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- Title
Three-dimensional vortex structures under breaking waves.
- Authors
YASUNORI WATANABE; HIROSHI SAEKI; ROGER J. HOSKING
- 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.
- Publication
Journal of Fluid Mechanics, 2005, Vol 545, Issue 1, p291
- ISSN
0022-1120
- Publication type
Article
- DOI
10.1017/S0022112005006774