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Modélisation du couplage incendie-ventilation en tunnel par une approche 3D

Abstract : This paper presents one part of the EGSISTES research project. This project is linked with the recent accidents that occurred in some tunnels. More especially, one of the aims of this project is to define the answer of a stratified smoke layer to an external disturbance such as fan or vehicle presence. This will be done using both experimental and numerical approaches. The objective of this paper is to describe the relations between fire and ventilation modelling which is the key point for the stratification understanding. One of the main phenomena responsible of the stratification disturbance is turbulence with can be modelled following three main approaches: RANS, LES and DNS. Those three approaches are described in the paper. LES simulations are presented next because the FDS code used by INERIS is based on this approach. This approach is the best compromise between the instationnary phenomena modelling and the computing possibilities. The basic principles of ventilation in road tunnels are described next: transversal and longitudinal ventilation strategy. Both approaches have to be applied following a strict regulation in France. The first consists in blowing smoke outside the tunnel using one part of this tunnel the second one required a ventilation duct for smokes extraction. Finally, FDS computations reproduce experiments that are achieved in the INERIS fire tunnel with a one third scale. Those experiments aim first to have a better characterisation of the stratified smoke layer.
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Submitted on : Thursday, September 6, 2018 - 12:34:54 PM
Last modification on : Friday, September 7, 2018 - 1:11:30 AM
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  • HAL Id : ineris-01869203, version 1



Benjamin Truchot. Modélisation du couplage incendie-ventilation en tunnel par une approche 3D. Rapport Scientifique INERIS, 2008, 2007-2008, pp.76-79. ⟨ineris-01869203⟩



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