Numerical studies on density jump in a long corridor fire

Aerodynamics simulation on density jump in a long corridor fire

“…4d that density jump occurred. Vortices for CFD simulations from Qu and Chow (2012) as in Fig. 2c did not appear.…”

“…Therefore, two-dimensional simulations were carried out first. According to the description by Regev et al (2004), and referring to the model used by Qu and Chow (2012), the long corridor was of length 20 m and height 9 m with the computing domain extended out to better describe the free boundary, and with a hot smoke jet inflow and two ends open. The smoke barrier height was 0.5 m. In this set of scenarios, a hot smoke jet with velocity V in of 5 m/s and depth D 1 of 0.1 m and temperature 300°C is flowing from the smoke jet inflow, as shown in Fig.…”

“…Poreh et al (2008) showed that a density jump might occur after striking the smoke barrier of certain height with two-dimensional experimental study. The characteristics of the density jump along a long corridor were preliminarily simulated earlier by Qu and Chow (2012) using the Computational Fluid Dynamics (CFD) software -Fire Dynamics Simulator (FDS) version 5. Predicted results showed that density jumps in a long corridor would increase the air entrainment rate, and theoretical analysis (Regev et al, 2004) may not be applicable in three-dimensional corridor case.…”

“…2c. Qu and Chow (2012) considered that the grid system was too dense to the unreasonable velocity profile. For FDS based on linear grid to solve equations, a rectangular region should be constructed to accommodate the physical background of the grid.…”

Studies on Smoke Temperature Distribution in a Building Corridor Based on Reduced-scale Experiments

“…Thus, the accuracy is limited under many circumstances. Although there are many problems in using computational fluid dynamics CFD, it can be applied to predict macroscopic flow parameters (Qu and Chow, 2012). By using CFD, research has been conducted on the density jump (Qu and Chow, 2012), smoke control (Weng et al, 2014), critical ventilation velocity (Hwang and Edwards, 2015), stack effects on natural ventilation (Ji et al, 2013), and slope influence (Ballesteros-Tajadura et al, 2006) in a tunnel fire.…”