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• W2023106012 endingPage "2756" @default.
• W2023106012 startingPage "2740" @default.
• W2023106012 abstract "This paper presents computational simulations of atmospheric dispersion experiments conducted around isolated obstacles in the field. The computational tool used for the simulations was the code ADREA-HF, which was especially developed for the simulation of the dispersion of positively or negatively buoyant gases in complicated geometries. The field experiments simulated involve a single cubic obstacle normal to the mean wind direction and two upwind sources of ammonia and propane, with the ammonia source located at different lateral positions [Mavroidis, I., Griffiths, R.F., Hall, D.J., 2003. Field and wind tunnel investigations of plume dispersion around single surface obstacles. Atmospheric Environment 37, 2903–2918]. Concentrations and concentration fluctuations for both gases were calculated by the model and compared with the experimental results. Certain modelling aspects were studied, such as the effect of using different turbulence closure schemes in the computations. Furthermore, specific characteristics of dispersion were investigated using the computational tool, such as the effect of the lateral displacement of a source on the concentration fluctuations intensity, the effects of natural variability and the sensitivity of concentrations to wind direction fluctuations. The results showed a good level of agreement between calculated and measured concentrations and concentration fluctuations when ensemble averaged data were available from the field experiments. Differences observed between measured and predicted concentrations and concentration fluctuations, in the case of laterally displaced sources, were mainly attributed to the specificities of the experimental cases, such as the interaction of a laterally displaced plume with an obstacle, and to the variability observed in the field. The effect of this variability is indicated by the difference between the predicted-to-observed ratios of ensemble-averaged centreline values for propane and the respective ratios from the single ammonia experiment with co-located gas sources, the latter being higher by upto 30% for concentrations and 70% for concentration fluctuations. Using the computational tool it was shown that, for a laterally displaced source, a change of 5° in the mean wind direction can lead up to a 100% variation in the measured concentrations." @default.
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• W2023106012 date "2007-04-01" @default.
• W2023106012 modified "2023-10-14" @default.
• W2023106012 title "Atmospheric dispersion in the presence of a three-dimensional cubical obstacle: Modelling of mean concentration and concentration fluctuations" @default.
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• W2023106012 doi "https://doi.org/10.1016/j.atmosenv.2006.11.051" @default.
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