Recent Advances in Urban Ventilation Assessment and Flow Modelling

Buccolieri, Riccardo; Hang, Jian

doi:10.3390/atmos10030144

Cited by 27 publications

(8 citation statements)

References 26 publications

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“…In urban areas microclimate and ventilation, and thus thermal comfort, are strictly interconnected with built form and building packing density, as clearly stated in the literature, see for example recent reviews by Lin et al [5], Toparlar et al [8], Di Sabatino et al [14], Buccolieri and Hang [15]. The built form is commonly represented through morphological parameters such as the building density, the volume ratio, the street height to width ratio (aspect ratio), the plane permeability, the sky view factor, and so on.…”

Section: Introductionmentioning

confidence: 91%

A Numerical Study on the Correlation between Sky View Factor and Summer Microclimate of Local Climate Zones

2019

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In the context of urbanization, research on urban microclimate and thermal comfort has become one of the themes of eco-city design. Sky view factor (SVF), one of the parameters of urban spatial form, combines multiple morphological information, such as plane opening, aspect ratio, and building density and has an important impact on the urban microclimate. However, there is still no clear research conclusion on the correlation between SVF and microclimate. In this paper, nine Local Climate Zone (LCZ) models are used and typical summer meteorological conditions of Nanjing are applied as an attempt to partially fill this gap. The calculated microclimate and thermal comfort indices include air temperature (AT), surface temperature (ST), relative humidity (RH), wind speed (WS), mean radiant temperature (MRT), and predicted mean vote (PMV). Results show that the local effect of urban morphology on thermal comfort can be retrieved from the use of comprehensive parameters such as SVF (which takes into account the building height, layout, and density) whose distribution in the investigated models showed to be correlated with MRT, so did PMV under low wind speed conditions.

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Section: Introductionmentioning

confidence: 91%

A Numerical Study on the Correlation between Sky View Factor and Summer Microclimate of Local Climate Zones

2019

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“…Luckily, the latest numerical modelling techniques, computational resources, and remote scanning datasets do offer tantalizing opportunities to examine realistic urban flow schenarios with models that describe the urban surface with an ever increasing level of detail. Particularly Large-Eddy Simulation (LES), a modelling approach in the field of Computational Fluid Dynamics (CFD) capable of temporally and spatially resolving the relevant turbulent processes governing the transport and exchange of momentum, energy, and materials between the urban surface and the ambient air, provides a well-established modelling framework with which the relevant turbulent processes in complex UBL flows can be simulated [8,9].…”

Section: Introductionmentioning

confidence: 99%

Study of Realistic Urban Boundary Layer Turbulence with High-Resolution Large-Eddy Simulation

et al. 2020

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This study examines the statistical predictability of local wind conditions in a real urban environment under realistic atmospheric boundary layer conditions by means of Large-Eddy Simulation (LES). The computational domain features a highly detailed description of a densely built coastal downtown area, which includes vegetation. A multi-scale nested LES modelling approach is utilized to achieve a setup where a fully developed boundary layer flow, which is also allowed to form and evolve very large-scale turbulent motions, becomes incident with the urban surface. Under these nonideal conditions, the local scale predictability and result sensitivity to central modelling choices are scrutinized via comparative techniques. Joint time–frequency analysis with wavelets is exploited to aid targeted filtering of the problematic large-scale motions, while concepts of information entropy and divergence are exploited to perform a deep probing comparison of local urban canopy turbulence signals. The study demonstrates the utility of wavelet analysis and information theory in urban turbulence research while emphasizing the importance of grid resolution when local scale predictability, particularly close to the pedestrian level, is sought. In densely built urban environments, the level of detail of vegetation drag modelling description is deemed most significant in the immediate vicinity of the trees.

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“…Computational Fluid Dynamics is a time-saving, low-cost, and accurate method of wind research [27,28]. In the evaluation of building ventilation, the index of the urban building form is quantified and the weight relationship between each index is determined through Computational Fluid dynamics (CFD) data analysis [29][30][31].…”

Section: The Ventilation Index Of Street Orientation and Lengthmentioning

confidence: 99%

The Ventilation Path Assessment of Urban Street in Wuhan

Yin¹,

Zhan²,

Tayyab³

2021

Pol. J. Environ. Stud.

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The urban ventilation path can help to alleviate the heat island effect and air pollution. The building ventilation method is based on building front area density, the building data is divided into grids with numerical attributes, to detect ventilation path. The urban morphology is including building and street, while this building method ignores the ventilation path of the urban street. The streets are most closely connected with people's lives. The direction of the street is the main evaluation index to extract the street ventilation path, which is the supplement of the building method. The spatial analysis technology of Geographic Information System (GIS) was used to calculate the front area density, the street direction, the street length, and the street aspect ratio. These indicators are related to ventilation potential and simulated by Computational Fluid dynamics (CFD). Under different wind directions including the vertical and parallel to the street, it found that the street ventilation potential is different as to the street aspect ratio, if the wind direction is parallel to the street, the street ventilation is better with the decrease of street aspect ratio; if the wind direction is perpendicular to the street, the street ventilation is better with the increase of the street aspect ratio. In the grids of high front area density, there are also some potential ventilation urban streets.

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Recent Advances in Urban Ventilation Assessment and Flow Modelling

Abstract: The Atmosphere Special Issue “Recent Advances in Urban Ventilation Assessment and FlowModelling” collects twenty-one original papers and one review paper published in 2017[...]

Cited by 27 publications

References 26 publications

A Numerical Study on the Correlation between Sky View Factor and Summer Microclimate of Local Climate Zones

A Numerical Study on the Correlation between Sky View Factor and Summer Microclimate of Local Climate Zones

Study of Realistic Urban Boundary Layer Turbulence with High-Resolution Large-Eddy Simulation

The Ventilation Path Assessment of Urban Street in Wuhan

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