Investigation of terrain slope effects on wind enhancement by a line source fire
Wind enhancement triggered by fire-wind interaction can potentially pose significant damage to structures built in bushfire prone areas. The effect of terrain slope is one of the parameters contributing to the enhancement of wind by fire that needs to be taken into account. This study employs a vali...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2019-09-01
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| Series: | Case Studies in Thermal Engineering |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X19301121 |
| _version_ | 1828425881380454400 |
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| author | E. Eftekharian M. Ghodrat Y. He R.H. Ong K.C.S. Kwok M. Zhao B. Samali |
| author_facet | E. Eftekharian M. Ghodrat Y. He R.H. Ong K.C.S. Kwok M. Zhao B. Samali |
| author_sort | E. Eftekharian |
| collection | DOAJ |
| description | Wind enhancement triggered by fire-wind interaction can potentially pose significant damage to structures built in bushfire prone areas. The effect of terrain slope is one of the parameters contributing to the enhancement of wind by fire that needs to be taken into account. This study employs a validated model of Computational Fluid Dynamics to assess the effects of terrain slope on this phenomenon. A module was developed and appended to the FireFOAM solver to output individual component of flow acceleration. Multiple analyses were used to explain the effects of terrain upslope and downslope on the phenomenon. The results reveal that although the enhancement of wind velocity due to fire increases with an increase in terrain upslope, a terrain downslope reduces flow enhancement by fire. The results also established that while an upslope terrain reinforces the Coanda effects and intensifies attachment of the plume to the ground, the downslope condition mitigates Coanda effects and reduces the flow's tendency to attach to the ground downstream of the fire source. Furthermore, under a constant heat release rate and upstream wind velocity, the maximum magnitude of wind enhancement linearly increases with the increase of upslope angle. Keywords: Upslope, Downslope, Wind enhancement, Fire, CFD, Coanda effects |
| first_indexed | 2024-12-10T16:38:29Z |
| format | Article |
| id | doaj.art-82b95e1d52704874b00ee67c3315c33c |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-10T16:38:29Z |
| publishDate | 2019-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-82b95e1d52704874b00ee67c3315c33c2022-12-22T01:41:19ZengElsevierCase Studies in Thermal Engineering2214-157X2019-09-0114Investigation of terrain slope effects on wind enhancement by a line source fireE. Eftekharian0M. Ghodrat1Y. He2R.H. Ong3K.C.S. Kwok4M. Zhao5B. Samali6Center for Infrastructure Engineering, School of Computing Engineering and Mathematics, Western Sydney University, Penrith, NSW, 2751, Australia; Corresponding author.Center for Infrastructure Engineering, School of Computing Engineering and Mathematics, Western Sydney University, Penrith, NSW, 2751, AustraliaCenter for Infrastructure Engineering, School of Computing Engineering and Mathematics, Western Sydney University, Penrith, NSW, 2751, AustraliaSchool of Civil Engineering, The University of Sydney, NSW, AustraliaSchool of Civil Engineering, The University of Sydney, NSW, AustraliaCenter for Infrastructure Engineering, School of Computing Engineering and Mathematics, Western Sydney University, Penrith, NSW, 2751, AustraliaCenter for Infrastructure Engineering, School of Computing Engineering and Mathematics, Western Sydney University, Penrith, NSW, 2751, AustraliaWind enhancement triggered by fire-wind interaction can potentially pose significant damage to structures built in bushfire prone areas. The effect of terrain slope is one of the parameters contributing to the enhancement of wind by fire that needs to be taken into account. This study employs a validated model of Computational Fluid Dynamics to assess the effects of terrain slope on this phenomenon. A module was developed and appended to the FireFOAM solver to output individual component of flow acceleration. Multiple analyses were used to explain the effects of terrain upslope and downslope on the phenomenon. The results reveal that although the enhancement of wind velocity due to fire increases with an increase in terrain upslope, a terrain downslope reduces flow enhancement by fire. The results also established that while an upslope terrain reinforces the Coanda effects and intensifies attachment of the plume to the ground, the downslope condition mitigates Coanda effects and reduces the flow's tendency to attach to the ground downstream of the fire source. Furthermore, under a constant heat release rate and upstream wind velocity, the maximum magnitude of wind enhancement linearly increases with the increase of upslope angle. Keywords: Upslope, Downslope, Wind enhancement, Fire, CFD, Coanda effectshttp://www.sciencedirect.com/science/article/pii/S2214157X19301121 |
| spellingShingle | E. Eftekharian M. Ghodrat Y. He R.H. Ong K.C.S. Kwok M. Zhao B. Samali Investigation of terrain slope effects on wind enhancement by a line source fire Case Studies in Thermal Engineering |
| title | Investigation of terrain slope effects on wind enhancement by a line source fire |
| title_full | Investigation of terrain slope effects on wind enhancement by a line source fire |
| title_fullStr | Investigation of terrain slope effects on wind enhancement by a line source fire |
| title_full_unstemmed | Investigation of terrain slope effects on wind enhancement by a line source fire |
| title_short | Investigation of terrain slope effects on wind enhancement by a line source fire |
| title_sort | investigation of terrain slope effects on wind enhancement by a line source fire |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X19301121 |
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