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Amplification of large-scale magnetic field in nonhelical magnetohydrodynamics

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.
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Submitted on : Tuesday, May 24, 2022 - 2:11:08 PM
Last modification on : Wednesday, June 1, 2022 - 4:07:02 AM

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Rohit Kumar, Mahendra K. Verma. Amplification of large-scale magnetic field in nonhelical magnetohydrodynamics. Physics of Plasmas, 2017, 24, ⟨10.1063/1.4997779⟩. ⟨insu-03676946⟩

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