Computational and Experimental Study of Effects of Some Parameters on the Ventilation System of Zand Tunnel of Shiraz

Three-dimensional flow and dispersion of gas pollutant carbon monoxide in a two-way underground tunnel in the center of Shiraz in Iran was modeled using standard k-􀄰 turbulence model, which was numerically solved by the commercial CFD code FLUENT. The results indicate a good agreement between the experimental data and the model. The effects of some parameters including the existence, operation, position and layout of inlet and outlet fans, wind velocity, protruding cement beams on the walls and roof upon the distribution of CO concentration inside the tunnel were numerically investigated using a computational fluid dynamics (CFD) model. The results show that the location and direction of inlet and outlet fans have a significant effect on the distribution of CO concentration where as the direction and wind velocity don't have any effect on that due to structure and location of the tunnel.