Phani,
Regarding the distribution of indices for degrees of freedom it says in
the manual " Since the triangulation is traversed starting with the
cells of the coarsest active level and going to more refined levels, the
lowest numbers for dofs are given to the largest cells as well as their
bounding lines and vertices, with the dofs of more refined cells getting
higher numbers."
Now I generated one cell using GridGenerator::hyper_cube(triangulation)
and then did a global refinement to generate 8 cells using
triangulation.refine_global(1). After attaching the dofHandler object to
the triangulation and I printed the global indices and coordinates of
support points. *I expected that the new vertices which are created
after the global refinement will have higher numbers than the numbers
corresponding to corner vertices which are originally there in the
coarsest cell. But I noticed the numbering of vertices is different. *
You say "vertices...will have higher numbers", by which I assume you
refer to the DoF indices located on these vertices, not the vertex
indices, correct? (The latter is a property of the triangulation, the
former of the DoFHandler.)
Am I missing anything here? Is there anyway to get the new vertices of
the refined mesh numbered so that they have the higher numbers than the
vertices of the coarsest cell. I need this particular numbering to be
continued for further global refinements.
You cannot change the vertex indices. But assuming I am right with my
statement above, you *can* of course change the DoF indices.
The numbering you observe results from the fact that "the lowest numbers
for dofs are given to the largest cells as well as their bounding lines
and vertices, with the dofs of more refined cells getting higher
numbers." In your case, *all* cells are at the same level, so numbering
of DoFs happens by just walking through all active cells, which are the
ones on level 1 in your case.
If you want to change DoF indices, you can always use
DoFHandler::renumber_dofs() and just provide whatever ordering you want.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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