Influence of Friction on the Direct Cascade of the 2d Forced Turbulence

Details Influence of Friction on the Direct Cascade of the 2d Forced Turbulence Influence of Friction on the Direct Cascade of the 2d Forced Turbulence

1999-04-20

arxiv.org/abs/chao-dyn/9904034v3

Physics

Condensed Matter

LaTeX, 6 pages, new version, content and form completely rewritten with large modifications, to be published in Europhyscis Le

Scientific paper

10.1209/epl/i2000-00275-y

We discuss two possible scenario for the direct cascade in two dimensional turbulent systems in presence of friction which differ by the presence or not of enstrophy dissipation in the inviscid limit.They are distinguished by the existence or not of a constant enstrophy transfer and by the presence of leading anomalous scaling in the velocity three point functions. We also point out that the velocity statistics become gaussian in the approximation consisting in neglecting odd order correlations in front even order ones.

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