Experimental and numerical analyses of train-induced unsteady tunnel flow in subway

Kim, J.Y.; Kim, K.Y.

doi:10.1016/j.tust.2006.06.001

Cited by 153 publications

(66 citation statements)

References 10 publications

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“…The standard k-ε turbulence model based on the RANS equation was used (Kim and Kim, 2007;Cao et al, 2012). The flow status options were set to steady, incompressible, no-slip wall, and three-dimensional.…”

Section: Numericalmentioning

confidence: 99%

“…The velocity inlet boundary condition was set for the tunnel entrance while the pressure outlet boundary condition was set for the tunnel exit. For the solution method, the SIMPLE scheme was set for pressure-velocity coupling, and the second order upwind discretization scheme was chosen to discretize the governing equations (Kim and Kim, 2007). The convergence criteria were set at 10 -3 for the continuity and momentum equations and 10 -6 for the energy equation.…”

Section: Numericalmentioning

confidence: 99%

See 1 more Smart Citation

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

Sim

Yoon²,

Woo

et al. 2017

Aerosol Air Qual. Res.

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In underground tunnels, friction between the wheels and rails of subway trains creates particles, which are spread by the wind generated when trains pass by. A louver dust collector was attached to the bottom of a T-car of Seoul Subway Line 5 train in an effort to remove PM 10 inside tunnels, and obtain data when it was in actual operation. It made several round trips during which differential pressure of the louver dust collector was measured in relation to train speed. By comparing and verifying the differential pressure estimated by simulation and that actually measured, it was possible to estimate average flow of air that went into the louver dust collector. Furthermore, by comparing and verifying the measurement results on collection efficiency of a lab-scale louver dust collector in a wind tunnel, along with the results of numerical analysis, it was possible to estimate the collection efficiency in relation to subway train speed. As a result, it was confirmed that higher running speeds of subway trains increased the flow of air going into the louver dust collector and subsequently decreased the particle size corresponding to 50% collection efficiency. In other words, the cut-off size was estimated to be 9.7 µm at the lowest speed of 5 km h -1 , and 4.9 µm at the top speed of 65 km h -1 , in normal speed range for the Seoul Subway Line 5 trains.

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Section: Numericalmentioning

confidence: 99%

Section: Numericalmentioning

confidence: 99%

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

Sim

Yoon²,

Woo

et al. 2017

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

show abstract

“…Numerical simulation always uses software such as CFDesign [11], PHOENICS [12], and CFX [13]. These programs use the Reynolds averaging method for simulation and the control equation, which consists of the continuity equation, the momentum equation, the energy equation, and the turbulent kinetic energy equation, to analyze the flow characteristics of the air station.…”

Section: The Numerical Simulation Toolsmentioning

confidence: 99%

A Review of the Piston Effect in Subway Stations

Pan

Fan

Liu

et al. 2013

Advances in Mechanical Engineering

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In recent years the piston effect in subways has become a topic of interest for researchers and engineers. Many publications have appeared on this topic, but reliable information is scattered and poorly organized. This review paper covers the latest publications on the piston effect in subways. We compile information about the mechanism of the piston effect, evaluate its influence, and describe how it can be effectively utilized.

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“…J.Y. Kim et al adopts the dynamic mesh method to study the pressure change in the subway train during the variable speed operation in 2007 [8] .…”

Section: Introductionmentioning

confidence: 99%

Influence of Apron and Equipment Cabin on Aerodynamic Characteristics of Intercity Train

Tao¹,

Liu²,

Du³

et al. 2017

dtetr

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The objective of this study was to investigate the influence of apron and equipment cabin on aerodynamic characteristics of intercity train using numerical simulation. Then aerodynamic force of the train in the open air and crosswind, pressure changes of the train and tunnel were obtained. The results show that the intercity train with apron or equipment can reduces drag, which mainly reduces the pressure differential drag more than 7%. The train with apron has better crosswind stability than with equipment cabin because of the smaller windward area, and obviously it does not better than the original train. And the train with apron also has better performance of passing tunnel than with equipment cabin and the original train.

show abstract

Experimental and numerical analyses of train-induced unsteady tunnel flow in subway

Cited by 153 publications

References 10 publications

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

Performance Estimation of a Louver Dust Collector Attached to the Bottom of a Subway Train Running in a Tunnel

A Review of the Piston Effect in Subway Stations

Influence of Apron and Equipment Cabin on Aerodynamic Characteristics of Intercity Train

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