Revisit of Wind Flows between Wind Tunnels and Real Canyons – The Viewpoint of Reynolds Dynamic Similarity

Zhang, Yunwei; Gu, Zhaolin; Wang, Zan-She; Yu, Chuck Wah

doi:10.1177/1420326x12489064

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In-situ measurements, wind tunnel and numerical simulations have been conducted to determine air flow and pollutants' dispersion characteristics in an urban street canyon (Zhang et al, 2013a). Depaul et al's (1986) in-situ measurements showed that turbulences induced by moving vehicles could reach up to a height of 7 m in an urban street canyon.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Vehicle Induced Turbulence in an Urban Street Canyon with a New Dynamically Vehicle-Tracking Scheme

Zhang

2017

Aerosol Air Qual. Res.

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Moving vehicles could have a considerable influence on air flow and turbulence within urban street canyons, especially the vehicle induced turbulence (VIT), which is an important consideration for pollutants' dispersion and local air quality management. To simulate air flow in urban street canyons with moving vehicles, an Euler-Lagrangian method was further developed by this study. The method involved dynamically tracking each moving vehicle and determining the vehicle induced drag force on surrounding air. Simulations under different background wind velocities and vehicle speeds show that, moving vehicles could pose a strong effect on wind turbulence, but have a lesser effect on average wind field within a street canyon. The presence of VIT was mainly in the lower areas of a street canyon. The average standard deviation of velocity (σ w0 ) in the lower areas is about 0.5 m s -1 . In comparison with theoretical and experimental VIT models, VIT values produced by our simulations were higher than those obtained by experimental model, and were slightly lower than those produced by theoretical model. Instantaneous air flow fields within a street canyon were also investigated. Our results have indicated that the existence of local eddies could be a contribution factor to VIT.

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Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Vehicle Induced Turbulence in an Urban Street Canyon with a New Dynamically Vehicle-Tracking Scheme

Zhang

2017

Aerosol Air Qual. Res.

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“…7,21 The development of simulation parameters for dispersion airflow of ambient air pollutants in urban environment is an important achievement for urban air quality management. 22,23 The triboelectric charging of airborne particles under various humidity conditions is a particular highlight of efforts to understand the possible mechanism for explosive growth of PM 2.5 concentration during pollution episode events that is frequently occurring in winter in China. 24 An Institute for Climate Change and Global Atmospheric Environment was established in 2010 in Xi'an Jiaotong University to monitor the international scientific developments to understand global climate change and warming phenomena, to develop amelioration strategies and to contribute to the national ambient air quality standards and to establish the institute as one of the leading institutions internationally.…”

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confidence: 99%

Human settlement, civil engineering and silk road – Xi’an Jiaotong University, 120-year anniversary

2016

Indoor and Built Environment

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I, your editor, have been visiting Xi'an Jiaotong University since May 2009. I was then appointed Adjunct Professor for five years and ever since, I have been coming to Xi'an every year, the ancient capital of China. Professor Zhaolin Gu, who is the Executive Dean at the School of Human Settlement and Civil Engineering, would like me to take a more active role in the university to provide lectures to the undergraduate and graduate students; to collaborate with the research and to mentor two of his young lecturers at the school, particularly on Atmospheric Pollution, Historical Relics Preservation and Urban and Built Environments. I was later successfully appointed 'Overseas Distinguished Professor' in 2011 for three years funded by the Ministry of Education/State Administration of Foreign Experts in China. This was a great honour, and the university further awarded me the title 'Honorary Professor' in 2012. I was the University's second Overseas Distinguished Professor! The appointment has been renewed and approved in 2015, by the Ministry of Education for another three years, which is another first in the university. I am now becoming very much part of the furniture at Xi'an Jiaotong University, and I have been fascinated and impressed by the subject areas which I have been involved in and contacted with at Xi'an Jiaotong University.The ancient city of Xi'an 1 was the oldest capital of

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Impact Factors on Airflow and Pollutant Dispersion in Urban Street Canyons and Comprehensive Simulations: a Review

Zhang

2020

Curr Pollution Rep

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Revisit of Wind Flows between Wind Tunnels and Real Canyons – The Viewpoint of Reynolds Dynamic Similarity

Cited by 4 publications

References 16 publications

Large Eddy Simulation of Vehicle Induced Turbulence in an Urban Street Canyon with a New Dynamically Vehicle-Tracking Scheme

Large Eddy Simulation of Vehicle Induced Turbulence in an Urban Street Canyon with a New Dynamically Vehicle-Tracking Scheme

Human settlement, civil engineering and silk road – Xi’an Jiaotong University, 120-year anniversary

Impact Factors on Airflow and Pollutant Dispersion in Urban Street Canyons and Comprehensive Simulations: a Review

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