The three-dimensionalities of wall bounded MHD turbulence

Alban Pothérat, Rico Klein

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    Flows of electrically conducting fluids in an external magnetic field tend to become 2D. We show experimentally that in channels flows normal to the field and electrically forced through one of the channel walls, the intensity of turbulent fluctuations scales as Re when the flow is quasi-2D, Re2/3 when the flow is 3D but strong near both walls, and Re1/2 if it is mostly concentrated along one wall only. We also partly confirm the theoretical prediction of [5] that structures of transversal wavelength k become quasi-2D when they exceed a critical size k ∼ Nt1/2, where the true interaction parameter Nt represents the ratio of momentum diffusion by the Lorentz force to inertia for the large scales.

    Original languageEnglish
    Publication statusPublished - 2013
    Event14th European Turbulence Conference, ETC 2013 - Lyon, France
    Duration: 1 Sept 20134 Sept 2013
    Conference number: 14

    Conference

    Conference14th European Turbulence Conference, ETC 2013
    Country/TerritoryFrance
    CityLyon
    Period1/09/134/09/13

    ASJC Scopus subject areas

    • Acoustics and Ultrasonics
    • Astronomy and Astrophysics
    • Atmospheric Science
    • Geophysics

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