Amplification of large-scale magnetic field in nonhelical magnetohydrodynamics

Rohit Kumar, Mahendra K. Verma

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

It is typically assumed that the kinetic and magnetic helicities play a crucial role in the growth of large-scale dynamo. In this paper, we demonstrate that helicity is not essential for the amplification of large-scale magnetic field. For this purpose, we perform nonhelical magnetohydrodynamic (MHD) simulation, and show that the large-scale magnetic field can grow in nonhelical MHD when random external forcing is employed at scale 1/10 the box size. The energy fluxes and shell-to-shell transfer rates computed using the numerical data show that the large-scale magnetic energy grows due to the energy transfers from the velocity field at the forcing scales.
Original languageEnglish (US)
Pages (from-to)092301
JournalPhysics of Plasmas
Volume24
Issue number9
DOIs
StatePublished - Aug 11 2017
Externally publishedYes

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