Cactus Code Thorn MinDist_Shift
Authors    : Mark Miller
CVS info   : $Header$
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1.  Purpose of the thorn:
----------------------------
This thorn solves the minimal distortion shift and variants thereof.
Additionally, this thorn computes the residual of the minimal
distortion equation (in the form without the momentum constraint
substituted in).  These fields are called mindist_x_resid, mindist_y_resid,
and mindist_z_resid.


2. Dependencies of the thorn
----------------------------
This thorn additionally requires thorn einstein.  If you
actually want to use it, you will need BAM_Elliptic and BAM_VecLap
too.


3. Additional information
--------------------------

To use this thorn to compute the minimal distortion shift, just set

shift = "min_dist"

in your parameter file.  



PARAMETERS
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STRINGS:

mindist_sub_momcon    = [yes,no]      Should the momentum constraints be
                                      substituted into the minimal
                                      distortion shift equation?
                                      (default = "yes")

mindist_shift_bound   = [static,zero] Should the boundaries be left alone
                                      (static) or actively set them to
                                      zero (zero)?
                                      (default = "static")


REALS:

mindist_elliptic_tol  = (real)        Tolerence for elliptic solver.
                                      (default = 1.0e-6).

INTEGERS:

mindist_every =        (integer)      How often do we solve the
                                      Minimum Distortion Shift?
                                      (default = 1).

Please see http://wugrav.wustl.edu/ASC/internal/asccodes.html for
more information and conditions of usage.