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

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 calcula...

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Bibliographic Details
Main Authors: Andrew Garmory, I.S. Kim, R.E. Britter, E. Mastorakos
Format: Default Article
Published: 2009
Subjects:
Atmospheric sciences not elsewhere classified
Other engineering not elsewhere classified
Statistics not elsewhere classified
Turbulent reacting flows
Stochastic fields
Probability density function
Pollution
Urban
Statistics
Atmospheric Sciences
Engineering not elsewhere classified
Online Access:https://hdl.handle.net/2134/11118
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Summary: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.

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