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Session: Magnetohydrodynamics 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 11:45
Room: Room F

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Rohit Kumar (Department of Physics, Indian Institute of Technology, Kanpur 208016, India)
Mahendra K. Verma (Department of Physics, Indian Institute of Technology, Kanpur 208016, India)

Abstract:
We study energy transfers during magnetic energy growth in small-scale and large-scale dynamos. We perform direct numerical simulations for magnetic Prandtl number Pm =20 and 0.2 in a periodic box on 1024^3 grid. Energy fluxes and shell-to-shell energy transfers indicate that in small-scale dynamo for Pm =20, the magnetic energy growth takes place due to a non-local energy transfer from large-scale velocity field to small-scale magnetic field. On the other hand, in large-scale dynamo for Pm =0.2, local energy transfers from large-scale velocity field to large-scale magnetic field takes place.