FLOW BEHAVIOR ANALYSIS FOR THE VENTILATED FLOW UNDER EMERGENCY IN SUBWAY STATION

초록

Flow behavior analysis and visualization is performed for the ventilated flow in case of fire emergency in deeply underground subway station. Shin-gum-ho station, (The line #5, Seoul) its depth is 46m, has been selected as an experimental and simulation study for the investigation of ventilated and fire-driven flow. Currently, ventilation-operation mode in Shin-gum-ho station is set up as a full exhaustion in the platform and a full supply in the lobby in case of platform-fire emergency. The entire station is covered for simulation. Ventilation diffusers are modeled as the 222 square shapes of 0.6m(x) ⅹ 0.6m(y) and the 4 rectangular shapes of 1.2m(x)ⅹ0.8m(y) in the platform and as the 95 square shapes of 0.6m(x) ⅹ 0.6m(y) in the lobby. The total of 7.5 million grids are generated and the whole domain is divided to 22 blocks for the efficiency of calculation. The parallel processing is employed using MPI. The momentum equations and heat equations are solved by Large Eddy Simulation (LES). The simulated results are well compared with experimental data.