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Old   April 29, 2008, 14:03
Default Surface Repair for Meshing
  #1
Andy R
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Folks, We normally run classes of problems with tractable bottom up geometry which we mesh in a straightforward fashion using Gridgen, ICEM or Gambit as appropriate.

We are now running into problems where we get cad geometry which is simply not going to work out of the box. These are underhood, external aero type problems but they are not automotive. Cant say more.

As an ex-adapco Prostar user, I would have used ProAm or whatever its called now and wrapped the surface to get a contiguous surface for meshing.

Whats the state of third party tools that perform these sort of functions? I see that ANSA is still a playere here. Any other tools that can do this? Any that are cheap or free ;-)

Thanks - Andy
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Old   April 29, 2008, 15:44
Default Re: Surface Repair for Meshing
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Will
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the star-ccm+ wrapper is very good for this kind of stuff, we use it to prepare full underhood geometries, it is a lot lot easier to use than proAM too..
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Old   April 29, 2008, 16:35
Default Re: Surface Repair for Meshing
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Alex
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on a related note for Andy, is your software now capable of unstructured stuff or tets? i remember a while back it was structured cartesian....
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Old   April 30, 2008, 10:49
Default Re: Surface Repair for Meshing
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Andy R
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For low speed stuff we use fluent, so when we need to we can run a tet mesh - Andy
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Old   April 30, 2008, 11:02
Default Re: Surface Repair for Meshing
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myron
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I believe ICEM also has a 'wrapper' - Look under Geometry > Create/Modify Surface > Geometry Simplification.
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Old   April 30, 2008, 12:32
Default Re: Surface Repair for Meshing
  #6
Chris
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Gridgen has a capability called quilts and solid modeling.
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Old   April 30, 2008, 18:01
Default Re: Surface Repair for Meshing
  #7
paulh
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Check out Materialise from 3-Matic or Harpoon from Sharc. Both will wrap - Harpoon will also give you a fluid grid. I have no experience with Materialise - I've just seen the advertisements. Harpoon was pretty good when I looked at it. CCM+ is very good. Hypermesh is also very good at cleaning up, and even making simple, geometry. Its surface mesh is pretty good as well.

paulh
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Old   May 1, 2008, 16:10
Default Re: Surface Repair for Meshing
  #8
BastiL
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ccm+ wrapping is pretty good but volume meshing is poor....
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Old   May 1, 2008, 16:56
Default Re: Surface Repair for Meshing
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Will
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I disagree, the volume meshing is great if you know what you are doing, what do you mean by poor?
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Old   May 2, 2008, 03:52
Default Re: Surface Repair for Meshing
  #10
BastiL
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For more simple geometries maybe... For really complex ones I have to remove thousands of "invalid" cells to get it running. However, sometimes it fails. Take the mesh to ProSTAR 4 and search for concave or centroid cells - in really complex geometries (full cars) you will find lots of poorely shaped strange looking cells. This happens for both Polyhedral and trimmed meshes. Tetra is ok.
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Old   May 2, 2008, 13:29
Default Re: Surface Repair for Meshing
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Will
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How odd, I have never had that many problems and I have wrapped and volume meshed full underhoods, are you sure you are using the latest version?
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Old   May 3, 2008, 09:09
Default Re: Surface Repair for Meshing
  #12
BastiL
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No longer. We have switched to other codes. However, we saw that problems up to version 2.08. Did you check your mesh? ccm+ has a very stable solver and sometimes runs on theses dirty meshes.... Seems like some internal solver tricks to handle theses cells....
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Old   May 3, 2008, 12:53
Default Re: Surface Repair for Meshing
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Will
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The meshing did take a step forward after 2.08, there is also a bad cell treatment option now, the hex mesher is really quick

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Old   May 3, 2008, 14:33
Default Re: Surface Repair for Meshing
  #14
BastiL
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I can not try anymore. We went to another tool which we are more happy with. I no longer have ccm+ licences.
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