Appearance of three dimensionality in wall-bounded MHD flows

R. Klein, Alban Potherat

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    33 Citations (Scopus)
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    Abstract

    We characterize experimentally how three dimensionality appears in wall-bounded magnetohydrodynamic flows. Our analysis of the breakdown of a square array of vortices in a cubic container singles out two mechanisms: first, a form of three dimensionality we call weak appears through differential rotation in individual 2D vortices. Second, strong three dimensionality characterized by vortex disruption leads on the one hand to a remarkable vortex array that is both steady and 3D, and, on the other hand, to scale-selective breakdown of two dimensionality in chaotic flows. Most importantly, these phenomena are entirely driven by inertia, so they are relevant to other flows with a tendency to two dimensionality, such as rotating, or stratified flows in geophysics and astrophysics.
    Original languageEnglish
    Article number034502
    JournalPhysical Review Letters
    Volume104
    Issue number3
    DOIs
    Publication statusPublished - Jan 2010

    Bibliographical note

    © 2010 American Physical Society

    Keywords

    • three dimensionality
    • wall-bounded magnetohydrodynamic flows
    • vortices

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