1- islamic azad university of yasooj
2- yasouj university ,Aliakbarheidari.iust@gmail.com
2- yasouj university ,
Abstract: (236 Views)
One of the most important factors affecting air pollution in cities is the pollution caused by urban traffic. Therefore, concern about human health against pollutants in the air has become a crisis in the lives of citizens. The effect of the emission of suspended particles caused by traffic on air quality in urban canyons has been investigated in various researches. Meanwhile, the impact of this issue on indoor air quality has been less investigated. On the other hand, the morphology of buildings has a great impact on the distribution pattern of pollutants in an urban context. In recent years, the role of building morphology on the spread of pollution in urban research and environmental design has received less attention. Accordingly, in this research, the role of the morphology of buildings in an urban context on the distribution of pollutants caused by traffic in the building interior is discussed. Therefore, the form of buildings in an urban context is considered as an independent variable and indoor air quality with two sub-variables of air velocity and pollutant concentration as a dependent variable. The research process is carried out in such a way that at first, by using grasshopper software, wasp plugin, and with the help of Aggregation algorithm, 100 form samples were produced, among which 6 main forms, similar to existing building forms in the urban context of district 1 of the Shiraz city was selected. Then, by rotating each of the forms in four directions, a total of 12 cases of urban context were produced. A building in the center of each urban context was selected as the target building and air quality including air velocity and concentration of pollutants was measured inside it. In this research, the cases were simulated using Computational Fluid Dynamics (CFD). Steady 3-dimensional flow was used to simulate the cases using the SST-Kω turbulence model, which was numerically solved based on the Reynolds Averaged Navier-Stokes (RANS) equations. The CFD software used in this research was validated in comparison with wind tunnel tests, which yielded acceptable results. The results showed that the form of the buildings in the context has a significant effect on the air quality (effect of velocity and pollutant concentration) inside the buildings. Also, based on the results of the TOPSIS multi-criteria decision-making method, the best and the worst building form are related to the L-form and the step-shaped form, respectively. The results of this research suggest design solutions for architects and urban designers to improve the ventilation quality of buildings.
Article number: 146
Keywords: Building form, air quality, air pollution, air velocity, Computational Fluid Dynamics (CFD)
Type of Study: Research original/ Regular Article |
Subject:
معماري و شهرسازي
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