Appearance of Three Dimensionality in Wall-Bounded MHD Flows

Details Appearance of Three Dimensionality in Wall-Bounded MHD Flows Appearance of Three Dimensionality in Wall-Bounded MHD Flows

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvl.104c4502k&link_type=abstract

Physical Review Letters, vol. 104, Issue 3, id. 034502

Astronomy and Astrophysics

Astrophysics

5

Magnetohydrodynamics And Electrohydrodynamics, Transition To Turbulence, Vortex Stability And Breakdown

Scientific paper

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.

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