2012 Fiscal Year Final Research Report
Analysis and modeling on thermal and aero-dynamical forcing effect brought by urban canopy.
| Project/Area Number |
22360238
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | Kyushu University |
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Principal Investigator |
TANIMOTO Jun 九州大学, 総合理工学研究院, 教授 (60227238)
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| Co-Investigator(Kenkyū-buntansha) |
HAGISHIMA Aya 九州大学, 総合理工学研究院, 准教授 (60294980)
NARITA Ken-ichi 日本工業大学, 工学部, 教授 (20189210)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 都市キャノピー / 風洞実験 / バルク運動量輸送係数 / バルクスカラー輸送係数 |
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| Research Abstract |
The complete set of elaborated direct measurement systems for both drag force acting on a building blocks area and scalar flux transfer from urban canopies, which we developed in the previous project, systematic and comprehensive wind tunnel experiments to identify the so-called Bulk Drag (Momentum) Transferring Coefficient & Bulk Drag Scalar Transferring Coefficient for various urban geometric contexts were carried out. We identified a good first-step inception to get somehow universal relations of both two bulk transferring coefficients with urban geometry as long as we choose appropriate parameters. We grasped that not only building density but also slenderness of each building blocks as well as height variation, array randomness are crucially affecting on the transferring coefficients through turbulent structure brought by urban canopies. We also took other methodologies than the wind experiment; PIV technique and CFD that make sure to investigate what is really happening in and just-above urban canopies in terms of turbulent structure. LES, one of up-most CFD techniques, reveals that TOS (turbulent organized structure) emerged above canopies in connection with dynamics within canopies significantly affects onthe thermal and aero-dynamical forcing effect.
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Research Products
(31 results)
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[Journal Article] Geometric Dependence of the Scalar Transfer Efficiency over Rough Surfaces2012
Author(s)
Ikegaya,N., Hagishima,A., Tanimoto,J., Tanaka,Y., Narita,K., Sheikh Ahmad,Z.
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Journal Title
Boundary-Layer Metrology 142 (2)
Pages: 357-377
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[Presentation] A study on the similarity between the scalar and momentum roughness lengths based on the scalar concentration measurement2012
Author(s)
Izual,N.I., Ikegaya,N., Hagishima,A., Tanimoto,J., Chung,J.
Organizer
Asia Conference of International Building Performance Simulation Association
Place of Presentation
Shanghai, China
Year and Date
2012-11-26
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