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Hong Namseeg(홍남식) 동아대학교 해양자원연구소 1999 동아대학교 해양자원연구소 연구논문집 Vol.12 No.-
라이저의 비선형 동적해석을 위해 유도된 모델의 근사형에 Iwan-Blevin의 모델을 결합하여 파이프 주변에 발생하는 소용돌이로 인한 라이저의 동적거동해석을 위한 수치 해석 모델을 개발한다. 제안된 수학적 모델에 Galerkin의 유한요소 근사화법을 적용하여 라이저의 동적거동을 수치해석해 본다. 수치해석결과, vortex로 인한 라이저의 일반적인 거동특성을 정확하게 나타내어 해석모델로서의 유용성을 검증하였다. Combining Iwan-Blevin"s model into the approximated form of the nonlinear model derived for the dynamic analysis of the riser due to vortex-shedding, numerical model is proposed to estimate dynamic responses of riser due to vortex shedding by inline current. Galerkin"s finite element approximation is implemented to obtain numerical solution. The numerical results are inspected through the physical interpretation to give the verification and usefulness of the suggested numerical model.
선박의 연속적 접 · 이안이 항내 해수순환에 미치는 영향
홍남식(Namseeg Hong) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.3
In this study, the model developed by Hong (2012) was modified to describe the consecutive docking/undocking situation and was also applied to investigate the effect on seawater circulation in Busan port by consecutive docking/undocking at the connecting bridge of Busan port. Numerical experiments for various docking/undocking cases were performed by dumping the initial concentration within Busan Port and indicated that the concentration in Busan port becomes steady state without numerical wiggles after sufficient time (at least 20 or 30 days). In addition, it was found that the seawater circulation under ship docking was slightly reduced in comparison with that under ship undocking, and the approach time to the target concentration under all the docking cases increased in comparison with the undocking case.
수평 이류항의 공간이산화 개선을 통한 급변 유동의 효율적 해석
홍남식(Namseeg Hong) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
In this study, the numerical model developed by Hong et al.(2008) was improved to be applied to rapidly varying flows such as the inundation of dry land or flow transitions due to large gradients of the bathymetry. A numerical approximation was applied that was consistent with the conservation of momentum in flow expansions and with the Bernoulli equation in flow contractions. The approximation was second order, but the accuracy reduced to first order near extreme values by the use of a minmod limiter. The modified model was verified by a comparison with the theoretical critical depth of weir, and for sufficiently smooth conditions and a fine grid size, both approximations converged to the same solution. In terms of the grid size, it was more effective at obtaining solutions than the previous model and reproduced the inundation of dry land.
홍남식(NAMSEEG HONG),김가야(GAYA KIM),강윤구(YOON-KOO KANG) 한국해양공학회 2008 韓國海洋工學會誌 Vol.22 No.3
In this study, a mathematical model for flow with silt protector is proposed that adds a second-order energy loss term in the momentum equation. The three-dimensional numerical model was developed based on mathematical models and verified through comparison with flume test results. Loss coefficients were evaluated through the flume tests and applied to the numerical model. It was found through the investigation of various example cases that the downstream flow pattern was affected mainly by penetration of the silt curtain, not by the approach velocity, and also that the blocking effect of velocity was increased by the increase in mesh density of the silt curtain, below a certain mesh density. The blocking effect did not increase further above a certain mesh density.
부산신항 건설이 진우도 주변 해저지형 변화에 미치는 영향
홍남식(Namseeg Hong) 한국해양공학회 2018 韓國海洋工學會誌 Vol.32 No.3
In this study, a qualitative evaluation of the morphological changes in the seabed surrounding Jinwoo-Island due to the construction of the new Busan port were determined through a numerical simulation. Various scenarios for the discharge of the Nakdong river estuary dam and construction stage of the new Busan port were established and utilized for an indirect and qualitative investigation through simulation using the numerical model implemented in this study. It was concluded through a qualitative study that the morphological changes in the seabed surrounding Jinwoo-Island were typical estuary seabed changes due to the discharge of the Nakdong river estuary dam and waves from the open sea. The effects from the construction of the new Busan port were relatively small.
3차원 수치모형실험을 통한 오탁방지막의 오염물질 및 준설토 확산 저감특성 조사
홍남식(Namseeg Hong) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.4
This study investigates reducing characteristics for the spreading of dredged soil and the diffusion of contaminant by silt protector curtain through three dimensional numerical experiment. The numerical medel is modified by combining the sediment transport characteristics for cohesive sediment into the previously developed model. Several numerical experiments have been given in order to investigate the reducing effect of silt protector using two dimensional numerical channel model under various parameters such as upstream flaw velocity, depth of silt curtain and the position of dumped materials. Through the evaluation of several simulation results, we knew that the careful design has to be given in the determination of depth and position of silt protector.
홍남식(Hong Namseeg),박기정(Park Kijung) 동아대학교 해양자원연구소 2002 동아대학교 해양자원연구소 연구논문집 Vol.14 No.-
This study investigates the efficiency of upwelling device proposed by Liu, according to the variation of a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension. The mathematical and numerical model is again analyzed on the basis of Liu"s model. The results given through the parametric study indicate that an upwelling flow rate increases when a wave height, wave frequency, the length and sectional area of a tail pipe, and a buoy dimension increase.
홍남식(Hong Namseeg) 동아대학교 해양자원연구소 2003 동아대학교 해양자원연구소 연구논문집 Vol.15 No.-
This study is to investigate the effect of wave in the transport and diffusion of dredging soil by considering the interactive action between tidal current and wave for the prediction of the transport and diffusion process of dredging soil. Mike21, which is known as a commercial software, is used as an numerical model and nearshore wind wave model is selected to estimate wave field. It is found through the investigation, which has been made from an numerical simulation of the construction of Busan new port, that the dredging soil under the interactive action between tidal current and wave is more transported and diffused relatively to the wider extent than one without wave action. It seems to be the reason why the sediment transpoted to the open sea is resuspended and diffused again by the wave action.