[ET Trac] [Einstein Toolkit] #713: Implement "Conformal Covariant Z4" formulation in McLachlan

[Einstein Toolkit]

#713: Implement "Conformal Covariant Z4" formulation in McLachlan
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  Reporter:  barry.wardell          |       Owner:        
      Type:  enhancement            |      Status:  review
  Priority:  major                  |   Milestone:        
 Component:  EinsteinToolkit thorn  |     Version:        
Resolution:                         |    Keywords:        
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Comment (by barry.wardell):

 Replying to [comment:13 knarf]:
 > It would be good to make the 'formulation' parameter a keyword, with
 'BSSN' the default and 'CCZ4' the only other option (for now). Simply
 'formulation' isn't quite describing what it does.

 While i agree this would be nice in principal, it has not been done this
 way for a few reasons:

 1. Checking against a keyword is much more computationally expensive than
 an integer. This check is done inside the rhs assignement in the grid loop
 in a calculation, so is performance critical.
 2. This is not how things are implemented for other parameters, most
 notably the conformalMethod parameter.
 3. I don't know if this is currently possible in reasonable way with
 Kranc.

 However, if someone can suggest a good (i.e. non-hacky) way of
 implementing it as a keyword parameter, I would be happy to use that
 instead.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/713#comment:14>
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