Guseva, A., Hollerbach, R., Willis, A.P. orcid.org/0000-0002-2693-2952 et al. (1 more author) (2017) Dynamo action in a quasi-Keplarian Taylor-Couette flow. Physical Review Letters, 119. 164501. ISSN 0031-9007
Abstract
We numerically compute the flow of an electrically conducting fluid in a Taylor-Couette geometry where the rotation rates of the inner and outer cylinders satisfy Ω_o /Ω_i = (r_o /r_ i )^{ −3/2} . In this quasi-Keplerian regime a non-magnetic system would be Rayleigh-stable for all Reynolds numbers Re, and the resulting purely azimuthal flow incapable of kinematic dynamo action for all magnetic Reynolds numbers Rm. For Re = 10^4 and Rm = 10^5 we demonstrate the existence of a finite-amplitude dynamo, whereby a suitable initial condition yields mutually sustaining turbulence and magnetic fields, even though neither could exist without the other. This dynamo solution results in significantly increased outward angular momentum transport, with the bulk of the transport being by Maxwell rather than Reynolds stresses.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 American Physical Society. Reproduced in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Oct 2017 15:12 |
Last Modified: | 29 Apr 2019 13:15 |
Published Version: | https://doi.org/10.1103/PhysRevLett.119.164501 |
Status: | Published |
Publisher: | American Physical Society |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevLett.119.164501 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:121606 |