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Mach number dependence of the onset of dynamo action

Lookup NU author(s): Professor Axel Brandenburg, Mr AJW William Mee

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Abstract

The effect of compressibility on the onset of non-helical turbulent dynamo action is investigated using both direct simulations as well as simulations with shock-capturing viscosities, keeping, however, the regular magnetic diffusivity. It is found that the critical magnetic Reynolds number increases from about 35 in the subsonic regime to about 70 in the supersonic regime. Although the shock structures are sharper in the high-resolution direct simulations compared with the low-resolution shock-capturing simulations, the magnetic field looks roughly similar in both cases and does not show any shock structures. Similarly, the onset of dynamo action is not significantly affected by the shock-capturing viscosity.

Publication metadata

Author(s): Haugen NEL, Brandenburg A, Mee AJ

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2004

Volume: 353

Issue: 3

Pages: 947-952

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1111/j.1365-2966.2004.08127.x

DOI: 10.1111/j.1365-2966.2004.08127.x

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