期刊
ATMOSPHERIC ENVIRONMENT
卷 75, 期 -, 页码 153-162出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2013.04.017
关键词
Atmospheric dispersion; Large-eddy simulation; Meteorological influence; Urban district; Field measurement
资金
- Japan Society for the Promotion of Science (JSPS), JSPS KAKENHI [25820289]
- Grants-in-Aid for Scientific Research [25820289] Funding Source: KAKEN
A microscale large-eddy simulation (LES) model coupled to a mesoscale LES model is implemented to estimate a ground concentration considering the meteorological influence in an actual urban district. The microscale LES model is based on a finite volume method with an unstructured grid system to resolve the flow structure in a complex geometry. The Advanced Regional Prediction System (ARPS) is used for mesoscale meteorological simulation. To evaluate the performance of the LES model, 1-h averaged concentrations are compared with those obtained by field measurements, which were conducted for tracer gas dispersion from a point source on the roof of a tall building in Tokyo. The concentrations obtained by the LES model without combing the mesoscale LES model are in quite good agreement with the wind-tunnel experimental data, but overestimates the 1-h averaged ground concentration in the field measurements. On the other hand, the ground concentrations using the microscale LES model coupled to the mesoscale LES are widely distributed owing to large-scale turbulent motions generated by the mesoscale LES, and the concentrations are nearly equal to the concentrations from the field measurements. (C) 2013 Elsevier Ltd. All rights reserved.
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