الفهرس 
Numerical investigation for smoke spread in an underground subway station
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Abstract
This research presents a numerical study of smoke spread in underground subway station. This research investigates the effect of exhausting smoke by single point extraction and exhausting smoke by multi-point extraction on smoke spread inside the station, plug-holing phenomenon and passengers{u2019} life safety. Also, effect of adding smoke barriers at stairs entrance on smoke spread inside the station, plug-holing phenomenon and passengers{u2019} life safety is studied. Evacuation time is predicted for different combustion model and different number of people. Fire Dynamics Simulator (FDS) software version 5.5.3 is utilized to simulate 9 case studies in 150 m long, 20 m wide and 13 m height domain with a subway car fire source simulated as a fire with a unsteady heat release rate of 35 MW resulted from burning Heptane as a fuel. Results show that exhausting smoke by multipoint extraction system in underground subway station gives better performance than single point extraction system