OpenFOAM을 이용한 축소 구획실의 백드래프트 현상에 대한 대와동모사

Large Eddy Simulation of the Backdraft Phenomenon in a Reduced-Scale Compartment Using OpenFOAM

Backdraft is a hazardous fire phenomenon that occurs in an under-ventilated enclosure fires. Backdraft experiments are dangerous and complex to re-produce. In the past, few computational studies were performed by various authors to investigate the backdraft phenomenon and most of the studies were based on the incompressible solver (low-Mach number approximation). However, incompressible solver has the limitation to solve high speed flame propagation which can occur in large-scale backdraft scenario. Hence, a computational study was performed to investigate the backdraft dynamics with the OpenFOAM compressible solver (FireFOAM). This study is based on the reduced-scale backdraft experiments performed by W.G. Weng et al. (2003). The internal dimensions of the compartment and slot opening are 1.20 m × 0.60 m × 0.60 m, and 0.20 m × 0.60 m respectively, and the initial conditions inside the compartment is based on the experiment. Large Eddy Simulation (LES) turbulence approach, Eddy Dissipation Concept (EDC) combustion model and Finite Volume Discrete Ordinate Method (FVDOM) radiation model are implemented for this study to simulate the backdraft phenomenon. Pressure-Implicit with Splitting of Operators (PISO) algorithm is used as solution scheme to solve the Navier-Stokes equations. The OpenFOAM predicted the backdraft development process with reasonable accuracy and the peak pressure predictions showed reasonable agreements with the measured peak pressure.