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남성원(S.W. Nam) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
Algorithm for pedestrian flow analysis based on DEM(Discrete Element Method) is newly developed. There are lots of similarity between particle-laden two phase flow and pedestrian flow. The velocity component of carrier phase corresponds to the direction vector of calculation cell, dispersed phase to people, volume fraction to population density and the momentum equation of particle to the walking velocity and way-finding method of passenger. And, the walking velocity of passenger is also represented by the function of population density. Key algorithms are developed to determine the position of people, population density and numbering method. To verify the effectiveness of algorithm for pedestrian flow analysis, simulations for representative simple models are conducted. By using the developed simulation program, We can simulate the movement of massive crowd qualitatively and quantitatively.
남성원(S.W. Nam),권혁빈(H.B. Kwon),윤수환(S.H. Yun) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
Pressure waves are generated and propagate in tunnel when train enters a tunnel with high speed. Compression wave due to the entry of train head propagates along the tunnel and is reflected at tunnel exit as expansion wave. While expansion wave due to the entry of train tail propagates along the tunnel and is reflected at tunnel exit as compression wave. These pressure waves are repeatedly propagated and reflected at tunnel entrance and exit. Severe pressure change per second causes ear-discomfort for passengers in cabin and micro pressure wave around tunnel exit. It is necessary to analyze the transient pressure phenomena in tunnel qualitatively and quantitatively, because pressure change rate is considered as one of major design parameters for an optimal tunnel cross sectional area and the repeated fatigue force on car body. In this study, we developed the characteristics method analysis based on fixed mesh system and compared with the results of real train test. The results of simulation agreed with that of experiment.
남성원(S.W. Nam),윤수환(S.H. Yun),권혁빈(H.B. Kwon) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
Pressure waves are generated and propagate in tunnel when train enters a tunnel with high speed. Compression wave due to the entry of train head propagates along the tunnel and is reflected at tunnel exit as expansion wave. While expansion wave due to the entry of train tail propagates along the tunnel and is reflected at tunnel exit as compression wave. These pressure waves are repeatedly propagated and reflected at tunnel entrance and exit. Severe pressure change per second causes ear-discomfort for passengers in cabin and micro pressure wave around tunnel exit. It is necessary to analyze the transient pressure phenomena in tunnel qualitatively and quantitatively, because pressure change rate is considered as one of major design parameters for an optimal tunnel cross sectional area and the repeated fatigue force on car body. In this study, we developed the characteristics method analysis based on fixed mesh system and compared with the results of real train test. The results of simulation agreed with that of experiment.
수치해석기법에 따른 고속선 터널 압력파 전산해석결과 비교
윤수환(S.H. Yun),권혁빈(H.B. Kwon),남성원(S.W. Nam),홍재성(J.S. Hong) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
When a high-speed train enters a tunnel, tunnel pressure wave such as compression wave and expansion wave generates and propagate toward a tunnel exit. The first compression wave makes Micro-pressure wave and mostly reflected as it arrives at the tunnel exit. 1D characteristic equation or 2D axisymmetric equation is usually used to analyze the tunnel pressure wave. This paper shows comparison between results by the two numerical methods and field measurement data of tunnel pressure wave and miro-pressure wave at Hyun-an tunnel. First compression wave of both numerical method well estimated the value and trend of the measurement data. However, as the pressure wave propagates, the difference between numerically computed results and measurement data gradually increased due to friction.
남성원(S. W. Nam) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Pressure waves are generated and propagate in tunnel when train enters a tunnel with high speed. Compression wave due to the entry of train head propagates along the tunnel and is reflected at tunnel exit as expansion wave. While expansion wave due to the entry of train tail propagates along the tunnel and is reflected at tunnel exit as compression wave. These pressure waves are repeatedly propagated and reflected at tunnel entrance and exit. Severe pressure change causes ear-discomfort for passengers in cabin and micro pressure wave around tunnel exit. It is necessary to analyze the transient pressure phenomena in tunnel qualitatively and quantitatively, because pressure change rate is considered as one of major design parameters for an optimal tunnel cross sectional area and the repeated fatigue force on car body. In this study, we developed the characteristics method based on fixed mesh system and boundary conditions for crossing trains and analyzed with X-t diagram. The results of simulation show that the pattern of pressure variation in tunnel varies for the entry condition of crossing train.