Changes between Version 14 and Version 15 of ControllingRefinement

Timestamp:

09/15/11 10:28:19 (13 years ago)

Author:

ehansen

Comment:

—

ControllingRefinement

@@ -118 +118 @@
 
 === Changing qTolerance and !DesiredFillRatios ===
-The most direct and quickest way to change refinement is to change the {{{qTolerance}}} and !DesiredFillRatios arrays which are both located in the {{{global.data}}} file.  Each element of these arrays is specific to that level. For example, the first element is for the root level, the next element is for the 1st level of refinement, and so on. {{{qTolerance}}} effectively sets how large a gradient must be in order for those two cells to be refined.  Higher {{{qTolerance}}} --> less refinement.
+The most direct and quickest way to change refinement is to change the {{{qTolerance}}} and !DesiredFillRatios arrays which are both located in the {{{global.data}}} file.  Each element of these arrays is specific to that level. For example, the first element is for the root level, the next element is for the 1st level of refinement, and so on. {{{qTolerance}}} effectively sets how large a gradient must be in order for those two cells to be refined.  Higher {{{qTolerance}}} --> less refinement.  !DesiredFillRatios "encourages" astrobear to refine that percentage of the cells marked for refinement. We say "encourage" because astrobear might not get the ratio exactly right.  This is because the AMR is grid/patch based rather than cell based.  For example, if the DesiredFillRatio is 0.7, then the AMR will lay down grids/patches in such a way to attempt to cover 70% of the cells marked for refinement.  As a result of this process, it is possible that cells that were not marked for refinement are now refined.  In general, higher !DesiredFillRatios --> more refinement.
 
-||  qTolerance = (0.2, 0.2)  !DesiredFillRatios = (0.7, 0.7)  ||  qTolerance = (0.2, 0.3)  !DesiredFillRatios = (0.7, 0.7)  ||                            ||
+||  qTolerance = (0.2, 0.2)  !DesiredFillRatios = (0.7, 0.7)  ||  qTolerance = (0.2, 0.35)  !DesiredFillRatios = (0.7, 0.7)  ||                            ||
 || [[Image(mesh1.png, width=580)]] || [[Image(mesh2.png, width=580)]] ||