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| Titel |
Large-Eddy Simulation of Chemically Reactive Pollutant Transport from a Point Source in Urban Area |
| VerfasserIn |
Tangzheng Du, Chun-Ho Liu |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073543
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| Zusammenfassung |
| Most air pollutants are chemically reactive so using inert scalar as the tracer in pollutant
dispersion modelling would often overlook their impact on urban inhabitants. In this study,
large-eddy simulation (LES) is used to examine the plume dispersion of chemically reactive
pollutants in a hypothetical atmospheric boundary layer (ABL) in neutral stratification. The
irreversible chemistry mechanism of ozone (O3) titration is integrated into the LES model.
Nitric oxide (NO) is emitted from an elevated point source in a rectangular spatial
domain doped with O3. The LES results are compared well with the wind tunnel
results available in literature. Afterwards, the LES model is applied to idealized
two-dimensional (2D) street canyons of unity aspect ratio to study the behaviours of
chemically reactive plume over idealized urban roughness. The relation among
various time scales of reaction/turbulence and dimensionless number are analysed. |
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