An engineering CFD model for fire spread on wood cribs for travelling fires
نویسندگان
چکیده
• An engineering CFD model for fire spread on wood cribs is demonstrated. Fire characterised at stick-by-stick level with least 2 × cells. Global matching of heat release rate, spread, burn-away and flame temperatures. Approximate linear regression between different modes incident radiant fluxes. Heat rate more sensitive to than stick burning rate. The temperature heterogeneity due in large open-plan office compartments closely associated behaviour has been historically limited experimental investigations using timber cribs. This study explores the ability Computational Fluid Dynamics (CFD) models, specifically Simulator (FDS), reproduce results full-scale tests involving over continuous fuel-beds. Mesh schemes are studied, a fine mesh crib cells cross-section by default, this being relaxed surrounding regions enhance computational efficiency. simple pyrolysis considers charring phase moisture. In application TRAFIR-Liège LB7 test, calibrated “stick-by-stick” representation shows good agreement interrelated parameters gas temperature, burn-away, set agreements which not demonstrated previous studies. relatively high sensitivities to: combustion, ignition thermal inertia, radiation fraction, per unit area, fuel load density. approximately was found exposures, “travelling” (and decaying) fires fluxes plume, while growing were proportionally higher horizontal surfaces sticks, conditions where these receive pre-heating. trends overall HRR dependent rates variations rates.
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ژورنال
عنوان ژورنال: Advances in Engineering Software
سال: 2022
ISSN: ['1873-5339', '0965-9978']
DOI: https://doi.org/10.1016/j.advengsoft.2022.103213