Greg:
We want to construct a 3D triangulation by extruding a 2D triangulation
(one that potentially contains hanging nodes) and we only want one
slice/layer of mesh on the extrusion direction.
Looking around in the GridGenerator namespace led me to the
extrude_triangulation function. It’s doing everything we desire except
for that (a) the slices/layers on the extrusion direction has to be at
least two
I think this is poorly described in the documentation. The number of
slices = the number of cell layers plus one. Two slices => one layer of
cells. I've fixed this here:
https://github.com/dealii/dealii/pull/15028
and (b) the 2D mesh must be a coarse mesh. I’m wondering if
there are tips on getting around these two restrictions.
This you can't get around.
Originally I was using GridGenerator::hyper_rectangle teamed with
anisotropic refinement cut_xy. But this ceases to work after the code
was re-implemented with parallel::distributed::Triangulation because
“this class does not support anisotropic refinement, because it relies
on the p4est library that does not support this” [1].
Yes, and this is true regardless of how you generate the mesh. You can't
create an anisotropically refined mesh for p::d::T. This also means that
you cannot extrude a refined 2d mesh into 3d that has only one layer of
cells. You can extrude a coarse mesh, though, and then refine the
resulting mesh -- it will then have more than one layer in z-direction
in some locations, however.
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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