Computation of Ventilation Aerodynamics in Singapore’s Kallang Paya Lebar Expressway Underground Tunnel

2003 ◽  
Author(s):  
S. Dayanandan ◽  
M. Damodaran
Keyword(s):  
Fluid Dynamics ◽  
Scenario Planning ◽  
Flow Modeling ◽  
Road Tunnel ◽  
Traffic Jam ◽  
Pollution Levels ◽  
Fire Scenarios ◽  
And Control ◽  
Effective Design ◽  
Ventilation Studies

This work is concerned with the development and application of a computational fluid dynamics based model for predicting all possible ventilation aerodynamic flow, pollution and fire scenarios in an underground road tunnel that is being constructed in Singapore. This work addresses flow modeling for the underground road tunnel ventilation studies, pollution and fire modeling studies and presents the computed results and discussion pertaining to the estimation of pollution levels in the underground road tunnel during a simulated traffic jam and the simulation of vehicular fires in the tunnel and the management and control of a simulated fire in the tunnel by operating flow conditioning and ventilation systems. The model can serve as a tool for enabling the engineers to perform scenario planning for effective design and control of the ventilation inside the tunnel.

Intence Atmospheric Vortices. Edited by L. BENGTSSON and J. LIGHTHILL. Springer, 1982. 326 pp. DM56.- (soft cover). Stability of Thermodynamic Systems. Edited by J. CASAS-VÁZQUEZ and G. LEBON. Springer, 1982. 321 pp. DM 38.- (soft cover). Stability of Mechanics of Continua. Edited by F. H. SCHROEDER. Springer, 1982. 412 pp. DM89.- (hardback). Mécanique Expérimentale des Fluides. Vol. II: Dynamique des Fluids Réels, Turbomachines, 3rd edn. By R. COMOLET. Masson, 1982. 453 pp. FF305.- (soft cover). Engineering Meteorology. Edited by E. PLATE, Elsevier, 1982. 740 pp. $162.75. The Boundary Integral Equation Method for Porous Media Flow. By J. A. LIGGETT and P. L-F. LIU. Allen & Unwin, 1983. 255 pp. £20 (hardback). Methods of Experimental Physics: vol. 18, Fluid Dynamics, Part A. Edited by R. J. EMRICH. Academic, 1981. 404 pp. $50.00 (hardback). Flow, its Measurement and Control in Science and Industry: vol. 2, 1981. Edited by WILLIAM W. DURGIN. Wiley, 1981. 867 pp. £45.75. Flow Visualization II. Edited by W. MERZKIRCH. Hemisphere, 1982. 803 pp. $90.00. Evaporation into the Atmosphere. By W. H. BRUTSAERT. Reidel, 1981. 340 pp. $34.95 Industrial Heat Exchangers: a basic guide. By G. WALKER. Hemisphere, 1982. 408 pp. $41.50. Engineering Fluid Mechanics (with separate Solution manual). By A. MIRONER. McGraw Hill, 1979. 592 pp. £28.50 (cloth), £7.50 (paperback). Unsteady Turbulent Shear Flows. Edited by R. MICHEL, J. COUSTEIX and R. HOUDEVILLE. Springer, 1981, 424 pp. $39.00.

1984 ◽  
Vol 138 ◽  
pp. 436-439
Keyword(s):  
Fluid Dynamics ◽  
Heat Exchangers ◽  
Integral Equation Method ◽  
Boundary Integral ◽  
Porous Media Flow ◽  
Turbulent Shear ◽  
Experimental Physics ◽  
And Control ◽  
Atmospheric Vortices ◽  
Measurement And Control

Novel correlation to evaluate the pressure losses for different traffic jam conditions in road tunnel with alternative jet fan, second part

2020 ◽  
Vol 96 ◽  
pp. 103213 ◽  
Author(s):  
Marilena Musto ◽  
Furio Cascetta ◽  
Carmine D'Alessandro ◽  
Davide De Maio ◽  
Giuseppe Rotondo
Keyword(s):  
Road Tunnel ◽  
Pressure Losses ◽  
Traffic Jam ◽  
Jet Fan

Research of Traffic Flow Guidance System Coordinated with Traffic Control Based on the Key Point of Network

2013 ◽  
Vol 361-363 ◽  
pp. 2185-2190
Author(s):  
Xu Hui Ma ◽  
Bao Tian Dong ◽  
Zhi Jian Wang
Keyword(s):  
Traffic Control ◽  
Urban Traffic ◽  
Guidance System ◽  
Traffic Jam ◽  
Guidance And Control ◽  
Cooperation Strategy ◽  
Traffic Control System ◽  
Traffic Guidance ◽  
Urban Traffic Control ◽  
And Control

It is necessary and essential to coordinate Urban Traffic Control System with Urban Traffic Guidance System, which can integrate traffic facilities and establish the intelligent and economical transportation system. In the paper, we aim to solve the traffic jam of the key point of network utilizing the coordination technology based on the traffic guidance and control. To proving the algorithm, we set a network to simulate the cooperation strategy based on the paper. Simulation results show that the coordination strategy and technology can efftetively release the traffic jam.

scholarly journals Numerical Study of Smoke Propagation in a Simulated Fire in a Wagon Within a Subway Tunnel

2008 ◽  
Author(s):  
Felipe Vittori ◽  
Luis Rojas-Solo´rzano ◽  
Armando J. Blanco ◽  
Rafael Urbina
Keyword(s):  
Numerical Study ◽  
Ventilation System ◽  
Road Tunnel ◽  
Subway Tunnel ◽  
Longitudinal Ventilation ◽  
Emergency Ventilation ◽  
Tunnel Section ◽  
Fire Scenarios ◽  
Subway Stations ◽  
Set Up

This work deals with the numerical (CFD) analysis of the smoke propagation during fires within closed environments. It is evaluated the capacity of the emergency ventilation system in controlling the smoke propagation and minimizing the deadly impact of an eventual fire in a wagon within the Metro de Caracas subway tunnel on the passengers safety. For the study, it was chosen the tunnel section between Teatros and Nuevo Circo subway stations, which consists of two parallel independent twin tunnels, connected through a transverse passage. The tunnels are provided by a longitudinal ventilation system, integrated by a set of reversible fans located at both ends of the tunnels. Three stages were considered in the study: (a) Model set up; (b) Mesh sensitivity analysis; (c) Validation of the physical-numerical parameters to be used in the numerical model; and (d) Simulation of fire scenarios in Metro de Caracas subway stations. Stages (b)–(c), aimed to testing and calibrating the CFD tool (ANSYS-CFX10™), focused on reproducing experimental data from Vauquelin and Me´gret [1], who studied the smoke propagation in a fire within a 1:20 scale road tunnel. Stage (d) critical scenarios were established via a preliminary discussion with safety experts from Metro de Caracas, in order to reduce the computer memory and the number of simulations to be performed. The analyses assessed the reliability of escape routes and alternative paths for the evacuation of passengers. Additionally, the smoke front movement was particularly computed, as a function of time, in order to determine the possible presence of the “backlayering” phenomenon [5]. Results demonstrate the strengths and weaknesses of the current ventilation system in the event of a fire in the subway tunnel, and suggest new strategies to address this potentially lethal event to minimize the risks for passengers.

Sign in / Sign up

Export Citation Format

Share Document