2012 Fiscal Year Final Research Report
LES study of instantaneous flow structure and ventilation mechanism within an urban canopy layer
| Project/Area Number |
23760454
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Hydraulic engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
INAGAKI Atsushi 東京工業大学, 大学院・理工学研究科, 助教 (80515180)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 水理学 / 都市気象学 |
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| Research Abstract |
Instantaneous flow structure within a cubical canopy was investigated using large eddy simulation (LES). It was designed to simulate the convective boundary layer with flow around the cubical roughness with preserving a similarity law for both the convective mixed layer and the surface layer. The numerical result revealed that there are very large coherent structures of both in velocity and temperature fields within the canopy layer. The size of the structures is much larger than that of the cubes. It was also found that the shapes and locations of these structures are closely related with the TOS above. The upward momentum and heat transport events were clearly related with the TOS developed in the inertial sublayer more than the roughness geometry. Meanwhile, the downward transports are not so correlated with the TOS above but more regulated by the structure of canopy.
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