Dynamic Multiscaling in Two-dimensional Fluid Turbulence
  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 differ- ent 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. 
Samriddhi Sankar Ray (Observatoire de la Cote d'Azur), Dhrubaditya   Mitra (NORDITA), Prasad Perlekar (Eindhoven University ...
physics.flu-dyn nlin.CD