Pollutant Plume Dispersion in the Atmospheric Boundary Layer over Idealized Urban Roughness

Wong, Colman C. C.

doi:10.1007/s10546-012-9785-7

Cited by 18 publications

(10 citation statements)

References 59 publications

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“…3a) [52]. For the full range of aspect ratios, it is comparable to our previous RANS calculation [53] consisting of less street canyons in a shallower vertical extent (H = 6h), as well as our previous large-Eddy simulation (LES) with idealized periodic street canyons [54]. Whereas, our LES based on an isolated street canyon [55] overpredicted the friction factor in small aspect ratio in the isolated roughness regime.…”

Section: Model Validationsupporting

confidence: 86%

“…Instead, the PCH is only peaked at 0.5 ≤ h/b ≤ 1 in which a single recirculation is observed spinning the whole street canyon. The PCH calculated by the current RANS k-model shows a good agreement with various datasets available in literature [62][63][64] and our previous studies [36,53,54], demonstrating the reliability of our current CFD sensitivity tests.…”

Section: Model Validationsupporting

confidence: 86%

“…Recently, it was found empirically that the ventilation of idealized rectangular buildings increases with increasing friction factor [54,55]. In view of the analytical relation derived in Section 3.4 and the similar trends of friction factor and ACH for idealized rectangular buildings as functions of aspect ratio ( Fig.…”

Section: Ventilation Estimatementioning

confidence: 62%

“…Also shown in Fig. 4 are the turbulent ACH data of our previous LES based on rectangular building models [54]. Although the LES results do not fall into the narrow range of the RANS k-turbulence model results, they exhibit a monotonic behavior with the square root of friction factor.…”

Section: Ventilation Estimatementioning

confidence: 87%

“…In k-type flows, the LES and RANS calculations agree well with each other. When the street width is reduced moving into the dtype flows, the ACH calculated by the two studies using RANS kturbulence model ( [53] and the current paper) is more uniform while the LES [54,55] decreases with reducing street width. The dissimilarities are likely caused by the uncertainty of modeling the effect of roof-level fine-scale turbulent motions on the mean flow by the RANS k-turbulence model for flows over narrow building separation.…”

Section: Model Validationmentioning

confidence: 92%

See 4 more Smart Citations

A theory of ventilation estimate over hypothetical urban areas

Liu

Wong

2015

Journal of Hazardous Materials

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Section: Model Validationsupporting

confidence: 86%

Section: Model Validationsupporting

confidence: 86%

Section: Ventilation Estimatementioning

confidence: 62%

Section: Ventilation Estimatementioning

confidence: 87%

Section: Model Validationmentioning

confidence: 92%

See 3 more Smart Citations

A theory of ventilation estimate over hypothetical urban areas

Liu

Wong

2015

Journal of Hazardous Materials

Self Cite

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Heat Transfer and Pollutant Dispersion in Street Canyons

Ming

Peng

Gong

et al. 2017

Pollutant Dispersion in Built Environment

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Air pollutant dispersion around high-rise building cluster forms: the case of Port City, Colombo, Sri Lanka

Vidanapathirana

Perera

Emmanuel

et al. 2023

Environ Sci Pollut Res

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Air quality in dense urban environments is a growing concern, especially in rapidly developing cities. In the face of growing tra c associated with urbanization, there is evidence for high levels of pollutant concentration at street level which is in uenced by building forms. In this paper, we examine the potential effects of high-rise, cluster developments permitted by the local planning authorities in the newly established Port City development in Colombo, Sri Lanka. We designed possible building forms based on speci c guidelines for the development in terms of plot coverage, oor area ratio, and maximum height. The three-dimensional building clusters were simulated using the RANS k-epsilon turbulence model, to determine pollutant dispersion of a complex street formation in a high dense high-rise building cluster, within the development and the surrounding context (existing Colombo).Results show that in a complex building cluster there is no single building form which will provide uniformly better pollution dispersion across the development. Flow patterns are signi cantly affected by the building morphology, context, and ambient wind direction. Thus, individual building permits should be considered in their contexts and surrounding geometries need to be accounted for.

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Pollutant Plume Dispersion in the Atmospheric Boundary Layer over Idealized Urban Roughness

Cited by 18 publications

References 59 publications

A theory of ventilation estimate over hypothetical urban areas

A theory of ventilation estimate over hypothetical urban areas

Heat Transfer and Pollutant Dispersion in Street Canyons

Air pollutant dispersion around high-rise building cluster forms: the case of Port City, Colombo, Sri Lanka

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