Directory:
    ${PENCIL_HOME}/samples/testfield
SVN Id:
    $Id$
Maintainer:
    Axel Brandenburg <brandenb/nordita[dot]dk>
Added:
    26-Jun-2005
Status:
    succeeds # One of [succeeds|failing since <date>|obsolete| ...]
Recommended resolution:
    32x32x32 with etatest=5e-2 works fine.
Comments:
    This procedure allows the full alpha and eta tensors to be calculated.
    Different test fields can be used. Note however that the result is
    in general wavenumber dependent. The present examples is for the
    Roberts flow.
References:
    Brandenburg, A.: 2005, ``Turbulence and its parametrization in
    accretion discs,'' Astron. Nachr. 326, 787-797