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[GiDlist] 3D meshing problem with inner surface
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Send by: Enrique Escolano
On: Fri Mar 25 19:03:28 CET 2011



Re: [GiDlist] 3D meshing problem with inner surfaceMaybe this is a kind of graphical mistake using ElmerGUI and do you really have separated boundaries, or Elmer did some kind of nodes collapse when importing the .unv written by GiD.

If do you have in GiD geometry for two volumes 'duplicated- non shared surfaces', then when meshing you will have non-shared nodes (you can see it as you said showing mesh boundaries)
and when exporting this mesh with the .unv template you will maintain this topology.

In any case, don't export only the GiD mesh to Elmer using unv I-deas format!! 
It exists a 'elmer.gid' problemtype that you can download at the Elmer webpage: http://www.csc.fi/english/pages/elmer/interfaces

Follow the instruction of this page to use Elmer with GiD, 
then you will assign the conditions directly inside GiD and start the Elmer calculation pressing the GiD calculate button.

Enrique Escolano
  ----- Original Message ----- 
  From: Zenker, Dr. Matthias 
  To: gidlist at listas.cimne.upc.edu 
  Sent: Friday, March 25, 2011 12:52 PM
  Subject: Re: [GiDlist] 3D meshing problem with inner surface


  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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