| Item type |
デフォルトアイテムタイプ_（フル）(1) |
| 公開日 |
2023-03-18 |
| タイトル |
|
|
タイトル |
Unsteady Secondary Motion of Pulsatile Turbulent Flow through a Double 90°-Bend Duct |
|
言語 |
en |
| 作成者 |
Oki, Junichi
Kuga, Yukika
Yamamoto, Ryo
Nakamura, Kazuhiro
Yokohata, Hideaki
Nishida, Keiya
Ogata, Yoichi
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 権利情報 |
|
|
権利情報 |
This is a post-peer-review, pre-copyedit version of an article published in Flow, Turbulence and Combustion. The final authenticated version is available online at: https://doi.org/10.1007/s10494-019-00088-y. |
| 権利情報 |
|
|
権利情報 |
This is not the published version. Please cite only the published version. この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。 |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Turbulence |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Pulsatile flow |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Secondary flow |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Particle image velocimetry |
| 主題 |
|
|
主題Scheme |
Other |
|
主題 |
Swirl switching |
| 内容記述 |
|
|
内容記述 |
We investigate turbulent flow with highly pulsating axial velocity passing through a duct with both first and second bends. The time-dependent velocity fields downstream of the bends were measured using time-resolved stereo particle image velocimetry for the steady case (Reynolds number Re = 36,700) and the pulsatile case (Re = 37,800 and Womersley number α = 59.1). Proper orthogonal decomposition (POD) of the in-plane velocity data isolates the energetic structures of the secondary flow. The modes downstream of the first bend have a Dean motion (mode 0), single swirl (mode 1), and double swirl (mode 2), which agree with those of previous studies on steady turbulent flow. Downstream of the second bend, additional vortices appear in the modes owing to the secondary flow originating in the first bend. The modal structure of the pulsatile case is virtually the same as that of the steady case. To our knowledge, we are the first to find swirl switching in pulsatile flow, whereas the switching has been reported only for steady cases. We further conduct a time-frequency analysis via wavelet transformation onto the POD time coefficient, showing intermittency in energy of the mode associated with swirl switching. |
|
言語 |
en |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
This work was partially supported by a research grant from The Hiroshima University Education and Research Support Foundation. |
| 出版者 |
|
|
出版者 |
Springer |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
AO |
|
出版タイプResource |
http://purl.org/coar/version/c_b1a7d7d4d402bcce |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
10.1007/s10494-019-00088-y |
| 関連情報 |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1007/s10494-019-00088-y |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
1386-6184 |
| 収録物識別子 |
|
|
収録物識別子タイプ |
ISSN |
|
収録物識別子 |
1573-1987 |
| 開始ページ |
|
|
開始ページ |
817 |
| 書誌情報 |
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion
巻 104,
p. 817-833,
発行日 2020-04
|
| 旧ID |
51063 |
FlowTurbulComb_104_817.pdf (1.5 MB)
