Some unusual properties of turbulent convection and dynamos in rotating spherical shells

Busse, F.H. and Simitev, R.D. (2010) Some unusual properties of turbulent convection and dynamos in rotating spherical shells. In: Dritschel, D. (ed.) IUTAM Symposium on Turbulence in the Atmosphere and Oceans: Proceedings of the IUTAM Symposium on Turbulence in the Atmosphere and Oceans, Cambridge, UK, December 8-12, 2008. Series: IUTAM bookseries (28). Springer: Dordrecht, The Netherlands, pp. 181-194. ISBN 9789400703599 (doi:10.1007/978-94-007-0360-5_15)

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Publisher's URL: http://dx.doi.org/10.1007/978-94-007-0360-5_15

Abstract

The dynamics of convecting fluids in rotating spherical shells is governed at Prandtl numbers of the order unity by the interaction between differential rotation and roll-like convection eddies. While the differential rotation is driven by the Reynolds stresses of the eddies, its shearing action inhibits convection and causes phenomena such as localized convection and turbulent relaxation oscillations. The response of the system is enriched in the case of dynamo action. Lorentz forces may brake either entirely or partially the geostrophic differential rotation and give rise to two rather different dynamo states. Bistability of turbulent dynamos exists for magnetic Prandtl numbers of the order unity. While the ratios between mean magnetic and kinetic energies differ by a factor of 5 or more for the two dynamo states, the mean convective heat transports are nearly the same. They are much larger than in the absence of a magnetic field.

Item Type:Book Sections
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Busse, F.H., and Simitev, R.D.
Subjects:Q Science > QA Mathematics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Publisher:Springer
ISBN:9789400703599

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