[Dune] [Dune-Commit] dune-grid r7996 - trunk/dune/grid/common

[Oliver Sander]

Hi,
for each type of boundary condition that is not homogeneous Neumann
I set up a file with a '1' for each vertex that is part of the
corresponding boundary part.  dune-fufem has a class BoundaryPatch,
which encapsulates parts of the boundary, and which you can set
up with a per-vertex bitfield (which you read from the file).
The BoundaryPatch provides an iterator over all boundary segments
that are part of the patch, and we have a special type of assemblers
that uses this iterator to assemble boundary conditions.

While having individual files for the different types of boundary
conditions may not be the most elegant way, our approach has
its advantages.  First of all, it doesn't rely on anything special
in the grid interface.  More importantly, my boundary conditions
need not be resolved by the macro grid boundary.  Sometimes that
is very useful.

best,
Oliver

Am 20.04.2012 20:02, schrieb Patrick Leidenberger:
> Hi Oliver,
>
> in your comment about the boundaryId you wrote that you have a good
> solution how to handle different boundary condition:
>
> On 04/18/2012 06:45 PM, Oliver Sander wrote:
>> I am a bit surprised
>> that so many people use boundaryId given that I have personally
>> never had to use one of these methods, even though some of my problems
>> have quite complicated boundary conditions.
>
> Can you please enlight me, how you handle them? I use the boundaryId in
> my code, but I am always open for new ideas.
>
> Best regards
>
> Patrick
>
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