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Three-dimensional vortex structures under breaking waves
| 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 |
| URI: | http://hdl.handle.net/2115/1425 |
| 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)
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Submitter: 渡部 靖憲
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