COMPUTATIONAL STUDY OF TUNNEL VENTILATION SYSTEM UNDER FIRE SCENARIOS

Abstract

More road tunnels construct to assist to new routes through mountainous zones, or to escape environmental obstacles. While the frequency of the tunnel accident cases is low, the effect can be dangerous in terms of depletion, destruction to tunnel building and tools, and the impact on the transport economy. Therefore, the risk evaluation is a major way which can be used to optimize the safety of the underground Buildings. Based on experimental works, this thesis applies a computational study on the Memorial Tunnel by using CFD program to demonstrate that rescue workers / fire fighters can safely approach the accident / fires scene from the upstream tunnel zone. CFD is an influential tool that can simulate Fire with three dimension simulation when comparing numerical data with experimental. A grid sensitivity study performs with different element number to optimize the computational resources. The fire steady-state and transient validation forms in the present study. The experimental and numerical results are presented for validation. The Comparison is displayed a good agreement, accuracy and utility of CFD modelling in order to predict the efficiency of LVS. This study demonstrates the possibilities and limitation of the ventilation system during fire emergency in the tunnel tube, Validates a numerical model results with the experimental results to calculate the efficiency of a longitudinal ventilation system (LVS), demonstrates the tunnel area upstream of the fire will stay free of smoke for rescue workers and firefighters, evaluates the smoke movements with using one Jet fan instead of using triple Jet fans, studies the effect of changing Jet fan time response on the smoke movements and inspects the smoke behavior in a sloped tunnel with different angles.