Thank you I appreciated it very much. Prof. Geuzaine indicated me a solution in the follow-up.
As i mentioned in my reply to his email below, I was confused/did not think, that the CPS6 type surface element with its own ID is one of the faces of a 3D C3D10 type tetrahedra element who has another ID. So looping over the tagged physical group surface elements is what I need to do! Many thanks again and best regards, Zuheyr On Mon, Jun 18, 2018 at 3:22 AM G. D. McBain <gdmcb...@protonmail.com> wrote: > ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ > Le 17 juin 2018 7:12 PM, Zuheyr Alsalihi <zuh...@gmail.com> a écrit : > > Is there a way to get the node ID's of the elements that lie on a > boundary surface in a 3d solid mesh where I mark the surface by creating a > physical surface. > > > I don't know how to do that directly in Gmsh, but for a (two-dimensional) > example using Python to extract the nodes belonging to different Physical > Lines, see > > https://github.com/kinnala/scikit-fem/blob/master/examples/ex14.py > > The essential line is the dict-comprehension on line 52: > > boundaries = {bc: > np.unique(cells['line'][cell_data['line'][' > gmsh:physical'] == > > field_data[bc][0]]) > > for bc in field_data if field_data[bc][1] > == 1} > > basically having loaded the mesh from Gmsh into Python with meshio, this > filters the element-node connectivity array according to the Physical > boundary entities, and then applies numpy.unique to each subset. > > -- Zuheyr Alsalihi
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