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Point vortex dynamics within a background vorticity patch
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DOI：10.1063/1.1343484.png)
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Abstract
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Recent experiments and simulations have observed that the interaction of strong vortices with a low vorticity background can strongly affect the dynamics of both vortices and background. This paper considers an idealized model of this interaction. The background is treated as a patch of uniform vorticity with a nearly circular shape. The strong vortices are treated as point vortices, and their total circulation lambda is assumed to be small compared to that of the background. It is found that Kelvin waves on the boundary of the background patch can be driven to large amplitude by the strong vortices, eventually resulting in wave breaking and filamentation. A multiscale analysis finds that the wave-breaking time scales as lambda (-1) ln lambda (-1), in agreement with contour dynamics simulations. (C) 2001 American Institute of Physics.
Keywords:
GREAT RED SPOT
DECAYING TURBULENCE
CONTOUR DYNAMICS
SIMULATION
RELAXATION
CRYSTALS
ENTROPY
MOTION
FLOW
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