[ET Trac] [Einstein Toolkit] #1676: Add CT_MultiLevel elliptic solver to the Einstein Toolkit

[Einstein Toolkit]

#1676: Add CT_MultiLevel elliptic solver to the Einstein Toolkit
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  Reporter:  hinder       |       Owner:                     
      Type:  enhancement  |      Status:  confirmed          
  Priority:  major        |   Milestone:                     
 Component:  Other        |     Version:  development version
Resolution:               |    Keywords:                     
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Comment (by hinder):

 I think it's fine to keep the thorn in its current BitBucket repository.
 It is part of its own arrangement, which is the repository, anyway.  The
 thorn is described in the documentation, which I linked to.  I would like
 to update the description that I added to
 http://einsteintoolkit.org/about/gallery/incoming.php.  It currently reads

 > This simulation shows how to solve an elliptic equation. The source term
 and boundary conditions are specified via grid functions, in this case
 provided by the CT_Analytic thorn. Fixed mesh refinement concentrates
 points in the neighbourhood of the Gaussians, and a multigrid algorithm is
 used to solve the Poisson equation. The plots below show the converged
 solution, and the norm of the solution error as a function of time.

 First, is this correct?  I just realised that I didn't explain that the
 Gaussians were source terms (are they?).  It would be good to describe
 what is used as the boundary condition; I couldn't tell from briefly
 looking at the parameter file.  Also, if it's easy to change a grid
 spacing parameter and have it run on a workstation or laptop, we could
 mention that as well, so that people can try it out without a cluster.  I
 assume that with a lower resolution, it will converge much faster as well?
 We could also include a reference to the paper describing the solver.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1676#comment:5>
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