Investigation of the Effect of Urban Street Canyon Materials on Microclimate by CFD in Shiraz

Document Type : Original Article

Authors

1 PhD Candidate, Faculty of Civil Engineering, Art and Architecture, Science and Research Branch, Islamic Azad University, Tehran, Iran.

2 Assistant Professor, Head of Urban Development Department, Iran University of Science and Technology, Tehran, Iran.

3 Assistant Professor, Faculty of Civil Engineering, Art and Architecture, Science and Research Branch, Islamic Azad University, Tehran, Iran

4 Associate Professor, Faculty of Civil Engineering, Art and Architecture, Science and Research Branch, Islamic Azad University, Tehran, Iran.

10.48301/kssa.2023.354640.2225

Abstract

Given the rapid acceleration of urbanization in the city of Shiraz in recent years, it seems necessary to study the impact of new developments. The purpose of this study was to investigate the effects of urban canyon material on daily average temperature and net long-wave wall flux. Therefore, the question arises of how urban surface material affects average daily temperatures and wall long-wave net fluxes. In this study, ANSYS FLUENT software was used to numerically model airflow, heat transfer, and solar radiation in a three-dimensional urban environment. The k-ε turbulence model was implemented for the initial modeling, whereas the large-eddy simulation model was utilized for the final modeling. The simulation also used three different materials for the urban facade; aluminum, gray concrete, and white stone, and asphalt for the ground. It was observed that the lowest wall’s mean temperature was related to the white stone with a temperature of 294K at approximately 5:00 AM and the highest value was associated with the aluminum material with a temperature of 337K at approximately 14:00 PM. The lowest value of the average net long-wave radiation flux of walls equal to 53 w/m2 was related to the aluminum material at approximately 6:30 AM and the highest amount equivalent to 295 w/m2 was related to the white stone material at 15 PM. Comparisons revealed that the magnitude of the vortices generated next to the building was approximately the same for the three materials and the formation of vortices behind buildings that were as tall as the buildings.

