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대심도 지하역사에서의 화재시 플랫폼 스크린 도어에 의한 열, 연기 거동 영향 분석
장용준(Y. J. Jang),김학범(H. B. Kim),이창현(C. H. Lee),정우성(W. S. Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this study, fire simulations were performed to analyze the characteristics of the fire driven flow and the effects of the platform screen door on the smoke flow in the station, when the fire occurred in the center of the platform. Soongsil Univ. station (line number 7, 47m in depth underground) was chosen which was the one of the deepest underground subway stations in the Seoul metro, SMRT. The parallel computational method was employed to compute the heat and mass transfer eqn's with 6 CPUs of the linux clustering machine. The fire driven flow was simulated with using FDS code in which LES method was applied. The Heat release rate was 10㎿ and The Ultrafast model was applied for the growing model of the fire source. The 10,000,000 structured grids were used
PIV 기법을 이용한 모형철도터널 직관덕트에서 유동 분포 계측 및 수치해석 결과와의 비교분석
장용준(Y.J. Jang),정우성(W.S. Jung),박일순(I.S. Park) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.3
The turbulent flows in a tunnel mock-up(10L×0.5W×0.25H m3 : scale reduction 1/20) with rectangular cross section were investigated. The instantaneous velocity fields of Re = 49,029, 89,571 were measured by the 2-D PIV system which is consisted of double pulsed Nd:Yag laser and the tracer particles in the straight-duct mock-up where the flows were fully developed. The mean velocity profiles were taken from the ensemble averages of 1,000 instantaneous velocity fields. Simultaneously, numerical simulations(RANS) were performed to compare with experimental data using STREAM code. Non-linear eddy viscosity model (NLEVM : Abe-Jang-Leschziner Eddy Viscosity Model) was employed to resolve the turbulent flows in the duct. The calculated mean velocity profiles were well compared with PIV results. In the log-law profiles, the experimental data were in good agreement with numerical simulations all the way to the wake region except the viscous sub-layer (near wall region).
병렬(슈퍼) 컴퓨터를 이용한 대심도 지하역사 화재 유동 해석
장용준(Y. J. Jang),김학범(H. B. Kim),이창현(C. H. Lee),정우성(W. S. Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Tunnel Wind is occurred by various causes of gradients of railway, locally different temperature and car moving in the subway. In this study, transient numerical-simulations were performed to analyze the effects of the platform screen door and tunnel wind on the fire driven smoke and heat flow in the station, when the fire occurred in the center of the platform. Soongsil Univ. station (line number 7, 47m in depth underground) was chosen which was the one of the deepest underground subway stations in the Seoul metros. The 16 cores of linux clustering-computer were employed for fast calculation of 10,000,000 structured-grids. The fire driven flow was simulated with FDS code in which LES method was applied. The Heat release rate was 10㎿ and The Ultrafast model was applied for the growing model of the fire source.
장용준(Y. J. Jang),김학범(H. B. Kim),이창현(C. H. Lee),정우성(W. S. Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In the studying The comparative analysis was performed using numerical simulation for various smoke exhaust and control system against fire in the deeply underground subway station. When the fire occurred in the platform of deeply underground subway station, the evacuation way to exit is long and by way of the concourse. Therefore, the toxic gas inflows should be prevented and delayed to concourse from fire to save passengers' life. In the paper The numerical analyses for various operating in connection with smoke exhaust/control systems of concourse and platform were showed for preventing smoke-inflow into the evacuation way from the fire in the platform of deeply underground subway station.
대심도 지하역사에서 화원 위치에 따른 연기거동 특징 연구
김학범(H.B. Kim),장용준(Y.J. Jang),이창현(C.H. Lee),정우성(W.S. Jung) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
In this study, Numerical simulations were pelf armed 10 analyze the characteristics of fire driven smoke flow for different location of fire source in the deeply underground subway station with using FDS code. The fire driven smoke-flow which was simulated by using Parallel Computational Method for fast calculation and LES for turbulence model. In this research, the fire location to obstruct a suitable egress from the fire disaster were discussed.
최춘범(C.-B. Choi),장용준(Y.-J. Jang),양경수(K.-S. Yang) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Floquet stability analysis has been carried out to detect the onset of the secondary instability in the laminar flow past a two-dimensional angulated obstacle. The shape of the obstacles considered here includes a normal flat plate up to square cylinder as the aspect ratio(AR) varies. As AR decreases, mode B and mode QP vanish and mode A2 and mode QP2 emerge. This has not been observed in case of flow past a square cylinder. Mode A2 has an odd RT(Reflection Translation) symmetry, and the dominant spanwise wavelength of mode A2 is much shorter than that of mode A. On the other hand, the dominant spanwise wavelength of mode QP2 is about twice longer than that of mode QP. In a partial range of AR, mode A instability becomes unstable and then stable again as Re increases. This distinctive phenomenon can be seen via a closed curve on the neutral stability diagram. Three dimensional calculations of some selected cases were performed for validation.
수직방향으로 정렬된 정사각주 후류에서의 3차원 불안정성
최춘범(C.-B. Choi),장용준(Y.-J. Jang),윤동혁(D.-H. Yoon),양경수(K.-S. Yang) 한국전산유체공학회 2010 한국전산유체공학회지 Vol.15 No.2
Secondary instability in the flow past two square cylinders in side-by-side arrangements is numerically studied by using a Floquet analysis. The distance between the neighboring faces of the two cylinders (G) is the key parameter which affects the secondary instability under consideration. In this paper, we present the critical Reynolds number for the secondary instability and the corresponding spanwise wave number of the most unstable (or least stable) wave for each G. Our results would shed light on a complete understanding of the onset of secondary instability in the presence of two side-by-side square cylinders.
횡방향으로 정렬된 2개의 정사각주 후류에서의 3차원 불안정성
최춘범(C.-B. Choi),장용준(Y.-J. Jang),윤동혁(D.-H. Yoon),양경수(K.-S. Yang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Three-dimensional linear instability in the flow past two square cylinders in side-by-side arrangements are numerically studied by using a Floquet analysis. The distance between the neighboring faces of the two cylinders (G) is the key parameter which affects the secondary instability under consideration. In this paper, we plan to present the critical Reynolds number for the three-dimensional instability and the corresponding spanwise wave number of the most unstable (or least stable) wave for each G. Our results would shed light on a complete understanding of the onset of three-dimensional instability in the presence of two side-by-side square cylinders.