Large-eddy simulation of plume dispersion under various thermally stratified boundary layers
Contaminant gas dispersion in atmospheric boundary layer is of great concern to public health. For the accurate prediction of the dispersion problem, the present study numerically investigates the behavior of plume dispersion by taking into account the atmospheric stability which is classified into...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-07-01
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| Series: | Advances in Science and Research |
| Online Access: | http://www.adv-sci-res.net/11/75/2014/asr-11-75-2014.pdf |
| Summary: | Contaminant gas dispersion in atmospheric boundary layer is of great concern
to public health. For the accurate prediction of the dispersion problem, the
present study numerically investigates the behavior of plume dispersion by
taking into account the atmospheric stability which is classified into three
types; neutral, stable, and convective boundary layers. We first proposed an
efficient method to generate spatially-developing, thermally-stratified
boundary layers and examined the usefulness of our approach by comparing to
wind tunnel experimental data for various thermal boundary layers. The
spreads of plume in the spanwise direction are quantitatively underestimated
especially at large downwind distances from the point source, owing to the
underestimation of turbulence intensities for the spanwise component;
however, the dependence of the spanwise spreads to atmospheric stability is
well represented in a qualitative sense. It was shown that the large-eddy
simulation (LES) model provides physically reasonable results. |
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| ISSN: | 1992-0628 1992-0636 |