Dear Phuoc,
The problem come from the fact that the test is made on the mean unit
normal vector on a face. This mean unit normal vector is computed by
averaging the unit normal vector on each geometrical node of a face.
Unfortunately, for a pyramid element, the transformation is singular on
the geometrical nodes.
I replaced the mean of normal vector by the normal vector on the mean of
geometrical nodes of the face. It fixes the problem. (I push the change
on the master branch).
Best regards,
Yves
Le 14/06/2018 à 15:40, Huu Phuoc BUI a écrit :
Dear Yves,
Please find the mesh attached.
Thank you for your help.
Best regards,
Phuoc
On 14/06/2018 14:52, Yves Renard wrote:
Dear Phuoc,
No, I see no reason. If you can just send me the mesh in a format
readable by GetFEM, I could check what is wrong.
Best regards,
Yves
Le 14/06/2018 à 10:24, Huu Phuoc BUI a écrit :
Dear Getfem-users,
I have a problem with computing the outer faces when using a mixed
mesh (having tetras, hexa, prisms and pyramids).
The error is:
face_left = m.outer_faces_with_direction([0, 0., -1.0], 0.01)
File "/usr/local/lib/python2.7/dist-packages/getfem/getfem.py",
line 1372, in outer_faces_with_direction
return self.get("outer_faces_with_direction", v, angle, CVIDs)
File "/usr/local/lib/python2.7/dist-packages/getfem/getfem.py",
line 1152, in get
return getfem('mesh_get',self.id, *args)
RuntimeError: (Getfem::InterfaceError) -- Error in
bgeot_geometric_trans.cc, line 381 const base_matrix&
bgeot::geotrans_interpolation_context::B() const:
Non invertible matrix
Please let me know if you have any idea. Thank you.
Best regards,
Phuoc
--
Yves Renard ([email protected]) tel : (33) 04.72.43.87.08
Pole de Mathematiques, INSA-Lyon fax : (33) 04.72.43.85.29
20, rue Albert Einstein
69621 Villeurbanne Cedex, FRANCE
http://math.univ-lyon1.fr/~renard
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