@article{ref1,
title="The role of helicity and fire-atmosphere turbulent energy transport in potential wildfire behaviour",
journal="International journal of wildland fire",
year="2023",
author="Zhang, Jiawei and Katurji, Marwan and Zawar-Reza, Peyman and Strand, Tara and Zhang, Jiawei and Katurji, Marwan and Zawar-Reza, Peyman and Strand, Tara",
volume="32",
number="1",
pages="29-42",
abstract="Background Understanding near-surface fire-atmosphere interactions at turbulence scale is fundamental for predicting fire spread behaviour.Aims This study aims to investigate the fire-atmosphere interaction and the accompanying energy transport processes within the convective boundary layer.<br><br>METHODS Three groups of large eddy simulations representing common ranges of convective boundary layer conditions and fire intensities were used to examine how ambient buoyancy-induced atmospheric turbulence impacts fire region energy transport.Key results In a relatively weak convective boundary layer, the fire-induced buoyancy force could impose substantial changes to the near-surface atmospheric turbulence and cause an anticorrelation of the helicity between the ambient atmosphere and the fire-induced flow. Fire-induced impact became much smaller in a stronger convective environment, with ambient atmospheric flow maintaining coherent structures across the fire heating region. A high-efficiency heat transport zone above the fire line was found in all fire cases. The work also found counter-gradient transport zones of both momentum and heat in fire cases in the weak convective boundary layer group.<br><br>CONCLUSIONS We conclude that fire region energy transport can be affected by convective boundary layer conditions.Implications Ambient atmospheric turbulence can impact fire behaviour through the energy transport process. The counter-gradient transport might also indicate the existence of strong buoyancy-induced mixing processes.<p /> <p>Language: en</p>",
language="en",
issn="1049-8001",
doi="10.1071/WF22101",
url="http://dx.doi.org/10.1071/WF22101"
}