Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation

Arsenios Chatzimichailidis, Marc Assael, Matthias Ketzel, Konstantinos Kakosimos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Poor air quality in cities was indicated as the cause of seven million deaths, one out of eight globally, only in 2012. Urban streets are the epicentre of the problem, as high concentrations are frequently measured, caused mainly by the traffic and secondly by the general urban background pollution. The flow inside street canyons has some specific characteristics that tend to obstruct the removal of pollutants from the city level. The small scale models that are used to study pollution in streets have to consider about these flow patterns, which many times are referred with the collective term recirculation zone. Our main hypothesis is, that the flow regime in a street canyon governs the recirculation zone and consequently the dispersion. Thus, a quasi-universal expression for the recirculation zone could expand the applicability of these simple models in cases of higher complexity. To understand better the recirculation zone, CFD simulations are validated and used. We use vortex detection methods, namely vorticity, streamlines and the λ2 and Q criteria, to visualize the vortex structures. The final results are rather inconclusive, although the combined use of the above methods certainly give some insights to the flow structure. In any case more exploratory analysis is necessary in order to validate the further develop the hypothesis of this work.

Original languageEnglish
Title of host publicationHARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings
PublisherHungarian Meteorological Service
Pages319-323
Number of pages5
Volume2016-May
ISBN (Electronic)9789639931107
Publication statusPublished - 1 Jan 2016
Event17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2016 - Budapest, Hungary
Duration: 9 May 201612 May 2016

Other

Other17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2016
CountryHungary
CityBudapest
Period9/5/1612/5/16

Fingerprint

street canyon
CFD Simulation
Aspect Ratio
Aspect ratio
Pollution
Modeling
modeling
simulation
vortex
Vortex
Vortex flow
Exploratory Analysis
pollution
Air Quality
flow structure
Flow Pattern
Flow structure
Streamlines
Pollutants
detection method

Keywords

  • Air quality models
  • Large Eddy Simulation
  • Recirculation zone
  • Street canyon
  • Vortex detection

ASJC Scopus subject areas

  • Atmospheric Science
  • Pollution
  • Modelling and Simulation

Cite this

Chatzimichailidis, A., Assael, M., Ketzel, M., & Kakosimos, K. (2016). Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation. In HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings (Vol. 2016-May, pp. 319-323). Hungarian Meteorological Service.

Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation. / Chatzimichailidis, Arsenios; Assael, Marc; Ketzel, Matthias; Kakosimos, Konstantinos.

HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings. Vol. 2016-May Hungarian Meteorological Service, 2016. p. 319-323.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chatzimichailidis, A, Assael, M, Ketzel, M & Kakosimos, K 2016, Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation. in HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings. vol. 2016-May, Hungarian Meteorological Service, pp. 319-323, 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2016, Budapest, Hungary, 9/5/16.
Chatzimichailidis A, Assael M, Ketzel M, Kakosimos K. Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation. In HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings. Vol. 2016-May. Hungarian Meteorological Service. 2016. p. 319-323
Chatzimichailidis, Arsenios ; Assael, Marc ; Ketzel, Matthias ; Kakosimos, Konstantinos. / Modelling the recirculation zone in street canyons with different aspect ratios, using cfd simulation. HARMO 2016 - 17th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings. Vol. 2016-May Hungarian Meteorological Service, 2016. pp. 319-323
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