The Proceedings of the Fluids engineering conference
Online ISSN : 2424-2896
2013
Conference information
G0901 Effect of atmospheric turbulent structure on gas dispersion in urban canyon
Takenobu MICHIOKAHiroshi TAKIMOTOAyumu SATO
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CONFERENCE PROCEEDINGS FREE ACCESS

Pages _G0901-01_-_G0901-03_

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Abstract
Large-eddy simulation was conducted to investigate the mechanism of pollutant removal from the there-dimensional street canyon. A tracer gas was released as a ground-level continuous gas line source at the center between three dimensional blocks. The results show that at least 75% of total emissions from the three-dimensional street canyon were attributable to turbulent motions. Pollutant removal by turbulent motions was related to the coherent structures of low-momentum fluid above the canyons. Though the coherent structure size of the low-momentum fluid differed, the positions of low-momentum fluid largely corresponded to instantaneous high concentrations of pollutant above the target canyon, irrespective of canyon geometry.
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© 2013 The Japan Society of Mechanical Engineers
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