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FVM-RANS Modeling of Air Pollutants Dispersion and Traffic Emission in Dhaka City on a Suburb Scale

Ali, Md. Eabad ; Hasan, Md Farhad ; Siddiqa, Sadia ; Molla, Md. Mamun ; Nasrin Akhter, Most

Sustainability, 2023-01, Vol.15 (1), p.673 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
FVM-RANS Modeling of Air Pollutants Dispersion and Traffic Emission in Dhaka City on a Suburb Scale
Autor: Ali, Md. Eabad ; Hasan, Md Farhad ; Siddiqa, Sadia ; Molla, Md. Mamun ; Nasrin Akhter, Most
Assuntos: Air monitoring ; Air pollution ; Air quality ; Air quality management ; Buildings ; Carbon monoxide ; Case studies ; Construction ; COVID-19 ; Dispersion ; Emission analysis ; Environmental aspects ; Exposure ; Finite volume method ; Fluid dynamics ; Fluid flow ; High rise buildings ; Indoor air quality ; Inhabitants ; Outdoor air quality ; Pollutants ; Pollution dispersion ; Public safety ; Reynolds averaged Navier-Stokes method ; Street canyons ; Streets ; Suburban areas ; Suburbs ; Traffic ; Transportation industry ; Turbulence models ; Urbanization ; Vehicle emissions ; Velocity ; Wind ; Wind direction ; Wind effects ; Wind speed
É parte de: Sustainability, 2023-01, Vol.15 (1), p.673
Descrição: The present study aims to investigate the impact of air pollutants dispersion from traffic emission under the influence of wind velocity and direction considering the seasonal cycle in two major areas of Dhaka city: namely, Tejgaon and Gazipur. Carbon monoxide (CO) mass fraction has been considered as a representative element of traffic-exhausted pollutants, and the distribution of pollutants has been investigated in five different street geometries: namely, single regular and irregular, double regular and irregular, and finally, multiple irregular streets. After the grid independence test confirmation as well as numerical validation, a series of case studies has been presented to analyze the air pollutants dispersion, which mostly exists due to the traffic emission. The popular Reynolds-averaged Navier–Stokes (RANS) approach has been considered, and the finite volume method (FVM) has been applied by ANSYS FluentTM. The k−ϵ turbulence model has been integrated from the RANS approach. It was found that the wind velocity as well as wind direction and the fluid flow fields can play a potential role on pollution dispersion in the Dhaka city street canyons and suburbs. Inhabitants residing near the single regular streets are exposed to more traffic emission than those of single irregular streets due to fewer obstacles being created by the buildings. Double regular streets have been found to be a better solution to disperse pollutants, but city dwellers in the east region of double irregular streets are exposed to a greater concentration of pollutants due to the change of wind directions and seasonal cycles. Multiple irregular streets limit the mobility of the pollutants due to the increased number of buildings, yet the inhabitants near the multi-irregular streets are likely to experience approximately 11.25% more pollutants than other dwellers living far from the main street. The key findings of this study will provide insights on improving the urbanization plan where different geometries of streets are present and city dwellers could have less exposure to traffic-exhausted pollutants. The case studies will also provide a template layout to map pollutant exposure to identify the alarming zone and stop incessant building construction within those regions by creating real-time air quality monitoring to safeguard public safety.
Editor: Basel: MDPI AG
Idioma: Inglês

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FVM-RANS Modeling of Air Pollutants Dispersion and Traffic Emission in Dhaka City on a Suburb Scale

Ali, Md. Eabad ; Hasan, Md Farhad ; Siddiqa, Sadia ; Molla, Md. Mamun ; Nasrin Akhter, Most

Basel: MDPI AG

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