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Simulations of the dispersion of reactive pollutants in a street canyon, considering different chemical mechanisms and micromixing

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journal contribution
posted on 07.12.2012, 11:34 authored by Andrew GarmoryAndrew Garmory, I.S. Kim, R.E. Britter, E. Mastorakos
The Stochastic Fields (SF) or Field Monte Carlo method has been used to model the dispersion of reactive scalars in a street canyon, using a simple chemistry and the CBM-IV mechanism. SF is a Probability Density Function (PDF) method which allows both means and variances of the scalars to be calculated as well as considering the effect of segregation on reaction rates. It was found that the variance of reactive scalars such as NO2 was very high in the mixing region at roof-top level with rms values of the order of the mean values. The effect of segregation on major species such as O3 was found to be very small using either mechanism, however, some radical species in CBM-IV showed a significant difference. These were found to be the seven species with the fastest chemical timescales. The calculated photostationary state defect was also found to be in error when segregation is neglected.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

GARMORY, A. ... et al., 2009. Simulations of the dispersion of reactive pollutants in a street canyon, considering different chemical mechanisms and micromixing. Atmospheric Environment, 43 (31), pp. 4670 - 4680.

Publisher

© Elsevier Ltd.

Version

AM (Accepted Manuscript)

Publication date

2009

Notes

This article was published in the journal, Atmospheric Environment [© Elsevier Ltd.] and the definitive version is available at: http://dx.doi.org/10.1016/j.atmosenv.2008.07.033

ISSN

1352-2310

Language

en