Numerical simulation of pollutant dispersion in street canyons: Geometric and thermal effects

Madalozzo, Deborah Marcant Silva; Braun, Alexandre Luis; Awruch, Armando Miguel; Morsch, Inácio Benvegnu

doi:10.1016/j.apm.2014.04.041

Cited by 49 publications

(17 citation statements)

References 39 publications

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“…Therefore, the need for studying air pollution becomes apparent, since it is recognized as one of the main reasons of a large number of deaths [1]. Air pollution can be studied systematically by adopting various experimental and numerical methods, such as small air quality models (AQMs) [2], wind tunnel experiments [3], field measurements [4], computational fluid dynamics (CFD) models [5][6][7], and semi-empirical models [8,9].…”

Section: Introductionmentioning

confidence: 99%

Qualitative and Quantitative Investigation of Multiple Large Eddy Simulation Aspects for Pollutant Dispersion in Street Canyons Using OpenFOAM

et al. 2019

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Air pollution is probably the single largest environment risk to health and urban streets are the localized, relevant hotspots. Numerous studies reviewed the state-of-the-art models, proposed best-practice guidelines and explored, using various software, how different approaches (e.g., Reynolds-averaged Navier–Stokes (RANS), large eddy simulations (LES)) inter-compare. Open source tools are continuously attracting interest but lack of similar, extensive and comprehensive investigations. At the same time, their configuration varies significantly among the related studies leading to non-reproducible results. Therefore, the typical quasi-2D street canyon geometry was selected to employ the well-known open-source software OpenFOAM and to investigate and validate the main parameters affecting LES transient simulation of a pollutant dispersion. In brief, domain height slightly affected street level concentration but source height had a major impact. All sub-grid scale models predicted the velocity profiles adequately, but the k-equation SGS model best-resolved pollutant dispersion. Finally, an easily reproducible LES configuration is proposed that provided a satisfactory compromise between computational demands and accuracy.

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Section: Introductionmentioning

confidence: 99%

Qualitative and Quantitative Investigation of Multiple Large Eddy Simulation Aspects for Pollutant Dispersion in Street Canyons Using OpenFOAM

et al. 2019

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“…The street canyon is included into a T-shape computational domain (see Figure 3 (b)). This T-shape computational domain configuration and its dimensions are selected, because many previous studies employed such a T-shape computational domain to investigate the atmospheric flow and related processes in a street canyon (e.g., Kim and Baik, 2001;Liu et al, 2004;Xie et al, 2006;Li et al, 2008b;Kumar et al, 2009;Hu et al, 2009;Moonen et al, 2011;Zhang et al, 2011;Baik et al, 2012;Kwak et al, 2013;Allegrini et al, 2014;Madalozzo et al, 2014), among which there are quite a few (e.g., Liu et al, 2004;Li et al, 2008b;Zhang et al, 2011) used such domain dimensions as shown in Figure 3 (b).…”

Section: Cfd Simulations: Geometry and Computational Settings 31 Commentioning

confidence: 99%

Wind-induced single-sided natural ventilation in buildings near a long street canyon: CFD evaluation of street configuration and envelope design

Mak

2018

Journal of Wind Engineering and Industrial Aerodynamics

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“…The wind tunnel experiments of thermal effects on flow within and above urban street canyons were performed [4][5][6], and the convective heat transfer in street canyons was investigated numerically [7,8]. The numerical simulations of heat transfer based on kε turbulence model were studied [9,10], and thermal effects on fluid-dynamic in an urban street canyon were analyzed [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effects of the wind speeds on heat transfer in a street canyon with a skytrain station

2019

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The street under a skytrain station can be seen in many urban cities. Due to the cavity geometry of the street canyon, natural ventilation is decreased. The reduction of the ventilation causes the heat accumulation in the street canyon. To keep the thermal climate at an acceptable level in the street canyon, controlling the air movement with proper temperature is important. In this paper, mathematical models of air flow and heat transfer in the skytrain street canyon are developed. The governing equations are the Reynolds-averaged Navier-Stokes equations and the energy equation. Finite element method is applied for the solution of the problem. The effect of wind speeds on temperature distribution in the street canyon is investigated. Three levels of wind speed including gentle, moderate, and strong wind speeds are chosen in this study. The results indicate that our model can capture the air flow and temperature distribution within a street canyon with a skytrain station.

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Numerical simulation of pollutant dispersion in street canyons: Geometric and thermal effects

Cited by 49 publications

References 39 publications

Qualitative and Quantitative Investigation of Multiple Large Eddy Simulation Aspects for Pollutant Dispersion in Street Canyons Using OpenFOAM

Qualitative and Quantitative Investigation of Multiple Large Eddy Simulation Aspects for Pollutant Dispersion in Street Canyons Using OpenFOAM

Wind-induced single-sided natural ventilation in buildings near a long street canyon: CFD evaluation of street configuration and envelope design

Effects of the wind speeds on heat transfer in a street canyon with a skytrain station

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