A chemically reactive atmospheric plume of NO undergoing a reaction with O_3 in the atmospheric boundary layer is considered. Predictions of reactive concentrations are made using a relatively new approach for modelling turbulent reacting flows, the conditional moment closure, combined with an assumed form for the probability density function (pdf) of a conserved scalar. Model inputs are the conditional scalar dissipation and the form of the pdf. Model predictions compare well with field data measured in a power station plume. Future research will focus on improvements to the model for the conditional scalar dissipation and the form of the pdf.
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