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Cross-helically forced and decaying hydromagnetic turbulence
KTH, Centra, Nordic Institute for Theoretical Physics NORDITA.ORCID-id: 0000-0002-7304-021X
Univ Waikato, Dept Math & Stat, Hamilton, New Zealand..
2018 (engelsk)Inngår i: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 339, nr 9-10, s. 641-646Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Wiley-VCH Verlagsgesellschaft, 2018. Vol. 339, nr 9-10, s. 641-646
Emneord [en]
magnetic fields, magnetohydrodynamics, turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-245965DOI: 10.1002/asna.201913602ISI: 000458954200002Scopus ID: 2-s2.0-85061657670OAI: oai:DiVA.org:kth-245965DiVA, id: diva2:1295525
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QC 20190312

Tilgjengelig fra: 2019-03-12 Laget: 2019-03-12 Sist oppdatert: 2019-03-12bibliografisk kontrollert

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