[ET Trac] [Einstein Toolkit] #1183: add conservative ENO operator to Carpet

[Einstein Toolkit]

#1183: add conservative ENO operator to Carpet
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 Reporter:  rhaas        |       Owner:  eschnett
     Type:  enhancement  |      Status:  new     
 Priority:  optional     |   Milestone:          
Component:  Carpet       |     Version:          
 Keywords:               |  
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 the attached patch adds a conservative ENO operator to Carpet which can be
 used in cell centered runs to conserve rest mass when
 regridding/prolongating. The operator is activated by setting he new
 Carpet parameter "Carpet::eno_interpolation_type" to "averages". The
 default is "samples" which selects the current ENO implementation.

 I also attach a parameter file that demonstrates the effect (can be turned
 into a test if we want to, also one can likely add the operator to
 CarpetExtra's prolongation test thorn).

 The final file attached contains the Maple worksheet to compute the ENO
 weights. All of this is based on the lecture notes by Shu

 http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19980007543_1998045663.pdf.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1183>
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