Niigata Insitute of Technology >
10 学術雑誌論文 = Journal Article >
10 査読済論文 = Postprint >
|Title ||:||単体建物モデルを対象とした乱流モデル,乱流シュミット数の影響の検討 : CFDによる建物近傍の汚染質拡散の予測精度に関する研究 その1|
|Title alternative ||:||INFLUENCE OF TURBULENCE MODELS AND TURBULENT SCHMIDT NUMBER FOR AN ISOLATED BUILDING : Study on prediction accuracy of CFD applied to dispersion around buildings part 1|
|Authors ||:||富永, 禎秀|
|Issue Date ||:||Aug-2008 |
|Journal Title ||:||日本建築学会環境系論文集|
|Start Page ||:||991|
|End Page ||:||997|
|Abstract ||:||The prediction accuracy of the flow and dispersion around a cubic building with a flush stack located on the roof were examined using various k-ε models. Numerical results were compared with the wind tunnel data. The standard k-ε model provides inadequate results for concentration field, because the basic flow structure such as the reverse flow on the roof can not be reproduced with this model. However, the revised k-ε models considered provide concentrations in better agreement with the experimental data. It is also confirmed that the prediction accuracy of the velocity field strongly affects that of the concentration field. The general agreement with the experiment in the RNG case was the best among the turbulence models tested. For computations with various turbulent Schmidt numbers, Sc_t, the results using Sc_t=0.3 gave better agreement with the wind tunnel data than those using Sc_t=0.7 and 1.0. It was confirmed that the predicted concentrations by all CFD models were less diffusive than those of the experiment and the results were largely dependent on the value of turbulent Schmidt number.|
Turbulent Schmidt number
|Type Local ||:||Journal Article|
|Appears in Collections||:||10 査読済論文 = Postprint|
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