| アイテムタイプ |
itemtype_ver1(1) |
| 公開日 |
2025-05-21 |
| タイトル |
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タイトル |
Unsteady flow field behind levitated short-finite circular cylinder with angle of attack |
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言語 |
en |
| 著者 |
Yokota, Sho
Nagata, Takayuki
Nonomura, Taku
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| アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利 |
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権利情報 |
This article has been published in a revised form in [Journal of Fluid Mechanics] [http://doi.org/10.1017/jfm.2024.1178]. This version is free to view and download for private research and study only. Not for re-distribution or re-use. © The Author(s), 2025. Published by Cambridge University Press. |
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言語 |
en |
| 内容記述 |
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内容記述タイプ |
Abstract |
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内容記述 |
Flow field in the near wake of a short-finite circular cylinder at L/D=1.0 with an angle of attack between 0∘–15∘, where the transition from the non-reattaching flow to the reattaching flow appears, is investigated in wind tunnel tests with a supportless condition. Stereo particle image velocimetry measurements were applied to the experiments at the Reynolds number of 3.46×10^4, and velocity fields in the near wake were obtained. The data was mainly analysed using spectral proper orthogonal decomposition. Characteristic large-scale wake structures of recirculation bubble pumping and large-scale vortex shedding were identified in the near wake of the cylinder regardless of the angle of attack. The phase difference of expansion and contraction of the recirculation flow appears in the recirculation bubble pumping at α≠0∘. On the other hand, the eigenfunctions of velocity fluctuations at the vortex shedding frequency show a similar spatial pattern regardless of α. Frequency analyses of wake position calculated from the reconstructed velocity field clarified that peak frequency is different between two in-plane directions when α≠0∘. In addition, three vortex shedding patterns (anticlockwise/clockwise circular and flapping) are identified not only at α=0∘ but also α≠0∘. The feature of wake position in the radial direction for each pattern is observed regardless of the angle of attack. The relationship between the recirculation bubble pumping and the wake position in the radial direction is apparent in the non-reattaching flow but is weaker with α in the reattaching flow. |
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言語 |
en |
| 出版者 |
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出版者 |
Cambridge University Press |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプresource |
http://purl.org/coar/resource_type/c_6501 |
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タイプ |
journal article |
| 出版タイプ |
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出版タイプ |
AM |
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出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| 関連情報 |
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|
関連タイプ |
isVersionOf |
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|
識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1017/jfm.2024.1178 |
| 収録物識別子 |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
0022-1120 |
| 書誌情報 |
en : Journal of Fluid Mechanics
巻 1002,
p. A47,
発行日 2025-01-09
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| ファイル公開日 |
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日付 |
2025-07-10 |
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日付タイプ |
Available |
yokota2025unsteady.pdf (10 MB)
