Pedestrian-level wind speed enhancement in urban street canyons with void decks

Chew, Lup Wai; Norford, Leslie K.

doi:10.1016/j.buildenv.2018.09.039

Cited by 48 publications

(24 citation statements)

References 53 publications

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“…As shown in Fig. 4, the numerical simulation results of the reference case are in good agreement with the experimental results, which indicates that the selection model calculation parameters are correct (Chew et al 2018). For assessing the air quality of a street canyons, the pollution level at pedestrian height (1.5 m above ground) must be investigated (Ng et al 2014).…”

Section: Validation Of the Modelsupporting

confidence: 63%

“…When the buildings in the central area rise to be the highest one, the horizontal wind speed of pedestrian-level reached the highest speed (Tse et al 2017). Chew et al (2018) used both experimental and numerical methods to investigate pedestrian-level wind speed enhancement with void decks in urban street canyons. The results showed that the enhanced wind speed was beneficial for pollutant dispersion in tropical cities.…”

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confidence: 99%

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The Numerical Simulation of Uplifted Street Canyon On Flow Field Structure And Pollutant Diffusion

Sun¹,

Song²,

Tao³

et al. 2021

Preprint

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The flow field structure, pollutant concentration distribution and dimensionless concentration evolution of uplifted street canyon has been analyzed in this study. Different from the ideal street canyon, the pollutant concentration distribution of the uplifting street canyon is higher at the bottom, lower at the top, higher at the windward side and lower at the leeward side. The total pollutant concentration (TPC) generally decreases with the increase of leeward building lifting height while the lift height increases with the same total building height or the total building height increases with increase in the lifting height. It is beneficial to the pollutant emission of in street canyon. On the contrary, the TPC increases when the total building height increases with the same lift height. The main reason is that the vertical length of the vortex increases, which is more difficult for pollutants to be discharged from the street canyon.

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Section: Validation Of the Modelsupporting

confidence: 63%

mentioning

confidence: 99%

The Numerical Simulation of Uplifted Street Canyon On Flow Field Structure And Pollutant Diffusion

Sun¹,

Song²,

Tao³

et al. 2021

Preprint

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show abstract

“…Binaların geometrik özellikleri, binalar etrafında oluşan hava akışını etkilediğinden, yaya seviyesinde ortaya çıkan istenmeyen rüzgar etkilerini azaltmak için özel bina tasarımları kullanılmaktadır. Binalarda yükseltme yapılarak gerçekleştirilen geometrik değişiklikler, yaya seviyesindeki rüzgar konforunu arttırmaktadır [11,12,13,14]. Yaya konforuna yönelik sayısal çalışmalarda Reynolds Ortalamalı Navier-Stokes (RANS) denklemlerini çözen modeller etkin olarak kullanılmaktadır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Numerical Investigation of the Effect of Angle Between Angularly Positioned Two Buildings on Velocity and Pressure Distribution

Cürebal

Özmen

2022

Politeknik Dergisi

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Bu çalışmada, açılı konumlandırılmış iki bina modeli etrafındaki akış alanlarının üç boyutlu sayısal çözümü gerçekleştirilmiştir. Çözümlerde Standard k-ɛ, RNG k-ɛ, Realizable k-ɛ ve Standard k-ω türbülans modelleri karşılaştırmalı olarak kullanılmış ve açılı konumlandırılmış bina modelleri etrafındaki akış için türbülans modellerinin duyarlılıkları araştırılmıştır. Türbülans modellerinin deneysel veriler karşısındaki duyarlılıkları incelendiğinde, Standard k-ε türbülans modelinin kullanılmasıyla elde dilen sonuçların, deneysel verilerle daha uyumlu olduğu görülmüştür. Farklı bina açıları için gerçekleştirilen bu çalışmada, akış alanının tamamına ait hız ve basınç dağılımları Reynolds sayısının 7,7x105 değeri için ayrıntılı olarak incelenmiştir. Genişleyen geçitlerde, binalar arasındaki geçidin merkezi çizgisi boyunca elde edilen K değerleri, daralan geçitlerdeki K değerlerinden çok daha büyük olarak elde edilmiştir. Binalar arasındaki açının 0°-180° arasında değiştiği 8 farklı bina konfigürasyonu için, açısal değişimin bina modelleri yüzeyindeki basınç katsayısı dağılımlarına etkisi incelendiğinde, daralan ve genişleyen bina konfigürasyonlarında, en kritik negatif basınç katsayısı değerlerinin binalar arasındaki açının değişiminden etkilendiği görülmüştür. Anahtar Kelimeler: Bina aerodinamiği, hesaplamalı akışkanlar dinamiği, türbülanslı akış, türbülans modeli.

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“…[1][2][3][4] Low wind speeds promote the accumulation of air contaminants inside street canyons that adversely affect the air quality in an outdoor environment. 5,6 However, too strong wind around a building may cause discomfort or even danger to pedestrians. 7 Thus, to strike a balance is crucial by achieving an acceptable level of wind comfort and allowing an urban area to self-ventilate, but it is rather tricky and challenging.…”

Section: Introductionmentioning

confidence: 99%

“…9 However, the benefit of sufficient airflow in the outdoor environment could be significantly diminished and offset by the blockage effects from buildings or other urban structures in an urban setting. 6,[10][11][12] The effect of reduced wind speed is particularly apparent in building wakes and leeward sides of the building. Building shapes and orientations could influence the environmental wind condition, and their proper design can help improve both the perceived wind comfort at pedestrian level 13 and the surface pressure distribution.…”

Section: Introductionmentioning

confidence: 99%

Effects of different wind directions on ventilation of surrounding areas of two generic building configurations in Hong Kong

Lee

Mak

2021

Indoor and Built Environment

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This study investigated effects of incident wind angles on wind velocity distributions in wakes of two generic building configurations, namely, ‘T’- and ‘+’-shaped, and the air pressure distributions along their leeward walls by using computational fluid dynamics simulations. Results show that when the wind approaches laterally (90°) (vs. when the wind is direct (0°)), the downwind length and maximum bilateral width of the low-wind velocity zone in the wake of ‘T’-shaped building decrease by 11.5% and 37.9%, respectively. When the incident wind is oblique (45°) (vs. when it is direct), the length and width of this low-wind velocity zone in the wake of ‘+’-shaped building decrease by 15.0% and 30.9%, respectively. Furthermore, results show that the air pressure on the leeward walls of the ‘T’- and ‘+’-shaped buildings gradually decreases along with the building height. The resulting low-wind conditions on upper floors of buildings reduce the fresh air intake of their leeward units utilizing natural ventilation. It is particularly apparent in the case of direct approaching wind. Thus, the appropriate selection of building configurations and their orientations allows for the most effective use of wind to enhance ventilation in indoor and urban environments.

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Pedestrian-level wind speed enhancement in urban street canyons with void decks

Abstract: The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. CitationChew, Lup Wai and Leslie K. Norford. "Pedestrian-level wind speed enhancement in urban street canyons with void decks." Building and Environment 146 (December 2018

Cited by 48 publications

References 53 publications

The Numerical Simulation of Uplifted Street Canyon On Flow Field Structure And Pollutant Diffusion

The Numerical Simulation of Uplifted Street Canyon On Flow Field Structure And Pollutant Diffusion

Numerical Investigation of the Effect of Angle Between Angularly Positioned Two Buildings on Velocity and Pressure Distribution

Effects of different wind directions on ventilation of surrounding areas of two generic building configurations in Hong Kong

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