Volume 13, Issue 15 (Third Special Issue 2014)                   Modares Mechanical Engineering 2014, 13(15): 10-22 | Back to browse issues page

‎ 20.1001.1.10275940.1392.13.15.3.3

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Mapar M, Heidarinejad G, Pasdarshahri H. Numerical Investigation of Two Simultaneous Fires in a Tunnel and Evaluation of the Obstructive Influence of Vehicles by Large Eddy Simulation. Modares Mechanical Engineering 2014; 13 (15) :10-22
URL: http://mme.modares.ac.ir/article-15-1927-en.html
Numerical Investigation of Two Simultaneous Fires in a Tunnel and Evaluation of the Obstructive Influence of Vehicles by Large Eddy Simulation
Maryam Mapar , Ghassem Heidarinejad * 1, Hadi Pasdarshahri
1- Tehran, Ale Ahmad Ave, Tarbiat Modares University, Department of Mechanical Engineering, Room 309
Abstract:   (5880 Views)
In this paper a simulation of two fires in a tunnel in which varied arrangements of different sized vehicles at the upstream of fires has been accomplished using FDS. The results reveal that the behavior of two fires is directly influenced by distance between them. The calculated critical velocity is not affected by the variations on the small vehicles arrangement and distance between the vehicles and fires. Interestingly, the presence of medium vehicles leads ventilation flow to strengthen inertial force rather than buoyant force of fire plume in tunnel. Accordingly, when there is a short distance between fires and obstructions, less air ventilation is needed to prevent smoke backlayering. Eventually, far distance between the vehicles and the fires results in vanishing obstruction effects. Consequently, the critical velocity is the same as the case in which there is no vehicle in the tunnel.
Keywords: Tunnel, Fire, Large Eddy Simulation, Critical velocity
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Article Type: Research Article | Subject: Combustion|Heat & Mass Transfer|Turbulance|CFD
Received: 2013/07/26 | Accepted: 2013/09/11 | Published: 2014/02/20
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