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Quantitative visualization of vortex ring structure during wall impingement subject to background rotation

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/79358

Title: Quantitative visualization of vortex ring structure during wall impingement subject to background rotation
Authors: Oishi, Yoshihiko Browse this author
Murai, Yuichi Browse this author →KAKEN DB
Tasaka, Yuji Browse this author →KAKEN DB
Keywords: Vortex ring
Rotating flow
Impingement
PTV
3D vortex structure
Issue Date: Oct-2019
Publisher: Springer
Journal Title: Journal of visualization
Volume: 22
Issue: 5
Start Page: 867
End Page: 876
Publisher DOI: 10.1007/s12650-019-00575-4
Abstract: A single vortex ring subject to background rotation in the process of wall impingement has been experimentally investigated by particle tracking velocimetry (PTV). Two parameter conditions of Reynolds and Rossby numbers were chosen in addition to stationary environment as much strong and competitive Coriolis force emerges in comparison with inertia induced by vortex rings. From horizontal PTV windows set on the rotating experimental frame above the bottom wall, comprehensive influences of Coriolis force on the wall-impinging reaction are visualized as space-time three-dimensional vorticity distributions. Against natural growth of azimuthal waves due to Widnall instability, wall-impinging suppresses the waves and rather re-organizes original primary vortex because of cyclonic swirl coherently induced during impingement. This resists to turbulent collapse of vortex ring during the impingement and self-boosts own life time. We try to explain the mechanism of such an anti-decaying process in the final part, untangling the phenomenon with best read from the space-time correlations among three vorticity components.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Journal of visualization. The final authenticated version is available online at: http://dx.doi.org/10.1007/s12650-019-00575-4.
Type: article (author version)
URI: http://hdl.handle.net/2115/79358
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田坂 裕司

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