STUDY OF GRADIENT DIFFUSION APPROXIMATION OF REYNOLDS STRESS WITHIN AND ABOVE AN URBAN CANYON USING LES DATABASE

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  • NAKAJIMA Keigo
    Grad. Stud., Dept. of Architecture, Faculty of Eng., The Univ. of Tokyo, M. Eng. /JSPS Research Fellow
  • OOKA Ryozo
    Prof., I.I.S., The Univ. of Tokyo, Ph.D.
  • KIKUMOTO Hideki
    Research Assoc., I.I.S., The Univ. of Tokyo, Ph.D.

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Other Title
  • LESデータベースを用いた都市キャニオン内外におけるレイノルズストレスの勾配拡散近似に関する検討
  • LES データベース オ モチイタ トシ キャニオン ナイガイ ニ オケル レイノルズストレス ノ コウバイ カクサン キンジ ニ カンスル ケントウ

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Abstract

 In this study, large-eddy simulation (LES) is performed to create the LES database to investigate the validity of the gradient diffusion approximation of the Reynolds stress within and above the urban canyon. It is confirmed that the LES database is more reliable than standard k-ε model (k-ε) within and above the urban canyon by comparing with the result of the wind tunnel experiment. k-ε fails to reproduce the spatial distribution of mean wind velocity within the urban canyon. The budget of Reynolds stress (<u1'u3'>) transport equation is analyzed using the LES database to investigate the validity of the gradient diffusion approximation. Within the urban canyon, the diffusion term of <u1'u3'> transport equation increases. The gradient diffusion approximation of <u1'u3'> is not valid within the urban canyon because the nonlocal effect of the diffusion term increases.

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