CFD simulation of outdoor ventilation of generic urban configurations with different urban densities and equal and unequal street widths

Ramponi, R Rubina; Blocken, Bje Bert; Coo, LB de; Janssen, WD Wendy

doi:10.1016/j.buildenv.2015.04.018

Cited by 279 publications

(102 citation statements)

References 84 publications

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“…Buccolieri et al [19] also chose square arrays when investigating influence of longitudinal and lateral spacing; they showed that variations in spacing perpendicular to wind direction had a more noticeable influence on vertical exchanges of air flow. Similar studies have been performed by Di Sabatino et al [20], Hang et al [21][22][23], Ramponi et al [24], Razak et al [25] and Lee et al [26] on building heights, layouts and street widths. In the field of street canyons, as early as 1988, Oke et al [27] identified three types of characteristic flow based on the width/length (w/h) ratio of street sections.…”

Section: Influence Of Wind Conditions On Building Arrangementssupporting

confidence: 62%

Improving Residential Wind Environments by Understanding the Relationship between Building Arrangements and Outdoor Regional Ventilation

et al. 2017

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This paper explores the method of assessing regional spatial ventilation performance for the design of residential building arrangements at an operational level. Three ventilation efficiency (VE) indices, Net Escape Velocity (NEV), Visitation Frequency (VF) and spatial-mean Velocity Magnitude (VM), are adopted to quantify the influence of design variation on VE within different regional spaces. Computational Fluid Dynamics (CFD) method is applied to calculate VE indices mentioned above. Several residential building arrangement cases are set to discuss the effect of different building length, lateral spacing and layouts on four typical space patterns under wind directions oblique or perpendicular to the main (long) building facade. The simulation results prove that NEV, VF and VM are useful VE indices, which can reflect different features of flow pattern in studied regional domains. Preliminary parametric studies indicate that wind direction might be the most important factor for improving spatial ventilation. When the angle between main building facade and wind direction is more than 30 • , ventilation of different exterior spaces could improve evidently. When wind direction is perpendicular to main building façade, decreasing building length can increase NEV of the middle space by 50%, while decreasing lateral spacing would decrease NEV of the intersection space by 35%.

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Section: Influence Of Wind Conditions On Building Arrangementssupporting

confidence: 62%

Improving Residential Wind Environments by Understanding the Relationship between Building Arrangements and Outdoor Regional Ventilation

et al. 2017

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“…Recently, research has been undertaken to study dispersion and ventilation in actual or generic building block arrays with tree-free streets (e.g. Boppana et al, 2010;Borrego et al, 2006Borrego et al, , 2003Buccolieri et al, 2010;Carpentieri et al, 2012;Di Sabatino et al, 2007;Garbero et al, 2010;Hamlyn et al, 2007;Hang et al, 2011;Panagiotou et al, 2013;Pascheke et al, 2008;Princevac et al, 2010;Ramponi et al, 2014;Soulhac et al, 2012Soulhac et al, , 2011Soulhac et al, , 2003Xie and Castro, 2009). It is evident that such study areas provide a more relevant description of the effects of trees on flow and pollutant dispersion than those with isolated street canyons or intersections.…”

Section: Introductionmentioning

confidence: 99%

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Gromke

Blocken

2015

Environmental Pollution

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120

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a b s t r a c tFlow 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-averaged pollutant concentration were found at pedestrian level. An approximately 1% increase in the neighborhood-averaged concentration was obtained with each percent of the street canyon volumes being occupied by vegetation for occupation fractions between 4 and 14%. The overall pattern of concentration changes relative to the tree-free situation was similar for all avenue-tree layouts. However, pronounced locally restricted decreases or increases in concentration (À87 to þ1378%) occurred. The results indicate the necessity to account for existing or planned avenue-trees in neighborhood scale dispersion studies. Their consideration is prerequisite for reliable urban air quality assessment.

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“…Ramponi et al [9] investigated the outdoor ventilation of generic urban configurations with different wind directions on equal and unequal street widths via CFD. Their results showed that the main street can be both beneficial and non-beneficial for the ventilation efficiency of the downstream area depending on the wind directions.…”

Section: Introductionmentioning

confidence: 99%

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

Kuo

Tzeng

Ho³

et al. 2015

Energies

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Abstract:The pedestrian-level wind environment quality in street canyons formed by high-rise buildings and other low-level buildings could be affected by multiple factors, such as the height and geometry of the surrounding buildings, street width, wind direction, and wind speed. This study conducted wind tunnel experiments to determine the characteristics of the pedestrian-level wind environment in street canyons under different conditions, including different street widths, podium heights, and approaching wind directions. The experimental results revealed that the effects of the street canyon width on the pedestrian-level wind in a street canyon can be categorized into three different flow regimes. A higher podium creates stronger wind speeds of the flow within the street canyon, and different approaching wind directions change the high-wind-speed zone within the street canyon accordingly.

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CFD simulation of outdoor ventilation of generic urban configurations with different urban densities and equal and unequal street widths

Cited by 279 publications

References 84 publications

Improving Residential Wind Environments by Understanding the Relationship between Building Arrangements and Outdoor Regional Ventilation

Improving Residential Wind Environments by Understanding the Relationship between Building Arrangements and Outdoor Regional Ventilation

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Wind Tunnel Studies of a Pedestrian-Level Wind Environment in a Street Canyon between a High-Rise Building with a Podium and Low-Level Attached Houses

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