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Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Raman Research Institute, India; Indian Institute of Science, India; Inter-University Centre for Astronomy and Astrophysics, India.
Number of Authors: 2
2015 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 806, no 1, 118Article in journal (Refereed) Published
Abstract [en]

We perform numerical experiments to study the shear dynamo problem where we look for the growth of a large-scale magnetic field due to non-helical stirring at small scales in a background linear shear flow in previously unexplored parameter regimes. We demonstrate the large-scale dynamo action in the limit where the fluid Reynolds number (Re) is below unity while the magnetic Reynolds number (Rm) is above unity; the exponential growth rate scales linearly with shear, which is consistent with earlier numerical works. The limit of low Re is particularly interesting, as seeing the dynamo action in this limit would provide enough motivation for further theoretical investigations, which may focus attention on this analytically more tractable limit of Re < 1 compared to the more formidable limit of Re > 1. We also perform simulations in the regimes where (i) both (Re, Rm) < 1, and (ii) Re > 1 and Rm < 1, and compute all of the components of the turbulent transport coefficients (alpha(ij) and alpha(ij)) using the test-field method. A reasonably good agreement is observed between our results and the results of earlier analytical works in similar parameter regimes.

Place, publisher, year, edition, pages
2015. Vol. 806, no 1, 118
Keyword [en]
dynamo, magnetic fields, magnetohydrodynamics (MHD), turbulence
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-118968DOI: 10.1088/0004-637X/806/1/118ISI: 000356810300118OAI: diva2:842675
Available from: 2015-07-21 Created: 2015-07-21 Last updated: 2015-07-21Bibliographically approved

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