A multidimensional model for simulating vegetation fire spread using a porous media sub-model
✍ Scribed by X. Y. Zhou; J. C. F. Pereira
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 321 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0308-0501
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✦ Synopsis
An unsteady multidimensional model is reported with the objective of studying wild5res. The present work aims to validate the modelling assumptions against reported experiments of a lab-scale line 5re through a vegetation fuel bed. In this model the fuel bed is assumed to be a porous medium with a randomly orientated discrete solid matrix. A set of time dependent equations of mass, momentum, species and energy are obtained for the gas and solid phase. The hydrodynamic turbulence model is based on a k-eddy viscosity model extended to buoyancy e4ects and to 6ow through vegetation. The e4ects of devolatilization of cellulose material, combustion of gas and heat transfer between gas and solid matrix are simulated. The radiative heat transfer equation in the fuel bed is solved using the discrete ordinates method developed for a porous medium. Soot formation and its impact on radiation are accounted for. The solution is performed numerically by a 5nite volume method. This model has been applied for the prediction of 5re spreading through a litter of pine needles. The predicted rates of 5re spread and fuel mass consumption for two cross wind velocities are presented and compared with measurements showing a satisfactory agreement.