Comparative Study on the Tunnel Fire Driven Flow using Numerical Simulation with RANS and LES Method

초록

In this study, comparative analyzing on the tunnel-fire driven flow is performed using numerical simulationwith LES and RANS method. FDS code is employed to calculate turbulent flow for LES and SMARTFIRE code for RANS. C. C. Hwang[1]’s experimental results of scaling tunnel fire are employed to compare with the numerical simulation. The Geometric dimension of tunnel is 5.4m(L) × 0.4m(W) × 0.3m(H). HRR of fire is 3.3kW and ventilation-velocity is 0.33m/s in the scaling tunnel. Applied models to simulation with FDS code are Smagorinsky model for viscosity, Mixture Fraction for combustion and FVM for radiation. Modified k-ε model is applied for turbulence, the Mixture Fraction for combustion and Six-Flux for radiation in SMARTFIRE code. Methane is used as the main fuel of natural gas in the both code. Non-Scattering gas are assumed for radiation transport. The variously dense grid-distributions are studied in the simulation results.