Energy transfers in small-scale and large-scale dynamos etc15 Tracking Number 152Presentation: Session: Magnetohydrodynamics 1 Room: Room F Session start: 10:30 Tue 25 Aug 2015 Rohit Kumar rohitkumar.iitk@gmail.com Affifliation: Department of Physics, Indian Institute of Technology, Kanpur 208016, India Mahendra K. Verma mkv@iitk.ac.in Affifliation: Department of Physics, Indian Institute of Technology, Kanpur 208016, India Topics: - MHD turbulence 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. |