@article {bnh-8375, title = {Physics-based simulations of grassfire propagation on sloped terrain at field scale: motivations, model reliability, rate of spread and fire intensity}, journal = {International Journal of Wildland Fire}, year = {2023}, month = {01/2023}, abstract = {

This study focuses on physics-based modelling of grassfire behaviour over flat and sloped terrains through a set of field-scale simulations performed using the Wildland{\textendash}urban Interface Fire Dynamics Simulator (WFDS), with varying wind speeds (12.5, 6 and 3 m s-1) and slope angles (-30{\textdegree} to +30{\textdegree}). To ensure the accuracy of this Large Eddy Simulation (LES), a sensitivity study was carried out to select the converged domain and grid sizes. Fire isochrones, locations of fire front, dynamic and quasi-steady rates of spread (RoS), and fire intensity results from the simulations are presented. Within the simulations conducted, the RoS and fire intensity were found to be higher with increasing slope angles, as well as with wind velocity. RoS comparisons are made with various empirical models. At different slope angles and driving wind velocities, different empirical quasi-steady RoS broadly match with particular dynamic maximum, minimum and averaged RoS values from this study. It appears that the ideal nature of grassfire propagation simulation and challenges related to measuring quasi-steady values in experimental studies are likely reasons for the observed differences. Additionally, for lower wind velocities, the RoS{\textendash}fire intensity relationship (Byram{\textquoteright}s) deviates from linearity for greater upslopes.

}, keywords = {Fire behaviour, fire front, grass fire, intensity, rate of spread (RoS) of fire, simulations, slope, wind speed}, doi = {https://doi.org/10.1071/WF21124}, url = {https://www.publish.csiro.au/wf/WF21124}, author = {Jasmine Innocent and Duncan Sutherland and Nazmul Khan and Khalid Moinuddin} } @article {bnh-7838, title = {A response to comments of Cruz et al. on: {\textquoteleft}Simulation study of grass fire using a physics-based model: striving towards numerical rigour and the effect of grass height on the rate of spread{\textquoteright}}, journal = {International Journal of Wildland Fire}, year = {2021}, month = {02/2021}, abstract = {

In response to Cruzet al.(2020b) (hereafter: CSG20), we would like to clarify that we are committed to further research into the mechanisms that drive fire spread in grassland fuels, and are open to making the most of synergies that exist between various programs of research. As demonstrated by Filippiet al.(2013), Kochanskiet al.(2013), Clementset al.(2019), etc., there is much to be gained by combining detailed experimental data with rigorous computational modelling.

}, keywords = {Byram number, fuel height, grass fire, modes of fire propagation, rate of spread.}, doi = {https://doi.org/10.1071/WF20091}, url = {https://www.publish.csiro.au/WF/WF20091}, author = {Duncan Sutherland and Jason J. Sharples and William Mell and Khalid Moinuddin} }