LES ANALYSIS ON ATMOSPHERIC DISPERSION IN SPATIALLY-DEVELOPING TURBULENT BOUNDARY LAYER IN ACTUAL URBAN AREA

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  • TAMURA Tetsuro
    Dept. of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • NAKAYAMA Hiromasa
    Dept. of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology(Currently)Environment Simulation Inc.
  • OKUDA Yasuo
    Dept. of Structural Engineering, Building Research Institute

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  • 実在都市における空間発達型境界層乱流中の大気拡散に関するLES解析
  • ジツザイ トシ ニ オケル クウカン ハッタツガタ キョウカイソウ ランリュウ チュウ ノ タイキ カクサン ニ カンスル LES カイセキ

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Abstract

Large-eddy simulation is applied to the problem of atmospheric dispersion inside urban area for oncoming turbulence, which is time-sequentially generated by unsteady numerical simulation of spatially-developing boundary layer in the driver unit as another computational domain. The present numerical model is validated in comparison with the previous field experimental results for plume dispersion through regular arrays of roughness blocks. We investigate the characteristics of flow and plume dispersion in actual urban area and occurrence of peak-to-r.m.s. concentrations based on various kinds of surface roughness for safety analysis. Obtained results are as follows; 1) The patterns of spatial distribution of mean concentration in actual urban area is very different from those in regular arrays of roughness blocks. 2) Fluctuating concentrations in actual urban area have special features, which can not be explained by the physical mechanism of the dispersion process obtained in regular arrays of roughness blocks.

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