Vis enkel innførsel

dc.contributor.authorBrandenburg, Axel
dc.contributor.authorHaugen, Nils Erland L
dc.contributor.authorLi, Xiang-Yu
dc.contributor.authorSubramanian, Kandaswamy R.
dc.date.accessioned2019-01-25T14:25:22Z
dc.date.available2019-01-25T14:25:22Z
dc.date.created2018-11-05T11:18:13Z
dc.date.issued2018
dc.identifier.citationMonthly notices of the Royal Astronomical Society. 2018, 479 (2), 2827-2833.nb_NO
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/11250/2582426
dc.description.abstractSmall-scale dynamos are expected to operate in all astrophysical fluids that are turbulent and electrically conducting, for example the interstellar medium, stellar interiors, and accretion discs, where theymay also be affected by or competingwith large-scale dynamos. However, the possibility of small-scale dynamos being excited at small and intermediate ratios of viscosity to magnetic diffusivity (the magnetic Prandtl number) has been debated, and the possibility of them depending on the large-scale forcing wavenumber has been raised. Here, we show, using four values of the forcing wavenumber, that the small-scale dynamo does not depend on the scale separation between the size of the simulation domain and the integral scale of the turbulence, i.e. the forcing scale. Moreover, the spectral bottleneck in turbulence, which has been implied as being responsible for raising the excitation conditions of small-scale dynamos, is found to be invariant under changing the forcing wavenumber. However, when forcing at the lowest few wavenumbers, the effective forcing wavenumber that enters in the definition of the magnetic Reynolds number is found to be about twice the minimum wavenumber of the domain. Our work is relevant to future studies of small-scale dynamos, of which several applications are being discussed. © 2018 The Author(s).nb_NO
dc.description.abstractVarying the forcing scale in low Prandtl number dynamosnb_NO
dc.language.isoengnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleVarying the forcing scale in low Prandtl number dynamosnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber2827-2833nb_NO
dc.source.volume479nb_NO
dc.source.journalMonthly notices of the Royal Astronomical Societynb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.1093/MNRAS/STY1570
dc.identifier.cristin1627004
cristin.unitcode7548,70,0,0
cristin.unitnameTermisk energi
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel

Navngivelse 4.0 Internasjonal
Med mindre annet er angitt, så er denne innførselen lisensiert som Navngivelse 4.0 Internasjonal