Directory:
    ${PENCIL_HOME}/samples/1d-tests/reversed_field_pinch
SVN Id:
    $Id$
Maintainer:
    Axel Brandenburg <brandenb/nordita[dot]org>
Added:
    22-Nov-2009
Status:
    succeeds # One of [succeeds|failing since <date>|obsolete| ...]
Recommended resolution:
    32x1x1 for eta=1e-2 is fine.
Comments:
    The initial field is a Bessel function. The field decays resistively
    subject to magnetic helicity evolution, as modeled by the dynamical
    alpha equation. A diffusive magnetic helicity flux is added.
References:
    The formalism is close to that used in:
    Brandenburg, A., Candelaresi, S., & Chatterjee, P.: 2009,
    ``Small-scale magnetic helicity losses from a mean-field dynamo,''
    Monthly Notices Roy. Astron. Soc. 398, 1414-1422 (arXiv:0905.0242)

Scaling results for different resolution (alpm_int should be pi)
     nx    pi
     32  3.15140
     64  3.14397
    128  3.14218
    256  3.14174
    512  3.14163

older versions:
  svn up -r15668   sementation fault
  svn up -r18000   nompicomm.f90, line 1103: Conflicting attributes or multiple declaration of name.
  svn up -r20000   No rule to make target `entropy.h', needed by `noentropy.o'