Faculty Publications
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Item Impact of Building Configurations on Fluid Flow in an Urban Street Canyon(Springer Science and Business Media Deutschland GmbH, 2024) Singh, S.; Singh, L.; Jitendra Pal, S.The problem of pollution dispersion in urban areas is significant in the densely populated cities. The topography and barriers in the form of buildings impact the atmospheric fluid flow. The resulting phenomena known as pollution traps cause an artificial dispersion in the buildings’ proximity, affecting the health of ordinary road commuters. The primary source of pollution on the street canyons is exhaust gases from the vehicle movements. However, the concern is associated with the poor dispersion of pollutants under normal wind conditions. The primary reason behind the poor dispersion is the buildings that act as obstacles to the atmospheric wind flow. Thereby it is essential to comprehend the behaviour of pollutants under given shape constraints and flow conditions to improve urban air quality. The present study investigates the wind flow in the proximity of a six-storey building for a medium street canyon configuration under the logarithm inlet velocity profile that acts as atmospheric boundary layer (ABL). Effect of important parameters such as the building height, the wind direction (0, 30, 45, 60, and 90°), and building configurations (straight road, both side building, and only upwind side building with downwind side building) are investigated to gain valuable insights into pollutant dispersion. The analysis of turbulence and velocity profile in the domain at nose level (1.5 m above ground level) leeward sidewalk and windward sidewalk shows turbulent intensity decreases at the nose (breathing) level with building height; however, it increases when the approach angle is 450 suggesting the formation of dominant pockets of pollutants. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.Item Dispersion in an Urban Cross-Street Intersection(Springer Science and Business Media Deutschland GmbH, 2025) Ranadive, S.; Singh, L.; Jitendra Pal, S.A typical urban street intersection comprises of roadways, pedestrian walkways, and tall buildings on the sides. Due to the large number of vehicles plying on the urban streets, the pedestrians are exposed to vehicular pollution. With the increase in the density of automobiles, there is a bigger threat to pedestrians. The current study investigates pollution dispersion in the case of an eight-story building across a cross-street intersection. The study includes the effect of the aspect ratio (AR = 0.5, AR = 1, and AR = 2), a ratio of building height to road width, on flow patterns and dispersion. The second part of the work includes the effect of wind approach angle (0º, 30º, 45º, 60º) on the dispersion. It is found that the pollutant mass concentration at the nose level of pedestrians is strongly influenced by the aspect ratio wherein the taller building provides less exposure to pedestrians due to the lateral dispersion. The wind approach angle also affects the pollutant concentration at the nose level. The exposure to pollutant is skewed along the length of the road walkways in the case of 30º and 60º. However, the dispersion in more uniform in the case when wind approach angle is 45º. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.