期刊
PHYSICS LETTERS A
卷 372, 期 33, 页码 5452-5457出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2008.06.038
关键词
vortex dynamics; rotating fluids; topography interaction; quasi-geostrophic
资金
- NSF Division of Ocean Sciences
- ONR Ocean Science Division
- Universite de Bretagne Occidentale (Brest, France)
- French Ministry of Research
- INTAS [04-80-7297]
The evolution of a self-propelling vortex dipole, embedded in an external nondivergent flow with constant potential vorticity, is Studied in an equivalent-barotropic model commonly used in geophysical, astrophysical and plasma studies. In addition to the conservation of the Hamiltonian for an arbitrary point vortex dipole, it is found that the angular momentum is also conserved when the external flow is axisymmetric. This reduces the original four degrees of freedom to only two, so that the solution is expressed in quadratures. In particular, the scattering of antisymmetric dipoles approaching from the infinity is analyzed in the presence of an axisymmetric oceanic flow typical for the vicinity of isolated seamounts. (C) 2008 Elsevier B.V. All rights reserved.
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