Flow and dispersion of traffic-emitted pollutants were studied in a generic urban neighborhood for various avenue-tree layouts by employing 3D steady RANS simulations with the realizable k-ε turbulence model. In comparison to the tree-free situation quantitative and qualitative changes with flow reversal in the wind field were observed. Low to moderate increases (<13.2%) in the neighborhood-ave...

Green walls are considered a sustainable and environmental technology for improving the local urban microclimate. The presented wind tunnel measurements reveal coupling effect of aerodynamic thermal resistance green in flat steep street canyons simplified neighborhood model. building ground surfaces set to conditions at series Richardson numbers (Ri) ranging from 0 2.07. induce flow due their h...

Mean wind profiles within a unit-aspect-ratio street canyon have been estimated by solving the three-dimensional Poisson equation for set of discrete vortex sheets. The validity this approach, which assumes inviscid dynamics away from boundaries and small nonlinear contribution to growth turbulent fluctuations, is tested series idealised realistic flows. In paper, effects urban geometry on accu...

In the present paper we have analysed experimentally (wind tunnel) and numerically (CFD) the impact of some morphological parameters on the flow within and above the urban canopy. In particular, this study is a first attempt in systematically studying the flow in and above urban canopies using simplified, yet more realistic than a simple array of cuboids, building arrays. Current mathematical m...

The joint probability density function (PDF) of turbulent velocity and concentration of a passive scalar in an urban street canyon is computed using a newly developed particle-in-cell Monte Carlo method. Compared to moment closures, the PDF methodology provides the full one-point one-time PDF of the underlying fields containing all higher moments and correlations. The small-scale mixing of the ...

Urban microclimate modelling, both numerical and in the laboratory, has strong implications many relevant health life-style management issues e.g., studies for assessment forecast of air quality (for outdoor and, as boundary conditions, indoor investigations), thermometric trend analysis urban zones, cultural heritage preservation, etc. Moreover, study modelling is largely promoted encouraged b...

in recent years many transformations have occurred in iranian society and women and girls still have a lot of worries about comes to urban public spaces. also, due to some ambiguities in defining the domain of public space in traditional islamic cities and gaps in the knowledge related to the kurdish cities, the main problem of this paper is how we can define a participatory approach to improve...

In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at r...

3 Dispersion of particles, as evidenced by changes in their number distributions (PNDs) and 4 concentrations (PNCs), in urban street canyons, is still not well understood. This study compares 5 measurements by a fast–response particle spectrometer (DMS500) of the PNDs and the PNCs (5– 6 1000 nm, sampled at 1 Hz) at street and rooftop levels in a Cambridge (UK) street canyon, and 7 examines mixi...

Changes in urban geometry significantly alters the microclimate. Suitable geometrical layouts can effectively improve thermal environment to achieve a more sustainable and healthier city. A quantitative assessment of relationship between is essential provide scientific guidance for better building design. Hence, we performed scaled outdoor measurement investigate diurnal variations air, west ea...