[Dune] Boundary conditions, segments and indexing

[Carsten Gräser]

Hi Max,

Am 24.08.20 um 17:06 schrieb Firmbach, Max:
> ok this makes sense. In the meantime i tried the procedure with

I added support for reading quadrilateral boundary segments in

  https://gitlab.dune-project.org/core/dune-grid/-/merge_requests/441

In fact I did not check, if the segment indices and
tags are correct, because this should work once the
segments are actually implemented. Please have a look
and check if this fixes your problem. It would be nice
if you can report success or further issues in the corresponding
merge request or in this issue:

  https://gitlab.dune-project.org/core/dune-grid/-/issues/115

Best,
Carsten


PS:
I've taken the freedom to add a stripped version of
your .msh file to our test cases.

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