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Cross-helically forced and decaying hydromagnetic turbulence
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA; Carnegie Mellon University, USA; University of Waikato, New Zealand.
Number of Authors: 22018 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 339, no 9-10, p. 641-646Article in journal (Refereed) Published
Abstract [en]

We study the evolution of kinetic and magnetic energy spectra in magnetohydrodynamic flows in the presence of strong cross helicity. For forced turbulence, we find a weak inverse transfer of kinetic energy toward the smallest wavenumber. This is plausibly explained by the finiteness of scale separation between the injection wavenumber and the smallest wavenumber of the domain, which here is a factor of 15. In the decaying case, there is a slight increase at the smallest wavenumber, which is probably explained by the dominance of kinetic energy over magnetic energy at the smallest wavenumbers. Within a range of wavenumbers covering almost an order of magnitude, the decay is purely exponential, which is argued to be a consequence of a suppression of nonlinearity due to the presence of strong cross helicity.

Place, publisher, year, edition, pages
2018. Vol. 339, no 9-10, p. 641-646
Keywords [en]
magnetic fields, magnetohydrodynamics, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-166864DOI: 10.1002/asna.201913602ISI: 000458954200002OAI: oai:DiVA.org:su-166864DiVA, id: diva2:1294148
Available from: 2019-03-06 Created: 2019-03-06 Last updated: 2019-03-06Bibliographically approved

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Brandenburg, Axel
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Nordic Institute for Theoretical Physics (Nordita)Department of Astronomy
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