Journal
COMBUSTION AND FLAME
Volume 153, Issue 4, Pages 499-509Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2008.01.013
Keywords
fire dynamics; numerical simulation; turbulent buoyant flames; combustion models
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A one-meter diameter-methane fire was simulated to validate a fire dynamics simulation code for large-scale fires. A uniform grid size of 2.5 cm in the entire computational domain is used. Therefore, only large-scale motions of the fire are resolved. The subgrid-scale heat release is modeled using a mixture-fraction-based combustion model. The radiative heat loss is computed using two methods: a fixed radiative fraction method and a finite volume method. The Computed puffing cycle frequency is affected very weakly by the radiation heat loss. The vertical velocity magnitudes without considering radiation beat loss are about 15% higher, particularly at locations farther away from the burner exit. Good agreement between the predictions and the recent data from Tieszen and co-workers at Sandia National Laboratory confirms the feasibility of fire dynamics simulations of relatively large fires. (c) 2008 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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