Formation of magnetic flux tubes in cylindrical wedge geometry

Botha, Gert, Rucklidge, Alistair and Hurlburt, Neal (2012) Formation of magnetic flux tubes in cylindrical wedge geometry. Geophysical and Astrophysical Fluid Dynamics, 106 (6). pp. 701-709. ISSN 1029-0419

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Official URL: http://dx.doi.org/10.1080/03091929.2011.643236

Abstract

Three-dimensional (3D) MHD numerical simulations have not been able to demonstrate convincingly the spontaneous formation of large vertical flux tubes. Two-dimensional (2D) magnetoconvection in axisymmetric cylinders forms a central magnetic flux tube surrounded by annular convection rings. To study the robustness of this type of solution in three dimensions, the nonlinear resistive MHD equations are solved numerically in a 3D cylindrical wedge from an initially uniform vertical magnetic field. It is shown that the 2D result is retrieved for small domain radii. However, for larger radii the central axis loses its importance and in this case many convection cells form in the numerical domain. Magnetic flux is captured between cells where flow converges and the reduced amount of flux that congregates at the central axis is eroded by the surrounding convection.

Item Type: Article
Uncontrolled Keywords: Magnetoconvection, Turbulent erosion, Flux separation, Numerical solution
Subjects: F300 Physics
F500 Astronomy
G900 Others in Mathematical and Computing Sciences
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Gert Botha
Date Deposited: 22 Jun 2015 10:59
Last Modified: 17 May 2017 18:14
URI: http://nrl.northumbria.ac.uk/id/eprint/23000

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