A study on tubulence models for diffusion and absorption of contaminant and carbon dioxide within vegetation
| Project/Area Number |
17560531
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Architectural environment/equipment
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| Research Institution | Kyoto University |
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Principal Investigator |
HIRAOKA Hisashi Kyoto University, Academic Center for Computing and Media Studies, 准教授 (80115922)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,440,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥240,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2005: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | vegetation / LES / diffusion / turbulence model / contaminant / carbon dioxide / 流体工学 / モデル化 / 大気汚染・浄化 / シミュレーション工学 / 建築環境・設備 / 大気汚染防止・浄化 |
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| Research Abstract |
In this study, we proposed two kinds of turbulence models for diffusion and absarption oficontamioant and carbon dioxide within vegetation. One (k-ε) type model and the other is a LES(Large Eddy Simulation) model. In cam of (k-ε) model, we adopt the procedure where we took the ensemble avenges and then the spatial averages of the basic equations. A filter was adopted for the spatial average. We assumed that tie filter was sufficiently smooth, though it was top-hat type. The drag force due to pressure and strain was analytically derived from taking the ensemble-averaged Navier-Stokes equation. Moreover, the equations of turbulent energy and viscous dissipation rate were derived from the basic equations. The effects of vegetation on the equations of turbulent energy and viscous dissipation rate were modeled and the equations were closed The validation was tried by comparing the results from the model with the measured data. In case of LES model, we adopted the sufficiently smooth top-bat filter. Although Smagorinsky-type LES models are usually used, we adopted a one-equation LES model. Because the wake production term which appears in the subgrid-scale turbulence equation is not negligible. The one-equation LES model was validated by comparing the result of the model with the measured data.
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Report
(4 results)
Research Products
(23 results)
