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  1. 防災科研関係論文

The flow structure in the wake of a fractal fence and the absence of an "inertial regime"

https://nied-repo.bosai.go.jp/records/4186
https://nied-repo.bosai.go.jp/records/4186
d6136536-ec1e-457d-b1d2-4c1ab1f347a6
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル The flow structure in the wake of a fractal fence and the absence of an "inertial regime"
言語
言語 eng
著者 C. J. Keylock

× C. J. Keylock

en C. J. Keylock

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K. Nishimura

× K. Nishimura

en K. Nishimura

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M. Nemoto

× M. Nemoto

en M. Nemoto

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Y. Ito

× Y. Ito

en Y. Ito

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抄録
内容記述タイプ Other
内容記述 Recent theoretical work has highlighted the importance of multi-scale forcing of the flow for altering the nature of turbulence energy transfer and dissipation. In particular, fractal types of forcing have been studied. This is potentially of real significance in environmental fluid mechanics where multi-scale forcing is perhaps more common than the excitation of a specific mode. In this paper we report the first results studying the detail of the wake structure behind fences in a boundary layer where, for a constant porosity, we vary the average spacing of the struts and also introduce fractal fences. As expected, to first order, and in the far-wake region, in particular, the response of the fences is governed by their porosity. However, we show that there are some significant differences in the detail of the turbulent structure between the fractal and non-fractal fences and that these override differences in porosity. In the near wake, the structure of the fence dominates porosity effects and a modified wake interaction length seems to have potential for collapsing the data. With regards to the intermittency of the velocities, the fractal fences behave more similarly to homogeneous, isotropic turbulence. In addition, there is a high amount of dissipation for the fractal fences over scales that, based on the energy spectrum, should be dominated by inter-scale transfers. This latter result is consistent with numerical simulations of flow forced at multiple scales and shows that what appears to be an "inertial regime" cannot be as production and dissipation are both high. © 2012 Springer Science+Business Media B.V.
言語 en
書誌情報 en : Environmental Fluid Mechanics

巻 12, 号 3, p. 227-250
ISSN
収録物識別子タイプ ISSN
収録物識別子 1567-7419
DOI
関連識別子 10.1007/s10652-011-9233-0
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