Nonuniversal features of forced two-dimensional turbulence in the energy range - art. no. 020203

We examine energy spectra, fluxes, and transfers of two-dimensional forced incompressible turbulence with linear drag in the energy range, and find ma rked departures from 5/3 law and the idea of locality. Any attempt to bring the system into the "ideal cascade state" would result either in spectral (bulge) or flux distortion. We corroborate this observation by DNS (spectra l code) and eddy-damped quasinormal Markovian simulations. We examine the e nergy peak wave number k(p), in terms of drag coefficient lambda, and energ y dissipation rate epsilon, and find a relation k(p) similar to C (lambda ( 3)/epsilon)(1/2) to hold with C approximate to 50, but only within a limite d range of parameters.