Energy transfers and magnetic energy growth in small-scale dynamo

Rohit Raj Kumar, Mahendra K. Verma, Ravi Samtaney

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In this letter we investigate the dynamics of magnetic energy growth in small-scale dynamo by studying energy transfers, mainly energy fluxes and shell-to-shell energy transfers. We perform dynamo simulations for the magnetic Prandtl number Pm = 20 on 10243 grid using the pseudospectral method. We demonstrate that the magnetic energy growth is caused by nonlocal energy transfers from the large-scale or forcing-scale velocity field to small-scale magnetic field. The peak of these energy transfers moves towards lower wave numbers as dynamo evolves, which is the reason why the integral scale of the magnetic field increases with time. The energy transfers U2U (velocity to velocity) and B2B (magnetic to magnetic) are forward and local. Copyright © EPLA, 2013.
Original languageEnglish (US)
Pages (from-to)54001
JournalEPL (Europhysics Letters)
Volume104
Issue number5
DOIs
StatePublished - Jan 2 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint

Dive into the research topics of 'Energy transfers and magnetic energy growth in small-scale dynamo'. Together they form a unique fingerprint.

Cite this