Coherent vortices and tracer cascades in two-dimensional turbulence (Articolo in rivista)

Type
Label
  • Coherent vortices and tracer cascades in two-dimensional turbulence (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Babiano A, Provenzale A (2007)
    Coherent vortices and tracer cascades in two-dimensional turbulence
    in Journal of fluid mechanics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Babiano A, Provenzale A (literal)
Pagina inizio
  • 429 (literal)
Pagina fine
  • 448 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 574 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Coherent vortices and tracer cascades in two-dimensional turbulence (literal)
Abstract
  • We study numerically the scale-to-scale transfers of enstrophy and passive-tracer variance in two-dimensional turbulence, and show that these transfers display significant differences in the inertial range of the enstrophy cascade. While passive-tracer variance always cascades towards small scales, enstrophy is characterized by the simultaneous presence of a direct cascade in hyperbolic regions and of an inverse cascade in elliptic regions. The inverse enstrophy cascade is particularly intense in clusters of small-scales elliptic patches and vorticity filaments in the turbulent background, and it is associated with gradient-decreasing processes. The inversion of the enstrophy cascade, already noticed by Ohkitani (Phys. Fluids A, vol. 3, 1991, p. 1598), appears to be the main difference between vorticity and passive-tracer dynamics in incompressible two-dimensional turbulence. (literal)
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