Abstract
It is necessary to predict the flow of hot gases generated by an emergency fire in a railway tunnel in order to establish a method for evacuation of passengers from the fire. Therefore, it is important to improve the precision of prediction. In this study, the results by three-dimensional large eddy simulation (LES) were compared to the experimental results of fire test in a full scale tunnel to verify the simulation accuracy. We calculated velocity, temperature and concentration of CO_2 by using the general-purpose fluid analysis software (Advance/FrontFlow/red Version 5.1). Calculations were performed under the condition of a compressible fluid and without consideration on radiative heat transfer. It is shown that a heat release rate or the heat transfer coefficient of air and a tunnel wall have a large effect on the behavior of the hot gases, while the thermal conductivity of a tunnel wall has little influence on the result.
