Modeling longitudinal ventilation in tunnels using fire dynamics simulator

被引：8
作者：
McGrattan, Kevin [1 ]
Bilson, Matthew [2 ]
机构：
[1] NIST, Gaithersburg, MD 20899 USA
[2] WSP, Sydney, Australia
来源：
FIRE SAFETY JOURNAL | 2023年 / 141卷
关键词：
Back-layering; CFD; Modeling; Smoke management; Tunnel fires; SMOKE FLOW;
D O I：
10.1016/j.firesaf.2023.103982
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This paper discusses modeling tunnel fires using the computational fluid dynamics model Fire Dynamics Simulator (FDS). The model assumes that the speed of sound is infinite which leads to challenges related to solving the equation for pressure. The problem is particularly acute when multiple meshes are used to solve the governing equations in parallel. A method is presented in which the 3-D Poisson equation for the pressure, which is solved on each mesh, is approximated by a 1-D equation over the entire length of the tunnel. The 1-D solution serves as a preconditioner for the 3-D solver. This method is tested by comparing the model to three sets of experiments, one small-scale, one reduced-scale, and one full-scale. For each set of experiments, the intent is to predict the extent of the smoke back-layering.
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页数：10
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