www.gidhome.com

On: Fri Mar 25 12:52:31 CET 2011

Hi,

thank you for your answer. I now can see that my mesh has boundaries
with Mesh->View Mesh boundary. But when I export the mesh using the .unv
template, and open it with ElmerGUI, there still is only one boundary,
i.e. the outer surface of the geometry. What can I do to have all the
surfaces initially present in the geometry as separate boundaries, so
that I can assign boundary conditions in Elmer?

Thank you for more helpful hints.

Matthias Zenker 

Date: Thu, 24 Mar 2011 16:58:40 +0100
From: "Enrique Escolano" <escolano at cimne.upc.edu>
Subject: Re: [GiDlist] 3D meshing problem with inner surface
To: <gidlist at listas.cimne.upc.edu>
Message-ID: <C81B150245D742B58D139C5008A61E7D at mediador>
Content-Type: text/plain; charset="iso-8859-1"

3D meshing problem with inner surfaceThe volumes become connected,
because by default a collapse is automatically invoked after the import,
and the surfaces of both volumes were joined (and a single surface is
shared by both volumes).

You can disable it by setting: Utilities->Preferences... Exchange, and
unselect the 'Automatic collapse after import'

Note: a 'repair' is automatically invoked also, in this case if you
disable the collapse, can do the repair to fix some problem with
'Utilities->Repair Model", else some surfaces can't be rendered and
probably meshed.

The collapse can be also manually invoked with
Geometry->Edit->Collapse->Model

If the volumes were already joined, you can separate them using
Geometry->Edit->Uncollapse->Volumes
then the common entities (surfaces, lines and points) will be duplicated
to have each volume its own entity

Regards

Enrique Escolano
  ----- Original Message ----- 
  From: Zenker, Dr. Matthias 
  To: gidlist at listas.cimne.upc.edu 
  Sent: Tuesday, March 22, 2011 8:59 AM
  Subject: [GiDlist] 3D meshing problem with inner surface

  Hi, 

  I am new to GiD, evaluating it at the moment. I want to make a mesh
for the attached geometry (in Parasolid format, we are using Solidworks)
which has 2 bodies, one partially inside the other. So far, I did not
succeed in preserving the interface in the mesh. GiD seems to make just
a volume mesh so that I have a unique body with one boundary at the end.
But I need to have 2 bodies and a boundary between them for the FEM
simulation. 

  Can GiD do this kind of things, and if so, how do I achieve it? 
  A hint on how to proceed would be most welcome. 

  Thank you, 

  Matthias 

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ERBE Elektromedizin GmbH
Dr.rer.nat. Matthias Zenker
Dipl. Phys.
Grundlagenentwicklung / Fundamental Development
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72072 Tuebingen
Germany
Phone + 49 (0) 7071 755 - 226
Fax + 49 (0) 7071 755 - 5226
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