Erik,
you might want to have a look at
https://groups.google.com/d/msg/dealii/wG6aJdXHweA/IcsUjxj5dFsJ
Basically, I would loop through all the neighbors recursively only
considering cells that have a vertex with the face you are looking for in
common.
You can access the DoFs on faces just as for cells via
std::vector<types::global_dof_index> dof_indices(fe.dofs_per_face);
for (; cell != endc; ++cell)
if (!cell->is_artificial())
for (unsigned int face=0; face<GeometryInfo<dim>::faces_per_cell;
++face)
[...]
cell->face(face)->get_dof_indices(dof_indices);
[...]
Maybe also look into step-42 for accessing DoFs on faces.
Best,
Daniel
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