[Dune] Usage of "BoundaryDomain" or "BoundarySegment" for surface meshes

[Sacconi, Andrea]

Hi everyone,

coming back to the question I posted two days ago, about how to specify the boundary for a surface mesh in a DGF file: just to be more precise, neither BOUNDARYDOMAIN nor BOUNDARYSEGMENT works.

I tried also 

BOUNDARYDOMAIN
2           -1 -1 0 1 -1 0
2           1 1 0 -1 1 0
3           1 -1 0 1 1 0
3           -1 -1 0 -1 1 0

but no luck.
Any clever idea why it does not work for surface meshes? Or am I wrong somewhere? 

Cheers,
Andrea
__________________________________________________________

Andrea Sacconi
PhD student, Applied Mathematics
AMMP Section, Department of Mathematics, Imperial College London,
London SW7 2AZ, UK
a.sacconi11 at imperial.ac.uk

________________________________________
From: dune-bounces+a.sacconi11=imperial.ac.uk at dune-project.org [dune-bounces+a.sacconi11=imperial.ac.uk at dune-project.org] on behalf of Sacconi, Andrea [a.sacconi11 at imperial.ac.uk]
Sent: 29 January 2014 12:00
To: dune at dune-project.org
Subject: [Dune] Usage of "BoundaryDomain" or "BoundarySegment" for surface      meshes

Hi DUNErs,

I would like to ask you a quick question about how to specify the boundary of your mesh in a DGF file.
I'm dealing with surface meshes, so for example a collection of triangles in R^3. I tried to prescribe the boundaries using BOUNDARYDOMAIN or BOUNDARYSEGMENT, as I always do, but now it doesn't work.
I always get the boundaryId equal to 1, the default value. Why?
The file I am using sounds like the following. It's a sort of "pyramid", without the flat base. So four elements and five vertices, with 2 and 3 as boundary labels. Where am I wrong?

DGF
% Elements = 4  |  Vertices = 5

VERTEX

-1.0 -1.0 0.0
1.0 -1.0 0.0
1.0 1.0 0.0
-1.0 1.0 0.0
-0.975 0.0 2.0
#

SIMPLEX
0 1 4
1 4 2
2 4 3
3 4 0
#

BOUNDARYSEGMENTS
2        0 1
2        2 3
3        1 2
3        0 3
#

GRIDPARAMETER
#

__________________________________________________________

Andrea Sacconi
PhD student, Applied Mathematics
AMMP Section, Department of Mathematics, Imperial College London,
London SW7 2AZ, UK
a.sacconi11 at imperial.ac.uk

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