title: Universal profile of the vortex condensate in two-dimensional turbulence.
abstract: An inverse turbulent cascade in a restricted two-dimensional periodic domain creates a condensate-a pair of coherent system-size vortices. We perform extensive numerical simulations of this system and carry out theoretical analysis based on momentum and energy exchanges between the turbulence and the vortices. We show that the vortices have a universal internal structure independent of the type of small-scale dissipation, small-scale forcing, and boundary conditions. The theory predicts not only the vortex inner region profile, but also the amplitude, which both perfectly agree with the numerical data.
authors.affiliation: Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Jason
authors.initials: J
authors.lastname: Laurie
authors.affiliation: Dipartmento di Fisica and INFN, Università di Torino, via P. Giuria 1, 10125 Torino, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Boffetta
authors.affiliation: Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel and Institute for Information Transmission Problems, Moscow 127994, Russia.
authors.forename: Gregory
authors.initials: G
authors.lastname: Falkovich
authors.affiliation: Landau Institute for Theoretical Physics, Kosygina 2, Moscow 119334, Russia and Moscow Institute of Physics and Technology, Dolgoprudny, Moscow 141700, Russia.
authors.forename: Igor
authors.initials: I
authors.lastname: Kolokolov
authors.affiliation: Landau Institute for Theoretical Physics, Kosygina 2, Moscow 119334, Russia and Moscow Institute of Physics and Technology, Dolgoprudny, Moscow 141700, Russia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Lebedev