Dynamo action at low magnetic Prandtl numbers: Mean flow versus fully turbulent motions

AMS Citation:
Ponty, Y., P. D. Mininni, J. -F. Pinton, H. Politano, and A. Pouquet, 2007: Dynamo action at low magnetic Prandtl numbers: Mean flow versus fully turbulent motions. New Journal of Physics, 9, 11 pp, doi:10.1088/1367-2630/9/8/296.
Date:2007-08-01
Resource Type:article
Title:Dynamo action at low magnetic Prandtl numbers: Mean flow versus fully turbulent motions
Abstract: We compute numerically the threshold for dynamo action in Taylor-Green (TG) swirling flows. Kinematic dynamo calculations, for which the flow field is fixed to its time average, are compared to dynamical runs, with the Navier-Stokes and induction equations jointly solved. The dynamo instability for the kinematic calculations is found to have two branches. The dynamical dynamo threshold at low Reynolds numbers lies within the low branch, while at high Reynolds numbers it gets closer to the high branch. Based on these results, the effect of the mean flow and of the turbulent fluctuations in TG dynamos are discussed.
Peer Review:Refereed
Copyright Information:Copyright 2007 IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
OpenSky citable URL: ark:/85065/d7rx9cbq
Publisher's Version: 10.1088/1367-2630/9/8/296
Author(s):
  • Yannick Ponty
  • Pablo Mininni - NCAR/UCAR
  • Jean-François Pinton
  • H. Politano
  • Annick Pouquet - NCAR/UCAR
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