[ET Trac] [Einstein Toolkit] #1399: add evolution method "stationary" to ADMBase

[Einstein Toolkit]

#1399: add evolution method "stationary" to ADMBase
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  Reporter:  rhaas                  |       Owner:                     
      Type:  enhancement            |      Status:  review             
  Priority:  minor                  |   Milestone:                     
 Component:  EinsteinToolkit thorn  |     Version:  development version
Resolution:                         |    Keywords:  ADMBase            
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Comment (by eschnett):

 In this context, I do not understand why there should be a difference
 between "static" and "stationary", and why this difference should include
 re-applying initial conditions when the grid structure changes... If we do
 this, it should probably have a different name. Note that this is not
 restricted to stationary cases, since the initial condition may depend on
 cctk_time. In that case, one needs to apply the initial conditions at
 every time step, not only after grid structure changes.

 Thorn Exact offer this feature already. It does so by defining an
 evolution method that re-applies the initial condition as necessary.

 I suggest two new parameter settings, one for static and one for non-
 static situations, so that thorn Exact's setting of the evolution method
 is not necessary any more. These two settings could e.g. be called
 "reapply-initial-condition-after-grid-structure-changes" and "reapply-
 initial-condition-at-every-time-step", only much shorter.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1399#comment:2>
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