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Three-dimensional vortex structures under breaking waves

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Title: Three-dimensional vortex structures under breaking waves
Authors: Watanabe, Yasunori1 Browse this author →KAKEN DB
Saeki, Hiroshi Browse this author
Hosking, Roger J. Browse this author
Authors(alt): 渡部, 靖憲1
Issue Date: 2005
Publisher: Cambridge University Press
Journal Title: Journal of Fluid Mechanics
Volume: 545
Start Page: 291
End Page: 328
Publisher DOI: 10.1017/S0022112005006774
Abstract: The large-scale vortex structures under spilling and plunging breakers are investigated, using a fully three-dimensional large-eddy simulation (LES). When an overturning jet projecting from the crest in a breaking wave rebounds from the water surface ahead, the vorticity becomes unstable in a saddle region of strain between the rebounding jet and a primary spanwise vortex, resulting in spanwise undulations of the vorticity. The undulations are amplified on a braid in this saddle region, leading to a vortex loop with counter-rotating vorticity. This vortex loop consequently envelops adjacent primary vortices, to form a typical rib structure. This rib component (the stretched vortex loop) in the large-scale vortex structure, which intensifies in the strains associated with the multiple primary vortices generated throughout the splash-up cycle, appears to be the previously found obliquely descending eddy.
Rights: Copyright © 2005 Cambridge University Press
Type: article
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: 渡部 靖憲

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