LES Simulation of Wind-Driven Wildfire Interaction with Idealized Structures in the Wildland-Urban Interface

Atmosphere

Maryam Ghodrat¹  Mohsen Ghaderi²  JasonJ. Sharples³ 

[1] School of Engineering and Information Technology, UNSW Canberra, Canberra, ACT 2612, Australia;School of Mechanical Engineering, University of Tehran, Tehran 14395-515, Iran;School of Science, UNSW Canberra, Canberra, ACT 2612, Australia;

关键词: bushfire;    wildfire;    wind-driven fire;    wildland–urban interface;    LES;    FireFOAM;   

DOI  :  10.3390/atmos12010021

来源: DOAJ

【 摘 要 】

This paper presents a numerical investigation of the impact of a wind-driven surface fire, comparable to a large wildfire, on an obstacle located downstream of the fire source. The numerical modelling was conducted using FireFOAM, a coupled fire–atmosphere model underpinned by a large eddy simulation (LES) solver, which is based on the Eddy Dissipation Concept (EDC) combustion model and implemented in the OpenFOAM platform (an open source CFD tool). The numerical data were validated using the aerodynamic measurements of a full-scale building model in the absence of fire effects. The results highlighted the physical phenomena contributing to the fire spread pattern and its thermal impact on the building. In addition, frequency analysis of the surface temperature fluctuations ahead of the fire front showed that the presence of a building influences the growth and formation of buoyant instabilities, which directly affect the behaviour of the fire’s plume. The coupled fire-atmosphere modelling presented here constitutes a fundamental step towards better understanding the behaviour and potential impacts of large wind-driven wildland fires in wildland–urban interface (WUI) areas.

【 授权许可】

Unknown