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Boundary-Layer Meteorology

, Volume 145, Issue 3, pp 469–484 | Cite as

Effect of Incoming Turbulent Structure on Pollutant Removal from Two-Dimensional Street Canyon

  • Takenobu MichiokaEmail author
  • Ayumu Sato
Article

Abstract

Large-eddy simulations are conducted to investigate the effects of the incoming turbulent structure of the flow on pollutant removal from an ideal canyon. The target canyon is a two-dimensional street canyon with an aspect ratio of 1.0 (building height to street width). Three turbulent flows upwind of the street canyon are generated by using different block configurations, and a tracer gas is released as a ground-level line source at the centre of the canyon floor. Mean velocity profiles for the three flows are similar, except near the roof. However, the root-mean-square values of the velocity fluctuations and the Reynolds shear stress increase with the friction velocity of the incoming turbulent flow. The spatially-averaged concentration within the canyon decreases with increasing friction velocity. Coherent structures of low-momentum fluid, generated above the upwind block configurations, contribute to pollutant removal, and the amount of pollutant removal is directly related to the size of the coherent structure.

Keywords

Coherent structures Gas exchange Large-eddy simulation Urban street canyon 

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Environmental Science Research LaboratoryCentral Research Institute of Electric Power IndustryChiba-kenJapan

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