[Gmsh] Elements & Physical entities
Stephen Guzik
sguzik at utias.utoronto.ca
Fri Aug 1 04:21:39 CEST 2008
Hi Bob,
In the nightly snapshots there is a routine MakeGraph for building a
graph of the mesh in Mesh/Partition.h. A vertex in the graph is an
interior element and an edge in the graph is a face (or edge in 2D)
between two elements. So the graph describes the connectivity between
all the interior elements. The routine MakeGraph will also return a
vector of all boundary elements and the graph vertex (interior element)
that they connect to.
Hope that helps,
Stephen
Borek Patzak wrote:
> Hello,
>
> I have a question concerning the way how physical entities are exported.
> I would like to use the concept of physical entities to handle boundary
> conditions.
> From the documentation and my experiments it seems to me, that on
> output the mesh contains the elements associated to individual physical
> entities. My problem is following: if the physical entity is some part
> of boundary (curve in 2D or surface in 3D) of the whole domain, I need
> in some cases somehow to relate this information to domain elements,
> not to the "elements" discretized on the boundary. In the case of square
> 2D domain, where boundary condition is applied to one side, I need to
> pass this information to 2D elements, that have heir edge on this side.
> 1) Is there some way how to get this information from mesher?
> 2) If not, one can reconstruct this information from a list of
> edge-elements generated for this side. Does such a tool already exists?
>
> Thank you
> Bob
>
>
>
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