Statistical properties of freely decaying two-dimensional hydrodynamic turbulence

A. N. Kudryavtsev, E. A. Kuznetsov, E. V. Sereshchenko

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    8 Citations (Scopus)

    Abstract

    Statistical characteristics of freely decaying two-dimensional hydrodynamic turbulence at high Reynolds numbers are numerically studied. In particular, numerical experiments (with resolution up to 8192 × 8192) provide a Kraichnan-type turbulence spectrum Ek ~ k-3. By means of spatial filtration, it is found that the main contribution to the spectrum comes from sharp vorticity gradients in the form of quasi-shocks. Such quasi-singularities are responsible for a strong angular dependence of the spectrum owing to well-localized (in terms of the angle) jets with minor and/or large overlapping. In each jet, the spectrum decreases as k-3. The behavior of the third-order structure function accurately agrees with the Kraichnan direct cascade concept corresponding to a constant enstrophy flux. It is shown that the power law exponents ξn for higher structure functions grow with n more slowly than the linear dependence, thus indicating turbulence intermittency.

    Original languageEnglish
    Pages (from-to)699-705
    Number of pages7
    JournalJETP Letters
    Volume96
    Issue number11
    DOIs
    Publication statusPublished - Feb 2013

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