add new parameter

real min_horizon_size_for_mask \
  "only set mask if min horizon radius >= this number of local grid spacings"

docs will follow shortly...


git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinAnalysis/AHFinderDirect/trunk@1208 f88db872-0e4f-0410-b76b-b9085cfa78c5

1 files changed, 20 insertions, 0 deletions

diff --git a/param.ccl b/param.ccl
index 4c4e2e8..3c2a842 100644
--- a/param.ccl
+++ b/param.ccl
@@ -528,6 +528,26 @@ boolean mask_is_noshrink \
 } "true"
 
 #
+# If we're using mesh refinement (eg Carpet) it's possible to find a
+# horizon on a fnie grid, and then set a mask on a coarser grid where
+# the masked-off region is only a few grid points across.  This then
+# confuses various other thorns (eg LegoExcision) which require excised
+# regions to be "not too small".
+#
+# So...  This parameter may be used to specify that the mask not be set
+# for a given horizon (just as if that horizon wasn't found) on any grid
+# where the ratio
+#	BH_diagnostics.min_radius / max(Delta_x,Delta_y,Delta_z)
+# (where  Delta_[xyz]  are the *LOCAL* grid spacings on the current grid)
+# is too small (in particular, < this parameter).  
+#
+real min_horizon_size_for_mask \
+  "only set mask if min horizon radius >= this number of local grid spacings"
+{
+0.0:* :: "any real number >= 0.0"
+} 0.0
+
+#
 # This thorn supports two types of mask grid functions:
 # * the "old" style is that defined by CactusEinstein/AHFinder:
 #   the mask is a CCTK_REAL grid function, which is set to specified