Hi,
I'm not sure I understand exactly what you want to do, but if you know
which cell you want in a triangulation by level and index you can get its
center by creating the cell iterator. For example:
const int dim = 2;
Triangulation<dim> triangulation;
GridGenerator::hyper_cube(triangulation);
const unsigned int cell_level = 0, cell_index = 0;
const auto cell = Triangulation<dim>::active_cell_iterator(&triangulation,
cell_level,
cell_index);
std::cout << cell->center() << std::endl;
Maybe this answer is useful too:
https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#can-i-convert-triangulation-cell-iterators-to-dofhandler-cell-iterators
Best,
Simon
On Thursday, April 29, 2021 at 10:48:30 AM UTC+2 [email protected] wrote:
> Hi all,
>
> I'm looking to map DoF from the bottom of an extruded volumetric mesh to
> the corresponding DOF on the surface of the mesh. Right now, I'm saving the
> cell "number"/ID of each cell in the bottom layer of the volume mesh, and
> want to match it with a surface cell by comparing their centers
>
> - I could loop over all the volume cells until I find the one matching
> the surface cell center, but as I have the cell numbers, I would rather
> access the cell center from the cell id (which looks to me like an
> unsigned
> int)
> - something like get_cell(cell_id)->center --- is this possible?
> - Alternatively, I was thinking that a periodic boundary condition
> linking the bottom of the volume mesh with the top might be able to
> achieve
> the same thing, but I wasn't sure how to go about setting it up
>
> Any pointers would be appreciated!
> Corbin
>
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