[ET Trac] [Einstein Toolkit] #1221: Reduction weight anomaly when using zero CoordBase::boundary_shiftout_*

[Einstein Toolkit]

#1221: Reduction weight anomaly when using zero CoordBase::boundary_shiftout_*
------------------------+---------------------------------------------------
 Reporter:  bentivegna  |       Owner:  eschnett           
     Type:  defect      |      Status:  new                
 Priority:  minor       |   Milestone:                     
Component:  Carpet      |     Version:  development version
 Keywords:              |  
------------------------+---------------------------------------------------
 When using a refinement level that covers the entire grid, and setting the
 CoordBase::boundary_shiftout_* parameters to zero, the following warning
 appears:

 INFO (CarpetReduce): Simulation domain volume:  8000
 INFO (CarpetReduce): Additional excised volume: 0
 INFO (CarpetReduce): Reduction weight sum:      9141
 WARNING level 1 in thorn CarpetReduce processor 0 host socket.local
   (line 137 of
 /Users/bennie/CactusTrees/TrueAMR/arrangements/Carpet/CarpetReduce/src/mask_test.c):
   -> Simulation domain volume and reduction weight sum differ

 This can be reproduced using the attached parameter file. The problem
 seems to arise at the boundaries of the restricted region: I would expect
 the coarse grid to carry zero reduction weight everywhere (as it does if
 the shiftout is one), but the boundaries have a non-zero weight instead,
 which leads to double counting, and hence the difference between domain
 volume and weight sum.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/1221>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit