Journal ArticleDOI
On the contribution of mean flow and turbulence to city breathability: the case of long streets with tall buildings.
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TLDR
Analysis of the contribution of mean flow and turbulence to city breathability within urban canopy layers under the hypothesis that winds from rural/marine areas are sources of clean air and main contributors to local-scale pollutant dilution finds breathability improves in streets flanked by lower buildings and pollutant removal by turbulent fluctuations is more effective.About:
This article is published in Science of The Total Environment.The article was published on 2012-02-01. It has received 86 citations till now.read more
Citations
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CFD simulation of outdoor ventilation of generic urban configurations with different urban densities and equal and unequal street widths
TL;DR: In this paper, a detailed review of the literature for CFD studies of outdoor ventilation for generic urban configurations is provided, which indicates that there is a clear lack of studies for urban configurations where not all parallel streets have equal street widths.
A numerical study of the effects of ambient wind direction on flow and dispersion in urban street canyons using the RNG k-ε turbulence model
TL;DR: In this article, a three-dimensional computational fluid dynamics model with the renormalization group k-e turbulence scheme was developed to investigate the effects of ambient wind direction on flow and dispersion around a group of buildings.
Journal ArticleDOI
Enhancing urban ventilation performance through the development of precinct ventilation zones: A case study based on the Greater Sydney, Australia
Bao-Jie He,Lan Ding,Deo Prasad +2 more
TL;DR: In this article, the authors developed a protocol for the precinct ventilation characterization based on the pluridisciplinary method and derived a precinct ventilation zone system according to the compactness + building height + street structure.
Journal ArticleDOI
Quantitative ventilation assessments of idealized urban canopy layers with various urban layouts and the same building packing density
TL;DR: In this paper, the authors investigated urban canopy layers ventilation under neutral atmospheric condition with the same building area density and frontal area density, but various urban sizes, building height variations, overall urban forms and wind directions.
Journal ArticleDOI
CFD and wind-tunnel analysis of outdoor ventilation in a real compact heterogeneous urban area: Evaluation using “air delay”
N Nestoras Antoniou,N Nestoras Antoniou,Hamid Montazeri,Hamid Montazeri,Hans Wigö,Marina Neophytou,Bje Bert Blocken,Bje Bert Blocken,Mats Sandberg +8 more
TL;DR: In this paper, the authors investigated outdoor urban ventilation in a real complex urban area by introducing a new ventilation indicator, the "air delay", and performed computational fluid dynamics (CFD) simulations.
References
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Journal ArticleDOI
Air pollution in mega cities in China
TL;DR: In this paper, the authors present the current state of understanding of the air pollution problems in China's mega cities and identify the immediate challenges to understanding and controlling air pollution in these densely populated areas.
Journal ArticleDOI
AIJ guidelines for practical applications of CFD to pedestrian wind environment around buildings
Yoshihide Tominaga,Akashi Mochida,Ryuichiro Yoshie,Hiroto Kataoka,Tsuyoshi Nozu,Masaru Yoshikawa,Taichi Shirasawa +6 more
TL;DR: In this paper, the authors present guidelines for using computational fluid dynamics (CFD) techniques for predicting pedestrian wind environment around buildings in the design stage, based on cross-comparison between CFD predictions, wind tunnel test results and field measurements.
Journal ArticleDOI
Street design and urban canopy layer climate
TL;DR: In this article, the authors investigated the results of recent urban canyon field studies and of scale and mathematical modelling to find a range of canyon geometries that are compatible with the apparently conflicting design objectives of mid-latitude cities.
Journal ArticleDOI
Flow and dispersion in urban areas
Rex Britter,Steven R. Hanna +1 more
TL;DR: In this article, the authors address flow and dispersion in urban areas at four scales: regional, city, neighborhood, and street, and address the most appropriate framework to study and quantify the result.
Book
Building Ventilation: Theory and Measurement
D.W. Etheridge,Mats Sandberg +1 more
TL;DR: Tracer gas techniques for measuring age distribution and ventilation efficiency are described in this paper. But they are not suitable for the measurement of large internal openings, as shown in Figure 1.