Publication Date:
2002
abstract:
We study the statistics of the vorticity field in two-dimensional
Navier-Stokes turbulence with linear Ekman friction. We show that the
small-scale vorticity fluctuations are intermittent, as conjectured by D.
Bernard, [{\it Europhys. Lett.} {\bf 50} (2000) 333] and Nam {\it et al.\/}
[{\it Phys. Rev. Lett.\/} {\bf 84} (2000) 5134]. The small-scale statistics
of vorticity fluctuations coincides with the one of a passive scalar with
finite lifetime transported by the velocity field itself.
Iris type:
01.01 Articolo in rivista