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Hi.<br>
Conforming or non conforming? If non conforming you have a hanging<br>
node and if you move coarse and fine intersections will not match
(the<br>
coarse grid element does not know about the hanging nor where it<br>
is). Could that be your problem?<br>
Best<br>
Andreas<br>
<br>
<br>
<div class="moz-cite-prefix">On 24/02/15 15:39, Marco Cisternino
wrote:<br>
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<div style="font-family: arial,helvetica,sans-serif; font-size:
12pt; color: #000000">Hi Andreas, thank you for your reply.<br>
I'm using GeometryGrid and ALU together. I provide ALU with a
DiscreteDeformationFunction (my coarse element parametrization).
Any time a new point appears in the mesh after a refinement I
move that point using the DiscreteDeformationFunction.<br>
The problem appears for local refinement. On the other hand, if
I globally refine the mesh I have no problem about the
divergence of the cells: it is zero everywhere.<br>
However, if I refine only a bunch of cells, then the coarse
ones, sharing intersection with the fine ones, have non-zero
divergence.<br>
I'm doing all this using the following methods:<br>
intersection centerOuterUnitNormal<br>
and codimension 1 volume method (choosing the element face
corresponding to the intersection)<br>
I hope it is clearer.<br>
Thanks,<br>
<br>
Marco<br>
<br>
<br>
<hr id="zwchr">
<div
style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>Da:
</b>"Andreas Dedner" <a class="moz-txt-link-rfc2396E" href="mailto:a.s.dedner@warwick.ac.uk"><a.s.dedner@warwick.ac.uk></a><br>
<b>A: </b><a class="moz-txt-link-abbreviated" href="mailto:dune@dune-project.org">dune@dune-project.org</a><br>
<b>Inviato: </b>Martedì, 24 febbraio 2015 12:14:33<br>
<b>Oggetto: </b>Re: [Dune] parametrized AMR and cell
divergence<br>
<br>
I'm not quite sure I understand the question. Are you seeing
problems<br>
when refining the grid using ALU's standard globalRefine
method or do the problems<br>
only appear when you use your local parametrization and after
moving nodes around<br>
(I'm not quite clear how you do that with ALU....).<br>
Andreas<br>
<br>
<br>
<div class="moz-cite-prefix">On 24/02/15 11:00, Marco
Cisternino wrote:<br>
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<div style="font-family: arial,helvetica,sans-serif;
font-size: 12pt; color: #000000">Good morning,<br>
I would like to ask duners about deformed AMR.<br>
I'm working with body fitted mesh and ALUGrid.<br>
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<div style="font-family: arial,helvetica,sans-serif;
font-size: 12pt; color: #000000">In order to refine my
mesh I compute a local parametrization for every coarse
element, then I refine the mesh moving new nodes using my
parametrization.<br>
Therefore I compute the cell divergence summing over the
cell intersection<br>
normal . flux * area<br>
where intersection normals and areas are computed by Dune
methods centerUnitNormal and volume(this for a face),
while flux is (1,1,1) everywhere.<br>
I expect 0 over the entire mesh and this is true on the
coarse grid, but for a refined grid this is not true for
coarse cells sharing intersections with finer cells.<br>
Does anyone see something like this? And is there a cure?
Am I doing something wrong?<br>
<br>
Thanks for any hint.<br>
Bests,<br>
<br>
Marco<br>
<br>
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