[ET Trac] [Einstein Toolkit] #2189: Carpet/CarpetLib: Add Lagrange_third_order_prolong prolongation option.

[Einstein Toolkit]

#2189: Carpet/CarpetLib: Add Lagrange_third_order_prolong prolongation option.
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 Reporter:  zachetie@…   |      Owner:  rhaas@…
     Type:  enhancement  |     Status:  assigned
 Priority:  unset        |  Milestone:
Component:  Other        |    Version:  development version
 Keywords:               |
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 When the default prolongation type is chosen in a dynamical spacetime
 evolution, hydrodynamic and GRMHD fields can suffer from spurious
 oscillations generated at AMR refinement boundaries due to the high-order
 Lagrange polynomial prolongation.

 As there is no way to directly specify the prolongation order in the
 interface.ccl, I have created a Carpet pull request that adds the desired
 order (3rd) Lagrange polynomial prolongation:

 https://bitbucket.org/eschnett/carpet/pull-requests/21/

 I would like this to be the default prolongation option for IllinoisGRMHD
 and GiRaFFE, so it would be immediately useful.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/2189>
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