title: Dynamic multiscaling in two-dimensional fluid turbulence.
abstract: We obtain, by extensive direct numerical simulations, time-dependent and equal-time structure functions for the vorticity, in both quasi-Lagrangian and Eulerian frames, for the direct-cascade regime in two-dimensional fluid turbulence with air-drag-induced friction. We show that different ways of extracting time scales from these time-dependent structure functions lead to different dynamic-multiscaling exponents, which are related to equal-time multiscaling exponents by different classes of bridge relations; for a representative value of the friction we verify that, given our error bars, these bridge relations hold.
authors: Laboratoire Cassiopée, Observatoire de la Côte d'Azur, UNS, CNRS, BP 4229, 06304 Nice Cedex 4, France. samriddhisankarray@gmail.com
authors: Samriddhi Sankar
authors: SS
authors: Ray
authors: Dhrubaditya
authors: D
authors: Mitra
authors: Prasad
authors: P
authors: Perlekar
authors: Rahul
authors: R
authors: Pandit