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URN: urn:nbn:de:kobv:517-opus-14317
URL: http://opus.kobv.de/ubp/volltexte/2007/1431/

Feudel, Fred ; Seehafer, Norbert ; Galanti, Barak ; Rüdiger, Sten

Symmetry breaking bifurcations for the magnetohydrodynamic equations with helical forcing

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Kurzfassung auf Englisch

We have studied the bifurcations in a three-dimensional incompressible magnetofluid with periodic boundary conditions and an external forcing of the Arnold-Beltrami-Childress (ABC) type. Bifurcation-analysis techniques have been applied to explore the qualitative behavior of solution branches. Due to the symmetry of the forcing, the equations are equivariant with respect to a group of transformations isomorphic to the octahedral group, and we have paid special attention to symmetry-breaking effects. As the Reynolds number is increased, the primary nonmagnetic steady state, the ABC flow, loses its stability to a periodic magnetic state, showing the appearance of a generic dynamo effect; the critical value of the Reynolds number for the instability of the ABC flow is decreased compared to the purely hydrodynamic case. The bifurcating magnetic branch in turn is subject to secondary, symmetry-breaking bifurcations. We have traced periodic and quasi- periodic branches until they end up in chaotic states. In particular detail we have analyzed the subgroup symmetries of the bifurcating periodic branches, which are closely related to the spatial structure of the magnetic field.

PACS - Klassifikation 47.20.Ky , 47.65.+a , 47.27.Cn , 95.30.Qd
Institut 1: Institut für Physik und Astronomie
Institut 2: Interdisziplinäres Zentrum Dynamik komplexer Systeme
DDC-Sachgruppe: Physik
Dokumentart: c Preprint (Vorabdruck)
Schriftenreihe: NLD Preprints
Band Nummer: paper 031
Sprache: Englisch
Erstellungsjahr: 1996
Publikationsdatum: 20.06.2007

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