[ET Trac] [Einstein Toolkit] #878: Tests using Exact should use EinsteinExact

[Einstein Toolkit]

#878: Tests using Exact should use EinsteinExact
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  Reporter:  hinder                 |       Owner:            
      Type:  enhancement            |      Status:  new       
  Priority:  major                  |   Milestone:  ET_2012_11
 Component:  EinsteinToolkit thorn  |     Version:            
Resolution:                         |    Keywords:            
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Comment (by eschnett):

 The Brill-Lindquist coordinates are really simple -- the conformal factor
 is 1+m/(2r), everything else is Minkowski. We should add this to
 EinsteinExact. Could you add a parameter to change the matching radius to
 ModifiedSchwarzschildBL? In experiments we learned that one needs to have
 about ten unmodified grid points inside the event horizon to avoid things
 propagating to the outside.

 On a different note: many exact solutions will have singularities. Would
 it make sense to have a generic way of handling them, i.e. a generic way
 to replace r=0 in analytic expressions?

 I don't know this particular test case, but in principle QLM is also used
 inside the horizon.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/878#comment:3>
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