3D Simulation of a fire inside a river tunnel and optimisation of the ventilation using Computational Fluid Dynamics
نویسندگان
چکیده
CFD simulation is used to predict 3D flow inside different configurations. Tunnel ventilation system is one example of CFD application field. Ventilation system is important in all kind of tunnels, road tunnel, rail tunnel or waterway tunnel. In all case CFD is able to predict chronic pollutant dispersion or accidental consequences. This paper presents the model of a waterway tunnel in France in which the ventilation system is particularly complex, performed by the CFD software, fluidyn-VENTUNNEL. A first simulation deals with sanitary ventilation in the course of a typical scenario of 3 passenger boats in the tunnel. The second part of the paper presents the emergency ventilation scenario in case of an accidental fire on one of the boats. In that case, as soon as the detection (based on CO levels) has occurred, a PUSH/PULL system is simulated to prevent from inrush of smoke in the tunnel. Although all parameters have been chosen in order to be as penalizing as possible, results show that ventilation system is correctly dimensioned. This example case will demonstrate the interest of CFD in tunnel ventilation characterization.
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