Numerical studies of dynamo action in a turbulent shear flow. I.

Singh, Nishant K.; Jingade, Naveen

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6298

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DC Field	Value	Language
dc.contributor.author	Singh, Nishant K.	-
dc.contributor.author	Jingade, Naveen	-
dc.date.accessioned	2015-09-29T07:37:32Z	-
dc.date.available	2015-09-29T07:37:32Z	-
dc.date.issued	2015-06	-
dc.identifier.citation	The Astronomical Journal, 2015, Vol 806, p118	en
dc.identifier.issn	0004-6256	-
dc.identifier.issn	1538-3881 (Online)	-
dc.identifier.uri	http://hdl.handle.net/2289/6298	-
dc.description	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)	en
dc.description.abstract	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 ($\operatorname{Re}$) is below unity while the magnetic Reynolds number (${\rm Rm}$) is above unity; the exponential growth rate scales linearly with shear, which is consistent with earlier numerical works. The limit of low $\operatorname{Re}$ 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 $\operatorname{Re}\lt 1$ compared to the more formidable limit of $\operatorname{Re}\gt 1$. We also perform simulations in the regimes where (i) both ($\operatorname{Re}$, ${\rm Rm}$) < 1, and (ii) $\operatorname{Re}\gt 1$ and ${\rm Rm}\lt 1$, and compute all of the components of the turbulent transport coefficients (${{\alpha }_{ij}}$ and ${{\eta }_{ij}}$) 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.	en
dc.language.iso	en	en
dc.publisher	IOP Sciences for The American Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/abs/2015ApJ...806..118S	en
dc.relation.uri	http://arxiv.org/abs/1309.0200	en
dc.relation.uri	http://dx.doi.org/10.1088/0004-637X/806/1/118	en
dc.rights	2015 The American Astronomical Society	en
dc.title	Numerical studies of dynamo action in a turbulent shear flow. I.	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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