Clumps in drift wave turbulence

H. L. Pecseli, Torben Mikkelsen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In a statistical analysis pair correlation of particles is eventually destroyed by small scale fluctuations giving rise to relative particle diffusion. However, in any one given realization of the statistical ensemble particles may remain correlated in certain regions of space. A perfectly frozen, two-dimensional random flow serves as a particularly simple illustration. For this case particles can be trapped for all times in a local vortex (macro-clump). A small test-cloud of particles (micro-clump) chosen arbitrarily in a realization will on the other hand expand on average. A formulation is proposed in terms of conditional eddies, in order to discriminate turbulent flows where macro-clumps may be observed. The analysis is illustrated by results from experimental investigations of strongly turbulent, resistive drift-wave fluctuations. The related problem for electrostatic turbulence in unmagnetized plasma is also discussed.
    Original languageEnglish
    JournalPlasma Physics and Controlled Fusion
    Volume28
    Issue number7
    Pages (from-to)1025-1041
    ISSN0741-3335
    DOIs
    Publication statusPublished - 1986

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