Incorporating convective feedback in wildfire simulations using pyrogenic potential

Modelling the dynamics of wildfires is very computationally challenging. Although three-dimensional computational fluid dynamics (CFD) models have been successfully applied to wildfires, the computational time required makes them currently impractical for operational usage. In this study, we develop...

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Bibliographic Details
Published in:Environmental modelling & software : with environment data news 2018-09, Vol.107, p.12-24
Main Authors: Hilton, J.E., Sullivan, A.L., Swedosh, W., Sharples, J., Thomas, C.
Format: Article
Language:English
Subjects:
Aerodynamics
Computational fluid dynamics
Computer applications
Computer simulation
Computing time
Fire behaviour
Fire spread
Fluid dynamics
Forest & brush fires
Hydrodynamics
Inflow
Laboratory experiments
Mathematical models
Parabolas
Potential flow
Predictions
Propagation
Simulation
Three dimensional models
Two dimensional models
Wildfire modelling
Wildfires
Wildland fire
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Summary:Modelling the dynamics of wildfires is very computationally challenging. Although three-dimensional computational fluid dynamics (CFD) models have been successfully applied to wildfires, the computational time required makes them currently impractical for operational usage. In this study, we develop a two-dimensional propagation model coupled to a ‘pyrogenic’ potential flow formulation representing the inflow of air generated by the fire. This model can accurately replicate features of fires previously unable to be simulated using current two-dimensional models, including development of a fire line into a parabolic shape, attraction between nearby fires and the observed closing behaviour of ‘V’ shaped fires. The model is compared to experimental results with good agreement. The pyrogenic potential model is orders of magnitude faster than a full CFD model, and could be used for improved operational wildfire prediction. •Development of a coupled ‘pyrogenic’ model for fire propagation with inflowing air generated by the fire.•Very good fit between a generalised rate-of-spread model utilising pyrogenic feedback and small-scale experimental fires.•Two-dimensional formulation runs at a fraction of the cost of a full three-dimensional model.
ISSN:1364-8152
1873-6726
DOI:10.1016/j.envsoft.2018.05.009