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Abstract
Smoke is the most deadly factor in vehicular tunnels fire since smoke spreads in heading harmonize with passenger{u2019}s evacuation way. It reduces visibility and can cause fatalities by suffocation. This research presents a numerical study of the effect of extracting the smoke by different system of ventilation on smoke spread inside the vehicular tunnel, like (water mist system with transverse ventilation and longitudinal system with jet fans and solid curtain with transverse system and semi transverse system) Also tenable conditions were checked at human level. FDS 6.5.1 ver. was used to predict the various parameters of temperature, and visibility and Co concentration. Eight cases were conducted; Cases 1, 2, 3 and 7 were done to compare between four different ventilation systems at 30 MW. Case 4, 5, 6 and 8 were done to compare between three different ventilation systems at 100 MW