Fire-Driven Flow Analysis in Subway Station with Considering Main Tunnel Ventilation

초록

Fire-driven flow analysis in the deeply underground subway station has been performed with considering main tunnel ventilation operation. Shin-gum-ho station (line #5, depth : 46m) is selected as a simulation model. The ventilation operation mode in platform of Shin-gum-ho station is set up as a full exhaustion in case of platform fire. In this study, main tunnel ventilation is assumed to operate in a proper way for helping of smoke exhaustion in platform. Ventilation diffusers were modeled as the 222 square shapes of 0.6m(x)ⅹ0.6m(y) and the 4 rectangular shapes of 1.2m(x)ⅹ0.8(m)(y). The whole station was covered for this analysis and total of 7.5 million grids were generated for this simulation. Large Eddy Simulation method was employed to solve the momentum equations. In order to enhance the efficiency of calculation, parallel processing by MPI was used. The distribution of carbon monoxide (CO) was calculated with and without main tunnel ventilation.