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Turbulent dynamos driven by convection

Published online by Cambridge University Press:  26 April 2006

M. Meneguzzi  and
A. Pouquet
M. Meneguzzi
Affiliation:
CERFACS, 42 avenue Coriolis, 31000 Toulouse and Service d'Astrophysique, Centre d'Etudes Nucléaires de Saclay, France
A. Pouquet
Affiliation:
High Altitude Observatory, NCAR, Boulder, CO 80307, USA and LA 128, CNRS, Observatoire de Nice, BP 139, 06007 Nice, France
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Abstract

The generation of magnetic fields by the turbulent motions of a conducting fluid driven by thermal convection in the incompressible case is studied by direct numerical simulations at Rayleigh numbers up to 200 times critical and Prandtl numbers 0.2 and 1. Our results are consistent with a dynamo effect which occurs for magnetic Reynolds numbers above a few tens, in the presence of, as well as in the absence of, rotation around the vertical axis. In all cases, the magnetic field is more intermittent than the velocity field.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 205 , August 1989 , pp. 297 - 318
Copyright
© 1989 Cambridge University Press

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