Wind tunnel measurements of pollutant turbulent fluxes in urban intersections

Carpentieri, Matteo; Hayden, Paul; Robins, Alan

doi:10.1016/j.atmosenv.2011.09.083

Cited by 54 publications

(51 citation statements)

References 14 publications

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“…These properties depend strongly on the local geometry and existing models generally relate them to the mean building height (H b ) and the lambda parameters (λ p , and λ f , see above). Recent studies (Carpentieri et al 2009(Carpentieri et al , 2012aCarpentieri and Robins, 2010;Harms et al, 2011;Klein et al, 2011), however, have highlighted the complexity of the flow and dispersion fields in actual urban geometries (as opposed to idealised building arrangements). It is clear from such studies that more parameters (such as building height variability and building aspect ratio) should be taken into account for a more accurate prediction of flow and dispersion in actual urban canopies.…”

Section: Introductionmentioning

confidence: 99%

Influence of urban morphology on air flow over building arrays

Carpentieri

Robins

2015

Journal of Wind Engineering and Industrial Aerodynamics

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Section: Introductionmentioning

confidence: 99%

Influence of urban morphology on air flow over building arrays

Carpentieri

Robins

2015

Journal of Wind Engineering and Industrial Aerodynamics

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“…Characteristics of the transport pollution within the street intersection can be found in recent works [4][5][6]. Understanding processes of pollution transport in complex urban areas is important for estimation of ventilation intensity in the polluted street canyons, for finding suitable configuration of built-up areas and for developing local scale dispersion models.…”

Section: Introductionmentioning

confidence: 99%

Quadrant analysis of turbulent pollution flux above the modelled street intersection

Kukačka

Nosek²,

Kellnerová³

et al. 2013

EPJ Web of Conferences

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Abstract. The objective of this experimental study is to determine processes of a vertical turbulent pollution transport above the X-shaped street intersection in an idealised symmetric urban area for several approach flow directions. An experimental set-up for simultaneous measurement of the flow velocity and the tracer gas concentration in a high temporal resolution is assembled. Vertical turbulent scalar fluxes are computed from the measured data in a horizontal plane above the street intersection. The quadrant analysis was applied to the vertical turbulent pollution fluxes data. Events with dominant contribution to vertical turbulent pollution flux were detected. The mean duration, repetition frequency and the duration percentage were computed for these events. A strong influence of the approach flow direction on the the type of dominant events and their characteristics was resolved.

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“…A pollution transfer within a model of a real street intersection in Central London (DAPPLE series of projects) was balanced in [7]. Finally, the investigation of advective and turbulent fluxes within street intersections in a complex urban area was presented in [8]. We used similar experimental method in the present paper.…”

Section: Introductionmentioning

confidence: 99%

“…A significant role of a building geometry influence on the flow patterns and pollutant dispersion was proved in [9]. Highly three-dimensional flow and an important role of a turbulent pollution exchange at roof level above the street intersections was demonstrated in [8,10]. Mechanisms of the turbulent mass transport above the street intersection were subsequently analysed in [11].…”

Section: Introductionmentioning

confidence: 99%

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Ventilation of idealised urban area, LES and wind tunnel experiment

Kukačka

Fuka

Nosek

et al. 2014

EPJ Web of Conferences

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Abstract. In order to estimate the ventilation of vehicle pollution within street canyons, a wind tunnel experiment and a large eddy simulation (LES) was performed. A model of an idealised urban area with apartment houses arranged to courtyards was designed according to common Central European cities. In the wind tunnel, we assembled a set-up for simultaneous measurement of vertical velocity and tracer gas concentration. Due to the vehicle traffic emissions modelling, a new line source of tracer gas was designed and built into the model. As a computational model, the LES model solving the incompressible Navier-Stokes equations was used. In this paper, we focused on the street canyon with the line source situated perpendicular to an approach flow. Vertical and longitudinal velocity components of the flow with the pollutant concentration were obtained from two horizontal grids placed in different heights above the street canyon. Vertical advective and turbulent pollution fluxes were computed from the measured data as ventilation characteristics. Wind tunnel and LES data were qualitatively compared. A domination of advective pollution transport within the street canyon was determined. However, the turbulent transport with an opposite direction to the advective played a significant role within and above the street canyon.

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Wind tunnel measurements of pollutant turbulent fluxes in urban intersections

Cited by 54 publications

References 14 publications

Influence of urban morphology on air flow over building arrays

Influence of urban morphology on air flow over building arrays

Quadrant analysis of turbulent pollution flux above the modelled street intersection

Ventilation of idealised urban area, LES and wind tunnel experiment

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