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Numerical simulation of the aα-effect and turbulent magnetic diffusion with molecular diffusivity

Published online by Cambridge University Press:  21 April 2006

I. T. Drummond  and
R. R. Morgan
I. T. Drummond
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, U.K.
R. R. Morgan
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW, U.K.
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Abstract

We extend the numerical methods of a previous paper to the study of the α-effect in a turbulent plasma. In the frozen-turbulence case the α-effect vanishes for zero molecular diffusivity. The value of α is, however, found to depend very sensitively on the molecular diffusivity. The same is true for the turbulent magnetic diffusivity β. The theoretical predictions of the first-order smoothing and the Markovian approximations are well satisfied in the appropriate limits, for both α and β.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 163 , February 1986 , pp. 425 - 438
Copyright
© 1986 Cambridge University Press

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References

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