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화재 발생 지하철 역사에서의 여객 대피 해석에 관한 연구
김치겸(Chi Gyeom Kim),이성원(Sung Won Lee),허남건(Nahmkeon Hur),남성원(Seong Won Nam) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In the present study, a numerical simulation of passenger evacuation in a subway station was performed. Algorithm for passenger flow analysis based on DEM(Discrete Element Method) has been improved to simulate passenger flow in detailed geometry. The effect of grid density was assessed in the present study to show the advantage of using finer grid in the simulation. The method of coupling passenger flow and fire simulation has also been investigated to analyze passenger evacuation flow under fire. In this method the CO distributions in the subway station was used to assess fire hazards of passenger by means of FED(Fractional Effective Dose) model. Using the coupled algorithm a simulation for passenger evacuation flow and fire analysis were performed simultaneously in the simplified subway station. This algorithm could be used in the design of subway station for the purpose of passengers' safety in case of fire.
배플 형상에 따른 교반기 내부 고체입자 분포의 비정상상태 해석
김치겸(Chi Gyeom Kim),원찬식(Chan-Shik Won),허남건(Nahmkeon Hur) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
In the present study, a numerical simulations are investigated in a stirred solid/liquid system by using Eulerian multi-phase model. The transient flow field of liquid phase and distribution of solid particles are predicted in stirred tanks consisting of 4-pitched paddles impeller and baffles. The effects of number and width of baffles on the mixing time and the quality of solid suspension in a stirred tank are presented numerically. The result shows that the mixing time decreases as the width and number of baffles increase.
화재 발생 지하철 역사에서의 여객 대피 해석에 관한 연구
김치겸(Chi Gyeom Kim),이성원(Sung Won Lee),허남건(Nahmkeon Hur),남성원(Seong Won Nam) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.8
A numerical simulation of passenger evacuation in a subway station was performed by coupling the passenger flow analysis and the fire simulation. The algorithm of the passenger flow analysis was based on a DEM (Discrete Element Method) using the potential map of the direction vector for each passenger. This algorithm was improved in the present study as to use finer grid smaller than a passenger in order to resolve detailed geometry of the station and to resolve the behavior of passengers in the bottleneck at the ticket gate considering the collision of passengers to a wall or with other passengers. In the fire simulation, the CO distribution predicted by using CFD was used to take into account the effect of toxic gases on the passengers' mobility. The methodology proposed in the present study could be used in designing safer subway station in case of fire occurrence.
DEM에 기초한 여객유동 해석을 위한 전/후처리 프로그램 개발
김치겸(Chi Gyeom Kim),원찬식(Chan-Shik Won),허남건(Nahmkeon Hur),남성원(Seong Won Nam) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
A pre/post processor program based GUI(Graphic User Interface) by using the MFC and OpenGL library in the Windows OS have been developed for the analysis of the passenger flow. Using this program, users are able to generate and modify the meshes of multi-storied subway station, set all the parameters for the solver, and obtain the results of the simulation such as transient passenger motions and passenger streak lines in 3-dimensional graphic view.
전산유체역학을 이용한 교반기 내부의 고체/액체 다상유동 해석
김치겸(Chi Gyeom Kim),원찬식(Chan-Shik Won),허남건(Nahmkeon Hur) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
Glass particle distribution in a stirred solid/liquid systems was investigated using computational fluid dynamics(CFD). The numerical results were compared to experimental data from the available literature which investigated the local dispersed phase volume fraction by means of an endoscope technique, Eulerian multi-phase model and applications considered high loading of solid particle was used to investigate the influence of the particle concentration and mixing tank size on the solid distribution. A good agreement was obtained between the experimental data and simulation results. The results showed different solid particle distribution in an agitator by particle concentration and mixer size.
배플 형상에 따른 교반기 내부 고체입자 분포의 비정상상태 해석
김치겸(Chi Gyeom Kim),이승재(Seung-Jae Lee),원찬식(Chan-Shik Won),허남건(Nahmkeon Hur) 한국전산유체공학회 2009 한국전산유체공학회지 Vol.14 No.4
In the present study, numerical simulations were performed in a stirred solid/liquid system by using Eulerian multi-phase model. The transient flow field of liquid and distribution of solid particles were predicted in the stirred tank with pitched paddle impeller and baffles. The Frozen rotor method is adopted to consider the rotating motion of the impeller. The effects of number and width of baffles on the mixing time and the quality of solid suspension in the stirred tank are presented numerically. The result shows that the mixing time decreases as the width and number of baffles increase. The present numerical methodology can be applied to optimizing mixing condition of industrial mixer.