Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons

Gu, Zhaolin; Zhang, Yun Wei; Cheng, Yan; Lee, Shuncheng

doi:10.1016/j.buildenv.2011.06.028

Cited by 160 publications

(62 citation statements)

References 40 publications

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“…Gu et al [6] configured uneven building layouts and non-uniform street canyons and used CFD simulations to study the effects of building layouts on the wind environment in non-uniform street canyons under various building arrangements. The results show that the air flows in the non-uniform street canyons are more complex than in the uniform street canyon.…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

Kuo

Tzeng

Ho³

et al. 2015

Energies

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Abstract:The pedestrian-level wind environment quality in street canyons formed by high-rise buildings and other low-level buildings could be affected by multiple factors, such as the height and geometry of the surrounding buildings, street width, wind direction, and wind speed. This study conducted wind tunnel experiments to determine the characteristics of the pedestrian-level wind environment in street canyons under different conditions, including different street widths, podium heights, and approaching wind directions. The experimental results revealed that the effects of the street canyon width on the pedestrian-level wind in a street canyon can be categorized into three different flow regimes. A higher podium creates stronger wind speeds of the flow within the street canyon, and different approaching wind directions change the high-wind-speed zone within the street canyon accordingly.

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Section: Introductionmentioning

confidence: 99%

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

Kuo

Tzeng

Ho³

et al. 2015

Energies

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“…It is therefore important to understand the dispersion and diurnal variation characteristics of pollutants in the street canyons under various urban meteorological conditions, to formulate effective strategies such as positioning of ventilation air intake, for emission control; and for urban planning. Several methods, such as laboratory-scale experiments (Pavageau and Schatzmann, 1999;Ahmad et al, 2005), in-situ measurements (Li et al, 2007;Murena et al, 2009;Shen et al, 2010;, computation fluid dynamics (CFD) simulations (Walton and Cheng, 2002;Xie et al, 2009;Gu et al, 2011;, have been used to investigate the airflow and pollutant dispersion in urban street canyons.…”

Section: Introductionmentioning

confidence: 99%

Measurement Study of Diurnal Variations of PM2.5 Mass Concentrations and Affecting Factors on Pollutant Dispersion in Urban Street Canyons under Weak-Wind Conditions in Xi’an

Zhang

Cheng

et al. 2012

Aerosol Air Qual. Res.

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Daytime variations of PM 2.5 concentration in three street canyons in Xi'an were measured during June 11-15, 2010. Weather conditions, including the ambient wind condition and the street canyon air temperature, were also recorded. These measurements were conducted on weak-wind summer days, when the mean ambient wind velocity was 1.26 m/s. The results show that, under weak-wind conditions, there were no good correlation between PM 2.5 concentrations and vehicle flux inside the street canyons. The vehicle related PM 2.5 concentrations accumulated in the daytime inside the street canyons. The PM 2.5 concentrations at the pedestrian level were of near uniform horizontal distribution. These results indicate the absence of the typical primary air flow re-circulation inside the street canyons under weak-wind conditions, and that the dispersion and transportation of vehicle exhausts inside and/or outside the street canyons are influenced by vehicle induced air flow and thermal induced buoyancy.

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“…Another reason is the difference in geometry of the urban environment under consideration. The idealised models provide more uniformity in the flow and efface the flow structures of the individual buildings [41,42]. A third source of the apparent contradiction is the difference in the measurement locations.…”

Section: Mean Velocity and Turbulent Stress Profilesmentioning

confidence: 99%

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

Reda

Zulkifli²,

Harun³

2017

J. MECH. ENG. SCI.

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Wind flow through urban areas is studied either by wind tunnel scale experiments or via computational fluid dynamics simulations through full-scale actual models. The large difference between the Reynolds numbers based on the geometries of actual cities and wind tunnel scale cities makes the dynamic similarity between the two models uncertain. In this study, the mean and turbulent flow parameters were investigated using a large eddy simulation for two models i.e. the actual urban area model and the wind tunnel scale (1:1000) model. Kuala Lumpur City Centre, Malaysia, was considered as the case study of an urban area. Vertical velocity profiles were plotted at five locations representing different building packing densities. The results of wind tunnel scale model largely agreed with the actual model with some discrepancies in the building vicinity and wakes. The dissimilarity of the wake patterns due to the large difference in Re was responsible for the deviations. Largest discrepancies were found in the lateral and wall-normal velocity components and turbulence stresses. The results casted a shadow on the applicability of the conclusions derived from the simulations on wind tunnel scale models to the actual urban environments they represented. The deviation between the two models should be assessed before proceeding with experimental or numerical simulations on small-sized models.

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Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons

Cited by 160 publications

References 40 publications

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

Measurement Study of Diurnal Variations of PM2.5 Mass Concentrations and Affecting Factors on Pollutant Dispersion in Urban Street Canyons under Weak-Wind Conditions in Xi’an

Large eddy simulation of wind flow through an urban environment in its full-scale wind tunnel models

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