title: Intermittency in two-dimensional Ekman-Navier-Stokes turbulence.
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 Bernard [Europhys. Lett. 50, 333 (2000)] and Nam et al. [Phys. Rev. Lett. 84, 5134 (2000)]. The small-scale statistics of vorticity fluctuations coincide with that of a passive scalar with finite lifetime transported by the velocity field itself.
authors.affiliation: Dipartimento di Fisica Generale, Università di Torino, Via Pietro Giuria 1, 10125 Torino, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Boffetta
authors.forename: A
authors.initials: A
authors.lastname: Celani
authors.forename: S
authors.initials: S
authors.lastname: Musacchio
authors.forename: M
authors.initials: M
authors.lastname: Vergassola