[ET Trac] [Einstein Toolkit] #2000: support radial boundary conidtion with Llama in NewRad

[Einstein Toolkit]

#2000: support radial boundary conidtion with Llama in NewRad
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  Reporter:  rhaas                  |       Owner:                     
      Type:  enhancement            |      Status:  review             
  Priority:  major                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  NewRad             
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Comment (by hinder):

 I tested that this works as expected for an outgoing radiative boundary
 condition by comparing with the static BC, and finding only a very small
 amount of incoming radiation (in psi0), and comparing the psi4 waveform
 with that from a causally disconnected boundary. Erik also had eyes on the
 code (he found a bug which I had missed).  One reason not to apply it
 would be the complaint that it is not a generic solution, since it only
 helps when the z coordinate is in fact radial.  It also may not work if
 the radial stretch is used and the stretched region extends to the outer
 boundary.  However, it allows us right now to implement causally-connected
 outer boundary conditions with the ET, and I think that is worth having
 even with those issues.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2000#comment:3>
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