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Diffstat (limited to 'Carpet/CarpetReduce/README')
| -rw-r--r-- | Carpet/CarpetReduce/README | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Carpet/CarpetReduce/README b/Carpet/CarpetReduce/README new file mode 100644 index 000000000..8692a2930 --- /dev/null +++ b/Carpet/CarpetReduce/README @@ -0,0 +1,29 @@ +Cactus Code Thorn CarpetReduce +Authors : Erik Schnetter <schnetter@uni-tuebingen.de> +CVS info : $Header: /home/eschnett/C/carpet/Carpet/Carpet/CarpetReduce/README,v 1.3 2004/06/14 07:01:21 schnetter Exp $ +-------------------------------------------------------------------------- + +Purpose of the thorn: + +This thorn provides parallel reduction operators for Carpet. + + + +This thorn now uses a weight function. This makes it possible to +perform physically meaningful spatial reduction operations. The +weight is 1 for all "normal" grid points. + +The weight is set to 0 on symmetry and possible the outer boundary, +and it might be set to 1/2 on the edge of the boundary. Setting this +depends on the coordinate thorn, and currently works only when the +coordinates are defined via CoordBase. + +The weight is also reduced or set to 0 on coarser grids that are +overlaid by finer grid. + +The weight should also be reduced or set to 0 near and in excised +regions. This should happen in conjunction with an excision boundary +thorn. + +This weigth function should probably be extracted into its own thorn +MaskBase, so that many thorns can easily operate on it. |