Numerical calculations of fast dynamos in smooth velocity fields with realistic diffusion

Details Numerical calculations of fast dynamos in smooth velocity fields with realistic diffusion Numerical calculations of fast dynamos in smooth velocity fields with realistic diffusion

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.356..691g&link_type=abstract

Nature (ISSN 0028-0836), vol. 356, no. 6371, April 23, 1992, p. 691-693. Research supported by Australian Research Council and S

Physics

Fluid Dynamics

100

Dynamo Theory, Fluid Dynamics, Interstellar Magnetic Fields, Magnetic Diffusion, Chaos, Interstellar Matter, Steady Flow, Three Dimensional Flow

Scientific paper

Numerical computations are presented for linear kinematic dynamos associated with periodic smooth flows, in a framework which explicitly includes diffusion. Time-varying flows which depend on two spatial coordinates yield convincing evidence of fast-dynamo behavior, where diffusion times are up to 10,000 times greater than turnover time. A 3D steady flow exhibits similar behavior; all these flows have large regions where particle paths are chaotic.

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