Article: Numerical simulation of pollutant dispersion in an urban street canyon - effects of elevated metro rail track Journal: International Journal of Environmental Technology and Management (IJETM) 2019 Vol.22 No.2/3 pp.101 - 114 Abstract: Urban air pollution is one of the unsettled issues in urban development and planning process. Urban street canyons are one of the main focused areas of investigation due to the heavy emission of the pollutants from vehicles. In the present study, the effects of elevated metro rail track (EMRT) on pollutant dispersion phenomena have been studied using computational fluid dynamics (CFD) technique. As a practical application of a CFD model, k-ε turbulence model was applied for airflow modelling. Species transport model was applied for pollutant dispersion modelling. Geometrical configuration of urban street canyon of aspect ratio 'one', with elevated metro rail track, has been considered. Numerical simulations were carried out for perpendicular wind flow. Pollutant concentrations, at various locations of the street canyon, were largely affected by the introduction of elevated metro rail track. These results were compared with the street canyon without elevated metro rail track. It has been observed that the pollutant concentration increased at lower region and decreased at the upper region of the street canyon. Variations were not uniformly distributed in street canyon volume. Contours and pollutant concentrations have been compared and discussed for different sampled locations in the street canyon. Inderscience Publishers - linking academia, business and industry through research

Title: Numerical simulation of pollutant dispersion in an urban street canyon - effects of elevated metro rail track

Authors: Abhishek Pratap Singh; Pramod Bhatia

Addresses: Department of Mechanical Engineering, The NorthCap University, Gurugram, Sector 23A, 122017 – Haryana, India ' Department of Mechanical Engineering, The NorthCap University, Gurugram, Sector 23A, 122017 – Haryana, India

Abstract: Urban air pollution is one of the unsettled issues in urban development and planning process. Urban street canyons are one of the main focused areas of investigation due to the heavy emission of the pollutants from vehicles. In the present study, the effects of elevated metro rail track (EMRT) on pollutant dispersion phenomena have been studied using computational fluid dynamics (CFD) technique. As a practical application of a CFD model, k-ε turbulence model was applied for airflow modelling. Species transport model was applied for pollutant dispersion modelling. Geometrical configuration of urban street canyon of aspect ratio 'one', with elevated metro rail track, has been considered. Numerical simulations were carried out for perpendicular wind flow. Pollutant concentrations, at various locations of the street canyon, were largely affected by the introduction of elevated metro rail track. These results were compared with the street canyon without elevated metro rail track. It has been observed that the pollutant concentration increased at lower region and decreased at the upper region of the street canyon. Variations were not uniformly distributed in street canyon volume. Contours and pollutant concentrations have been compared and discussed for different sampled locations in the street canyon.

Keywords: pollutant dispersion; air pollution modelling; street canyon; pollutant concentration; elevated rail track.

DOI: 10.1504/IJETM.2019.102198

International Journal of Environmental Technology and Management, 2019 Vol.22 No.2/3, pp.101 - 114

Accepted: 30 May 2019
Published online: 10 Sep 2019 *

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Title: Numerical simulation of pollutant dispersion in an urban street canyon - effects of elevated metro rail track

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