Navier-Stokes equations are solved to simulate a gymnasium fire. The equations are simpli- fied by weakly compressible low Mach number as- sumption. Turbulence effect is simulated using Smagorinsky large eddy simulati...Navier-Stokes equations are solved to simulate a gymnasium fire. The equations are simpli- fied by weakly compressible low Mach number as- sumption. Turbulence effect is simulated using Smagorinsky large eddy simulation (LES) model. The mixture fraction combustion model is adopted to simulate the burning process. With the analysis of computed velocity and temperature field, two impor- tant phenomena, named door effect and smoke plug-holing, are found to be responsible for the dete- rioration of smoke exhaust efficiency when natural ventilation or forced ventilation is present. Some ex- planations are made to elucidate these effects’ mechanism. An improved design of smoke ventilation system is suggested.展开更多
文摘Navier-Stokes equations are solved to simulate a gymnasium fire. The equations are simpli- fied by weakly compressible low Mach number as- sumption. Turbulence effect is simulated using Smagorinsky large eddy simulation (LES) model. The mixture fraction combustion model is adopted to simulate the burning process. With the analysis of computed velocity and temperature field, two impor- tant phenomena, named door effect and smoke plug-holing, are found to be responsible for the dete- rioration of smoke exhaust efficiency when natural ventilation or forced ventilation is present. Some ex- planations are made to elucidate these effects’ mechanism. An improved design of smoke ventilation system is suggested.
