increased in recent. Because the most of accidents on those structures are caused by fire and explosion, many researchers have been investigated quantitatively to predict the cause and effect of fire and explosion based on both experiments and numerical simulations. The first step of the evaluation procedures leading to fire and explosion is to predict the dispersion of flammable or toxic material, in which the released material mixes with surrounding air and be diluted. In particular turbulent mixing, but density differences due to molecular weight ore temperature as well as diffusion will contribute to the mixing. In the present paper, the numerical simulation of hydrogen dispersion inside a simple-shaped offshore structure was performed using a commercial CFD program, ANSYS-CFX. The simulated results for concentration of released hydrogen are compared to those of experiment and other simulation in Jordan et al.(2007). As a result, it is seen that the present simulation results are closer to the experiments than other simulation ones. Also it seems that the hydrogen dispersion is closely related to turbulent mixing and the selection of the turbulence model properly is significantly of importance to the reproduction of dispersion phenomena.
김학범(Kim Hag-Beom),허재경(Heo Jae-Kyung),이기열(Lee Ki-Yeol) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Heat and fluid flow in the motor block room of a motorized car is numerically simulated. The motorized car, composed of a motor block room and a passenger room, supplies additional power "to achieve the design speed. A motor block, a transformer, and a fan are equipped in the motor block room. Flow phenomena in the ducts on the motor block and power transformer are investigated. Also, the three dimensional heat and fluid flow in the motor block room is simulated to give a qualitative information of the flow characteristics.