Simulations of the dispersion of reactive pollutants in a street canyon,considering different chemical mechanisms and micromixing |
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| Authors: | A. Garmory I.S. Kim R.E. Britter E. Mastorakos |
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| Affiliation: | 1. School of Mechanical Engineering, Tongji University, Cao''an Road 4800, Shanghai 201804, China;2. East China Architectural Design & Research Institute, Hankou Road 151, Shanghai 200002, China;1. Tohoku University, Sendai, Japan;2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland;3. ETH, Swiss Federal Institute of Technology, Zürich, Switzerland;1. Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, University of Salento, S.P. 6 Lecce-Monteroni, 73100 Lecce, Italy;2. Environment Department, Research Center for Energy, Environment and Technology (CIEMAT), Spain |
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| Abstract: | 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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