Concentration fluctuations of a passive scalar in a turbulent boundary layer
This experimental study analyses the dynamics of concentration fluctuations in a passive plume emitted by a point source within the turbulent boundary layer. We aim to extend the popular study of Fackrell and Robins (1982) about concentration fluctuations and fluxes from point sources by including t...
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| Language: | ENG |
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Ecole Centrale de Lyon
2013
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| Online Access: | http://tel.archives-ouvertes.fr/tel-00964852 http://tel.archives-ouvertes.fr/docs/00/96/48/52/PDF/TH_T2351_cnironi.pdf |
| Summary: | This experimental study analyses the dynamics of concentration fluctuations in a passive plume emitted by a point source within the turbulent boundary layer. We aim to extend the popular study of Fackrell and Robins (1982) about concentration fluctuations and fluxes from point sources by including third and fourth moments of concentration. We also further inquire into the influence of source conditions, such as the source size, source elevation and emission velocity, on higher order concentration moments. The data set is completed by a detailed description of the velocity statistics within the TBL, with exhaustive information on both the temporal and spatial structure of the flow. The experimental data-set has been used to test two different modeling ap- proaches: an analytical meandering plume model (in one and in three dimen- sions) and a Lagrangian stochastic micro-mixing model. |
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