| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2012: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2011: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2010: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
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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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