VALIDITY EVALUATION OF TURBULENT FLUX MODELING IN STANDARD K-ε MODEL WITHIN AND ABOVE URBAN CANYON UNDER VARIOUS CONDITIONS OF THERMAL STRATIFICATION USING LES

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  • LESを用いた温度成層下の都市キャニオンにおける標準k-εモデルの乱流フラックスモデリングの妥当性評価
  • LES オ モチイタ オンド セイソウ カ ノ トシ キャニオン ニ オケル ヒョウジュン k-eモデル ノ ランリュウ フラックスモデリング ノ ダトウセイ ヒョウカ

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In this study, the large-eddy simulation (LES) was conducted to investigate the validity of the Reynolds stress <u1’u3’> and turbulent heat flux <u3’T’> modeling within and above the urban canyon under various conditions of thermal stratification. The standard k-ε model (k-ε model) failed to reproduce the spatial distribution of the mean wind velocity vector and temperature within the urban canyon as the thermal stratification became unstable. It underestimated the absolute value of the <u1’u3’> and <u3’T’> compared with the LES. From the results of the LES, it was revealed that the production terms of the <u3’T’> by the mean wind velocity gradient P3T(2) and buoyancy effect G3T increased within the urban canyon. The G3T was also increased above the urban canyon, although the P3T(2) was almost negligible. In the modeling of the <u3’T’> of the k-ε model, these terms are neglected. It is necessary to incorporate the effects of the P3T(2) and G3T in the modeling of the <u3’T’> for the urban canyon flow under thermal stratification.

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