期刊
GEOPHYSICAL AND ASTROPHYSICAL FLUID DYNAMICS
卷 97, 期 2, 页码 149-174出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/0309192031000119740
关键词
nonlinear magnetic dynamo; bifurcations; reversals
We are investigating numerically the nonlinear behaviour of a space-periodic MHD system with ABC forcing. Most computations are performed for magnetic Reynolds numbers increasing from 0 to 60 and a fixed kinematic Reynolds number, small enough for the trivial solution with a zero magnetic field to be stable to velocity perturbations. At the critical magnetic Reynolds number for the onset of instability of the trivial solution the dominant eigenvalue of the kinematic dynamo problem is,real. In agreement with the bifurcation theory new steady states with non-vanishing magnetic field appear in this bifurcation. Subsequent bifurcations are investigated. A regime is detected, where chaotic variations of the magnetic field orientation (analogous to magnetic field reversals) are observed in the temporal evolution of the system.
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