Energy transfers in dynamos with small magnetic Prandtl numbers

Handle URI:
http://hdl.handle.net/10754/594286
Title:
Energy transfers in dynamos with small magnetic Prandtl numbers
Authors:
Kumar, Rohit; Verma, Mahendra K.; Samtaney, Ravi ( 0000-0002-4702-6473 )
Abstract:
We perform numerical simulation of dynamo with magnetic Prandtl number Pm = 0.2 on 10243 grid, and compute the energy fluxes and the shell-to-shell energy transfers. These computations indicate that the magnetic energy growth takes place mainly due to the energy transfers from large-scale velocity field to large-scale magnetic field and that the magnetic energy flux is forward. The steady-state magnetic energy is much smaller than the kinetic energy, rather than equipartition; this is because the magnetic Reynolds number is near the dynamo transition regime. We also contrast our results with those for dynamo with Pm = 20 and decaying dynamo. © 2015 Taylor & Francis.
KAUST Department:
Mechanical Engineering Program; Physical Sciences and Engineering (PSE) Division
Citation:
Kumar R, Verma MK, Samtaney R (2015) Energy transfers in dynamos with small magnetic Prandtl numbers. Journal of Turbulence 16: 1114–1134. Available: http://dx.doi.org/10.1080/14685248.2015.1057340.
Publisher:
Informa UK Limited
Journal:
Journal of Turbulence
Issue Date:
25-Jun-2015
DOI:
10.1080/14685248.2015.1057340
Type:
Article
ISSN:
1468-5248
Sponsors:
Science and Engineering Research Board[SERB/F/3279/2013-14]
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorKumar, Rohiten
dc.contributor.authorVerma, Mahendra K.en
dc.contributor.authorSamtaney, Ravien
dc.date.accessioned2016-01-19T14:45:14Zen
dc.date.available2016-01-19T14:45:14Zen
dc.date.issued2015-06-25en
dc.identifier.citationKumar R, Verma MK, Samtaney R (2015) Energy transfers in dynamos with small magnetic Prandtl numbers. Journal of Turbulence 16: 1114–1134. Available: http://dx.doi.org/10.1080/14685248.2015.1057340.en
dc.identifier.issn1468-5248en
dc.identifier.doi10.1080/14685248.2015.1057340en
dc.identifier.urihttp://hdl.handle.net/10754/594286en
dc.description.abstractWe perform numerical simulation of dynamo with magnetic Prandtl number Pm = 0.2 on 10243 grid, and compute the energy fluxes and the shell-to-shell energy transfers. These computations indicate that the magnetic energy growth takes place mainly due to the energy transfers from large-scale velocity field to large-scale magnetic field and that the magnetic energy flux is forward. The steady-state magnetic energy is much smaller than the kinetic energy, rather than equipartition; this is because the magnetic Reynolds number is near the dynamo transition regime. We also contrast our results with those for dynamo with Pm = 20 and decaying dynamo. © 2015 Taylor & Francis.en
dc.description.sponsorshipScience and Engineering Research Board[SERB/F/3279/2013-14]en
dc.publisherInforma UK Limiteden
dc.subjectdirect numerical simulationen
dc.subjectdynamoen
dc.subjectenergy transfersen
dc.subjectmagnetic field generationen
dc.subjectmagnetohydrodynamic turbulenceen
dc.titleEnergy transfers in dynamos with small magnetic Prandtl numbersen
dc.typeArticleen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalJournal of Turbulenceen
dc.contributor.institutionDepartment of Physics, Indian Institute of Technology, Kanpur, Indiaen
kaust.authorSamtaney, Ravien
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