Max,
the problem is that GridGenerator::extract_boundary_mesh doesn't
support the volume mesh to be an object of type
parallel::distributed::Triangulation.
This just isn't implemented yet. Do you actually need the input volume
mesh to be distributed?
Best,
Daniel
On Mon, May 6, 2024 at 12:06 PM 'Maximilian Hövener' via deal.II User
Group wrote:
>
> Dear all,
> in the course of my master thesis at the TU Dortmund I came across Deal.II
> while searching for a boundary element method. Is it possible to change the
> BEM explained in Step-34 to use it parallelised?
> I have already tried to make some changes using Step-40. This includes
> replacing the sparse matrix to a dense matrix using the PETSc library header
> files. This resulted in the following error message:
>
> An error occurred in line <8242> of file
>
> in function
> std::map::cell_iterator, typename
> MeshType::face_iterator>
> dealii::GridGenerator::extract_boundary_mesh(const MeshType&,
> MeshType<(dim - 1), spacedim>&, const std::set&) [with MeshType
> = dealii::parallel::distributed::Triangulation; int dim = 3; int spacedim =
> 3; typename MeshType::face_iterator =
> dealii::TriaIterator >; typename MeshType<(dim
> - 1), spacedim>::cell_iterator = dealii::TriaIterator 3> >]
> The violated condition was:
> (dynamic_cast< const parallel::distributed::Triangulation
> *>( &volume_mesh.get_triangulation()) == nullptr)
> Additional information:
> You are trying to use functionality in deal.II that is currently not
> implemented. In many cases, this indicates that there simply didn't
> appear much of a need for it, or that the author of the original code
> did not have the time to implement a particular case. If you hit this
> exception, it is therefore worth the time to look into the code to
> find out whether you may be able to implement the missing
> functionality. If you do, please consider providing a patch to the
> deal.II development sources (see the deal.II website on how to
> contribute).
>
> I am asuming that the problem results because of the use of the manifold,
> which is not embedded with parallelisation.
>
> Best regards,
> Max
>
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