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연계 후류진동 모델 적용을 통한 와류방출 가진에 의한 라이저의 동적해석
홍남식,허택녕 한국해안해양공학회 2000 한국해안해양공학회 논문집 Vol.12 No.3
면내 조류흐름에 의해 발생하는 와류방출 가진으로 인한 라이저의 동적거동해석을 위한 수치해석 모델을 개발한다. 수치해석 모델개발을 위해 Galerkin의 유한요소 근사화법을 적용하였으며 와류방출 가진은 Blevins에 의해 제안된 연계 후류진동 모델을 사용하였다. 와류방출로 인한 라이저의 일반적인 거동특성을 수치해석 결과와 비교분석함으로써 모델의 유용성을 검증하였다. Numerical model is proposed to estimate dynamic responses of riser with vortex excitation by inline current. Galerkin's finite decomposition method is implemented for the development of a numerical model and vortex excitation is modeled by coupled wake oscillator proposed by Blevins. The numerical results are inspected through the physical interpretation to give the verification and usefulness of the suggested numerical model.
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홍남식,김정윤 한국해안해양공학회 2002 한국해안해양공학회 논문집 Vol.14 No.3
본 논문에서는 조위변화에 따른 오탁방지막 계류라인의 거동을 조사하였다. 거동분석으로부터 안전율을 고려하여 팽팽하게 적정케이블의 길이를 정하면 수심이 하강하더라도 긴장측 케이블은 거의 일정한 장력을 유지하는 것을 알 수 있었다 그러나, 이완케이블의 기능은 상실되어 구조체 전체의 불안정성을 초래할 수도 있는 것을 알 수 있었다. 또한, 초기 직선긴장각이 계류거동에 미치는 영향을 조사해봄으로써 케이블 장력, 수중부상길이 케이블길이(재료량과 관계 있음)및 부체변위 등을 복합 고려하면서 계류 해석하여야만 적정한 설계를 할 필요가 있을 것으로 보였으며, 막체의 부착물로 인한 케이블의 장력은 줄어들어 재료손상은 일으키지 않으나 저면 앵글, Total scope 및 부체변위에 영향을 미쳐 구조물 전체의 불안정성을 초래할 수 있다는 것도 알 수 있었다. This paper studies the behavior of mooring line of silt protector according to the change of sea level. It is found from the analysis of the behavior that if the taut cable length has been determined appropriately within the range of safety factor, the tensioned cable has almost constant tension regardless of the water depth. The whole structure, however, becomes unstable due to the loss (zero tension) of the released cable tension. It is also recognized from the investigation for the effect of intial straight line angle on the behavior of mooring line that the design through the conceptually combined consideration of the cable tension, total scope and buoy deflection has to be required in the mooring analysis. Finally, the material of cable is not damaged because the cable tension is reduced by attached shellfish, but the whole structure may be also unstable by the effect on the anchor angle, total scope and buoy deflection.
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조류력에 의한 말뚝 부착 폐타이어의 구조해석에 관한 연구
홍남식,김기수 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.29 No.1
In this study, structural analysis of worn tire to current forces is performed to investigate its behavior charateristics. For the behavior analysis of worn tire, finite element model representing orthotropic material of tire, SAP, and ANSYS are applied. In case of finite element model used in this study, the material and geometric nonlinearities are not considered. And also, the analysis of large deformation and the contact element of three dimensional structure is not given in SAP. Two dimensional link element may be used in stead of contact element. Mean while, ANSYS provides three dimensional contact elements in order to do contact analysis and give the supplementary results which SAP doesn't cover.
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홍남식,박기정 東亞大學校 海洋資源硏究所 2002 硏究論文集 Vol.14 No.1
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.
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유한요소법을 이용한 말뚝부착 폐타이어의 파랑력에 의한 유사 정적해석
홍남식,고신택 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1
The quasi-static analysis of worn tire attached to pile by wave forces has been investigated through the numerical method. Finite element model has been developed by cosidering that the composite material of rubber and cord is orthotropic, the rubber is isotropic and also by regarding that all the material behaves as linear elastic. The pressure distribution by wave around the worn tire has been estimated through the adjustment for the concept of flow seperation. It is found that the worn tire subjected to wave loading experiences very large deformations which may result the failure by wave action.
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홍남식,천제호 東亞大學校 附設 環境問題硏究所 2004 硏究報告 Vol.26 No.-
This study investigates the change of tidal flow pattern inside port due to the development of Busan New-Port. Numerical simulations are performed using commercial software to predict tidal flow change for every construction scenario. It is found from the simulation results that the speed of current is increased at the narrow channel between Yokmang mountain and B dike after the construction completion of dike, while the pattern and magnitude of current at Angol area is not changed because of the slight increase of current speed at Wasung Bay or Woong-Dong Bay. Therefore, the flow rate of sea water through the narrow channel and the circulation within bay is decreased after the construction of dike. Also, the speed and flow rate of current at Yongwon area is rapidly reduced after the construction of north container berth and then, the circulation and change of sea water becomes almost impossible.
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홍남식 東亞大學校 環境問題硏究所 2005 硏究報告 Vol.27 No.1
This study investigates the influence of silt protector on three dimensional tidal flow. Three dimensional numerical simulations are performed using commercial software to estimate tidal flow change by silt protector. Sigma-coordinate in vertical direction and staggered grid system in horizontal domain are implemented to construct numerical model. And also, silt protector is considered as a porous plate controlling volumetric flow as frictinal term. Silt protector plan for Busan New Port Construction is used to evaluate the influence on three dimensional tidal flow pattern. Simulation results show that flow speed near silt protector is reduced and that the reduced magnitude of speed depends on the frictional coefficient. However, the flow speed at open area under silt protector is slightly increased in comparison with that of closed area by silt protector.
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홍남식 東亞大學校 海洋資源硏究所 2003 硏究論文集 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 transported to the open sea is resuspended and diffused again by the wave action.
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