Keywords

Main Subjects

References

[1] Bakarman, M. A., & Chang, J. D. (2015). The Influence of Height/width Ratio on Urban Heat Island in Hot-arid Climates. Procedia Engineering, 118, 101-108. https://doi.o rg/10.1016/j.proeng.2015.08.408
[2] Nazarian, N., & Kleissl, J. (2016). Realistic solar heating in urban areas: Air exchange and street-canyon ventilation. Building and Environment, 95(2), 75-93. https://doi.org/10.10 16/j.buildenv.2015.08.021
[3] Yaghoobian, N., & Kleissl, J. (2012). Effect of reflective pavements on building energy use. Urban Climate, 2, 25-42. https://doi.org/10.1016/j.uclim.2012.09.002
[4] Blunn, L. P., Coceal, O., Nazarian, N., Barlow, J. F., Plant, R. S., Bohnenstengel, S. I., & Lean, H. W. (2022). Turbulence Characteristics Across a Range of Idealized Urban Canopy Geometries. Boundary-Layer Meteorology, 182(2), 275-307. https://doi.org /10.1007/s10546-021-00658-6
[5] Stewart, I. D., & Oke, T. R. (2012). Local climate zones for urban temperature studies. Bulletin of the American Meteorological Society, 93(12), 1879-1900. https://doi.org/10.1175/BA MS-D-11-00019.1
[6] Huang, K., Li, X., Liu, X., & Seto, K. C. (2019). Projecting global urban land expansion and heat island intensification through 2050. Environmental Research Letters, 14(11), 1-12. https://doi.org/10.1088/1748-9326/ab4b71
[7] Mughal, M. O., Kubilay, A., Fatichi, S., Meili, N., Carmeliet, J., Edwards, P., & Burlando, P. (2021). Detailed investigation of vegetation effects on microclimate by means of computational fluid dynamics (CFD) in a tropical urban environment. Urban Climate, 39, 100939. https://doi.org/10.1016/j.uclim.2021.100939
[8] Oke, T. R. (2002). Boundary layer climates (2 ed.). Routledge. https://www.routledge.com/Bo undary-Layer-Climates/Oke/p/book/9780415043199
[9] Asimakopoulos, D. N., Assimakopoulos, V. D., Chrisomallidou, N., Klitsikas, N., Mangold, D., Michel, P., Santamouris, M., & Tsangrassoulis, A. (2001). Energy and climate in the urban built environment (M. Santamouris, Ed.). James & James. https://doi.org/10.4324 /9781315073774
[10] Allegrini, J., Dorer, V., & Carmeliet, J. (2015). Coupled CFD, radiation and building energy model for studying heat fluxes in an urban environment with generic building configurations. Sustainable Cities and Society, 19, 385-394. https://doi.org/10.1016/ j.scs.2015.07.009
[11] Watkins, R., Palmer, J., Kolokotroni, M., & Littlefair, P. (2002). The London Heat Island: results from summertime monitoring. Building Services Engineering Research and Technology, 23(2), 97-106. https://doi.org/10.1191/0143624402bt031oa
[12] Erell, E., Pearlmutter, D., & Williamson, T. (2011). Urban microclimate: designing the spaces between buildings. Routledge. https://www.routledge.com/Urban-Microclimate-Designing-the-Spaces-Between-Buildings/Erell-Pearlmutter-Williamson/p/book/9781 138993983
[13] Fischer, E. M., & Schar, C. (2009). Future changes in daily summer temperature variability: driving processes and role for temperature extremes. Climate Dynamics, 33(7), 917-935. https://doi.org/10.1007/s00382-008-0473-8
[14] Mei, S-J., Luo, Z., Zhao, F-Y., & Wang, H-Q. (2019). Street canyon ventilation and airborne pollutant dispersion: 2-D versus 3-D CFD simulations. Sustainable Cities and Society, 50(2), 101700. https://doi.org/10.1016/j.scs.2019.101700
[15] Fu, X., Liu, J., Ban-Weiss, G. A., Zhang, J., Huang, X., Ouyang, B., Popoola, O., & Tao, S. (2017). Effects of canyon geometry on the distribution of traffic-related air pollution in a large urban area: Implications of a multi-canyon air pollution dispersion model. Atmospheric Environment, 165, 111-121. https://doi.org/10.1016/j.atmosenv.2017.06.0 31
[16] Zhong, J., Cai, X-M., & Bloss, W. J. (2016). Coupling dynamics and chemistry in the air pollution modelling of street canyons: A review. Environmental Pollution, 214, 690-704. https://doi.org/10.1016/j.envpol.2016.04.052
[17] Firdausah, A., & Wonorahardjo, S. (2017, November 11). Typology study of urban canyon in residential area and the quality of its thermal environment. HABITechno 3 International Conference, Bandung, Indonesia. https://doi.org/10.1088/1755-1315 /152/1/012025
[18] Mohajerani, A., Bakaric, J., & Jeffrey-Bailey, T. (2017). The urban heat island effect, its causes, and mitigation, with reference to the thermal properties of asphalt concrete. Journal of Environmental Management, 197, 522-538. https://doi.org/10.1016/j.jenvman.2017.03. 095
[19] Radhi, H., Assem, E., & Sharples, S. (2014). On the colours and properties of building surface materials to mitigate urban heat islands in highly productive solar regions. Building and Environment, 72, 162-172. https://doi.org/10.1016/j.buildenv.2013.11.005
[20] Heydari, E., Mehdinezhad, J., & Doulabi, P. (2022). Strategic Principles of Designing the form of a Residential Building in Bushehr Based on Reducing Energy Consumption. Karafan Quarterly Scientific Journal, 18(4), 345-361. https://doi.org/10.48301/kssa.202 2.306864.1761
[21] Shayanian, A., Mozaffari Qhadikolaei, F., & Pahlavan, A. (2022). The Effect of Materials in Reducing Energy Consumption in Atrium Commercial Centers in the North and Center of Tehran Province. Karafan Quarterly Scientific Journal, 18(4), 429-440. https://doi.or g/10.48301/kssa.2021.281281.1482
[22] Li, L., Yang, L., Zhang, L-J., & Jiang, Y. (2012). Numerical study on the impact of ground heating and ambient wind speed on flow fields in street canyons. Advances in Atmospheric Sciences, 29(6), 1227-1237. https://doi.org/10.1007/s00376-012-1066-3
[23] Xie, X., Liu, C-H., Leung, D. Y. C., & Leung, M. K. H. (2006). Characteristics of air exchange in a street canyon with ground heating. Atmospheric Environment, 40(33), 6396-6409. https://doi.org/10.1016/j.atmosenv.2006.05.050
[24] Uehara, K., Murakami, S., Oikawa, S., & Wakamatsu, S. (2000). Wind tunnel experiments on how thermal stratification affects flow in and above urban street canyons. Atmospheric Environment, 34(10), 1553-1562. https://doi.org/10.1016/S1352-2310(99)00410-0
[25] Offerle, B., Eliasson, I., Grimmond, C. S. B., & Holmer, B. (2007). Surface heating in relation to air temperature, wind and turbulence in an urban street canyon. Boundary-Layer Meteorology, 122(2), 273-292. https://doi.org/10.1007/s10546-006-9099-8
[26] Middel, A., Häb, K., Brazel, A. J., Martin, C. A., & Guhathakurta, S. (2014). Impact of urban form and design on mid-afternoon microclimate in Phoenix Local Climate Zones. Landscape and Urban Planning, 122(1), 16-28. https://doi.org/10.1016/j.landurbplan.2 013.11.004
[27] Toparlar, Y., Blocken, B., Maiheu, B., & Van Heijst, G. J. F. (2017). A review on the CFD analysis of urban microclimate. Renewable and Sustainable Energy Reviews, 80, 1613-1640. https://doi.org/10.1016/j.rser.2017.05.248
Karafan Quarterly Scientific Journal
Volume 19, Issue 4 - Serial Number 60
Art and Architecture | Agriculture
March 2023
Pages 261-277

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History

  • Receive Date: 23 August 2022
  • Revise Date: 17 December 2022
  • Accept Date: 30 January 2023

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