[ET Trac] [Einstein Toolkit] #591: Add harmonic shift to McLachlan

[Einstein Toolkit]

#591: Add harmonic shift to McLachlan
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 Reporter:  hinder                 |       Owner:     
     Type:  enhancement            |      Status:  new
 Priority:  minor                  |   Milestone:     
Component:  EinsteinToolkit thorn  |     Version:     
 Keywords:  McLachlan              |  
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 The attached patch adds a harmonic shift condition to McLachlan.  It does
 this by introducing a new real-valued parameter harmonicShift.  This
 should be set to 0 for gamma-driver shift (the default, and the existing
 behaviour), and to 1 for harmonic shift.  This is useful for code-
 correctness tests with the shifted gauge wave which is an exact solution
 of the Einstein equations in harmonic gauge.  The harmonic shift equation
 has been tested with the shifted gauge wave exact solution and yields
 convergence to the exact solution.

 The current way that gauge conditions is handled in McLachlan is not very
 elegant, and I don't think this patch should be applied as-is.  I am
 putting it here for anyone who might find it useful.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/591>
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