[ET Trac] [Einstein Toolkit] #963: Improve McLachlan accuracy

[Einstein Toolkit]

#963: Improve McLachlan accuracy
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  Reporter:  eschnett               |       Owner:        
      Type:  enhancement            |      Status:  review
  Priority:  major                  |   Milestone:        
 Component:  EinsteinToolkit thorn  |     Version:        
Resolution:                         |    Keywords:        
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Comment (by rhaas):

 This seems to be based on 3e4bb765aaff1776ef3da6840d55b4c417875803
 "Regenerate ML_ADM" which is from 2011-11-20. So my first questions would
 be if we could get a patch against a more modern version of McLachlan
 (ideally one including CCZ4 since it also modifies the equations quite a
 bit). The second comment (this is turning into a paper review) is that in
 enforceCalc the file does:
 {{{

     phi -> Max[phi,10^(-16)],
 }}}
 which seems wrong for the phi method where phi is the log of the conformal
 factor and might well be negative. Finally I would find it very useful if
 comments a la PRD XX YYYYY (ZZZZ) eqn EE were added for the constraint
 damping terms C1-C4. Since the source is the only documentation for ML it
 would be nice if all the references required to even understand where the
 equations come from were contained in it,

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/963#comment:2>
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