[ET Trac] [Einstein Toolkit] #1152: Add option to compute center of mass to hydro_analysis and lots of smaller changes

[Einstein Toolkit]

#1152: Add option to compute center of mass to hydro_analysis and lots of smaller
changes
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  Reporter:  rhaas                  |       Owner:                
      Type:  enhancement            |      Status:  review        
  Priority:  minor                  |   Milestone:                
 Component:  EinsteinToolkit thorn  |     Version:                
Resolution:                         |    Keywords:  Hydro_Analysis
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Comment (by rhaas):

 myrho is declared by DECLARE_MY_VARIABLE(rho) in line 44. I am fine
 renaming the routine to "centroid" rather than "center of mass". Since
 this is only used to track the star and move the grids along using just
 rho is fine. For the actual center of mass one would either have to
 compute sqrt(det(g_ij)) * w_lorentz * rho or integrate dens. This would be
 more expensive. It is very easy to change the code so that it takes a
 parameter specifying what "rho" should be "HYDROBASE::rho" would be the
 current situation and "GRHYDRO::dens" would be the actual center of mass.
 Would that be acceptable?

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1152#comment:16>
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