Linear and nonlinear decay of cat's eyes in two-dimensional vortices, and the link to Landau poles

M.R. Turner, A.D. Gilbert

Research output: Contribution to journalArticle

Abstract

This paper considers the evolution of smooth, two-dimensional vortices subject to a rotating external strain field, which generates regions of recirculating, cat's eye stream line topology within a vortex. When the external strain field is smoothly switched off, the cat's eyes may persist, or they may disappear as the vortex relaxes back to axisymmetry. A numerical study obtains criteria for the persistence of cat's eyes as a function of the strength and time-scale of the imposed strain field, for a Gaussian vortex profile. In the limit of a weak external strain field and high Reynolds number, the disturbance decays exponentially, with a rate that is linked to a Landau pole of the linear inviscid problem. For stronger strain fields, but not strong enough to give persistent cat's eyes, the exponential decay of the disturbance varies: as time increases the decay slows down, because of the nonlinear feedback on the mean profile of the vortex. This is confirmed by determining the decay rate given by the Landau pole for these modified profiles. For strain fields strong enough to generate persistent cat's eyes, their location and rotation rate are determined for a range of angular velocities of the external strain field, and are again linked to Landau poles of the mean profiles, modified through nonlinear effects.
Original languageEnglish
Pages (from-to)255-279
Number of pages25
JournalJournal of Fluid Mechanics
Volume593
DOIs
Publication statusPublished - 2007

Bibliographical note

© 2007 Cambridge University Press

Fingerprint Dive into the research topics of 'Linear and nonlinear decay of cat's eyes in two-dimensional vortices, and the link to Landau poles'. Together they form a unique fingerprint.

  • Cite this