Hi Germán,
thanks for the hints and the backgoundinformations. I'll give them a try.
Installing the GMSH Macro takes just a few seconds and works very well
and the macro could be changed without changing FreeCAD code.
Regarding integrading GMSH in FreeCAD the way it is done with
CalculiX. Yeah it would be for sure possible. Integrating the macro in
FreeCAD takes time to develop. It's like most feature requests on open
source software. It has to be done by someone.
For CalculiX the integration had to be done, because there was and is
still plenty of code needed for an calculix input file writer and
calculix output file reader. Where GMSH just accepts standard file
formats like step and unv.
Hope that helps. Your are welcome to disscuss anything in the regard
of FreeCAD on the forum http://forum.freecadweb.org/
Bernd
Zitat von Theler German Guillermo <[email protected]>:
Hi Bernd
I have already been trying to mesh a solid composed of more than one
FreeCAD parts with partial success.
As you can see in this previous thread
http://www.geuz.org/pipermail/gmsh/2015/009588.html
I was having the same problem you got in the first place: common faces
exported by FreeCAD are taken as different faces and FEM or FVM
computations are not possible.
I tried
Geometry.OCCConnectFaces = 1;
and it works on planar faces but fails with a segmentation fault on
other general faces. Christophe told me that the current algorithm only
works with plane faces, maybe someone more familiar with OCE may
implement a better algorithm.
BTW, it always seemed a pitty to me that FreeCAD cannot embed Gmsh as an
API due to GPL vs LGPL :-(
Nevertheless, FreeCAD forks and execs calculix (which is a allowed as
stated in https://www.gnu.org/licenses/gpl-faq.html#GPLAndPlugins ).
Why does Gmsh cannot be treated in the same way so an external macro is
avoided?
--
Germán Theler :: CTO Ingeniería & TICs
CITES ? Centro de Innovación Tecnológica Empresarial y Social S.A.
Dirección General Sancor Seguros
Grupo Sancor Seguros
tel +54 3493 ?428 500 ? Int.: 3374
[email protected]
www.cites-gss.com - www.gruposancorseguros.com
On Wed, 2015-09-23 at 12:15 +0200, Bernd Hahnebach wrote:
Hi Dave,
thanks for the tipp regarding the gui and using the options over
there. I had not worked with the gui before. I did some teste with
some modells and the different options. I need to work more to get
used to the gui of GMSH. Up to date it worked out well for some models.
I have a further question in this regard. What would be needed for
beam or solid meshes ?
beam meshes (or edge meshes) --> connect the edges where they share
the same vertice --> ?
shell mehes --> connect the faces where they share the same edge -->
-string "Geometry.OCCSewFaces=1;"
solid meshes (or volume meshes) --> connect the solids where they
share the same face --> ?
I could provide steps if needed.
Kind regards Bernd
Zitat von David Colignon <[email protected]>:
On 22/09/15 08:03, Bernd Hahnebach wrote:
Hi David,
thanks for the fast reply. It is what I would like to have connect
the faces if they share an edge. Yes the provided option
seams to do the trick.
-string "Geometry.OCCSewFaces=1;"
It worked on the simple provided part compound_of_faces.step and on
one with 10 faces beam-10faces.step. With bothe the FEA
worked out very well :-) On a more sophisticated part
mechanical-part.step it seam to work out too but I get non positive
jacobian during FEA, but that seams to be another part of the story.
Hi,
for more complicated parts, you should also open your step file
directly with Gmsh, and try the other options "Remove degenerated
edges and faces", "Remove small edges", ... in Tools -> Options ->
Geometry -> General and also look at the Info messages.
Regards,
Dave
Downloadlink is still:
https://cloud.woelkli.com/public.php?service=files&t=1cfd13febed7694726b902cdb36476d4
I need to test on more examples. I will report back.
kind regards bernd
Zitat von David Colignon <[email protected]>:
Hi Bernd,
can you try with adding the
-string "Geometry.OCCSewFaces=1;"
option ?
This should work with relatively simple geometries, i.e. faces
sharing a common line.
Regards,
Dave
--
David Colignon, Ph.D.
1er logisticien de recherche
Université de Liège
ACE - Applied & Computational Electromagnetics
Sart-Tilman B28
10, Grande Traverse
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
http://www.ulg.ac.be/nic4
On 21/09/15 19:25, Bernd Hahnebach wrote:
Hi there,
This is my first post to the mailing list so I may introduce
myself first. The "identifier" given to
me by my parents is Bernd and this corresponds to what most
people call myself. The bred to feed
myself an my familiy I earn in an engineering office near Zuerich
in Switzerland. I'm structural
engineer in the building industry. In my spare time I develop on
the FEM Workbench and on the Arch
Workbench of the parametric open source cad plattform FreeCAD.
This is why I'm gone write to this list.
FreeCAD uses for internal parametric surface and solid meshing
netgen. AFAIK due to licence
incompatibility between FreeCAD and GMSH it has never been an
option to use GMSH instead. But there
exists a FreeCAD macro which uses the GMSH installed on ones
computer for meshing. Most users mainly
use this GMSH macro for meshing their models including myself.
The macro exports a *.step meshes
with GMSH and imports the *.unv mesh back into FreeCAD. Babbled
enought,the important part of the
post ...
I run into trouble with meshing compunds of faces. The faces
where not connected to each other and
thus a Finite Element Analysis will fail to work without manual
connection off all the faces of the
compund. As a example a very simple compund of just two faces is taken.
mesh command:
gmsh compound_of_faces.step -3 -format unv -o
compound_of_faces.unv -algo netgen -clmax 100,00
-order 2 -optimize
gmsh --version
2.8.5
on Debian Jesie
I was wondering if it is possible to tell GMSH to mesh a
connected Surface Mesh of a compund of faces?
The files could be downloaded here:
https://cloud.woelkli.com/public.php?service=files&t=1cfd13febed7694726b902cdb36476d4
Kind Regards and thanks to all people who have ever contributed
to GMSH development.
Bernd
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