KAUST DepartmentFluid and Plasma Simulation Group (FPS)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Online Publication Date2015-06-25
Print Publication Date2015-11-02
Permanent link to this recordhttp://hdl.handle.net/10754/594286
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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.
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.
SponsorsScience and Engineering Research Board[SERB/F/3279/2013-14]
PublisherInforma UK Limited
JournalJournal of Turbulence