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Old   November 9, 2006, 12:48
Default grid generation
  #1
alessio
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Hi,

I'm looking for a software/algorithm of mesh generation capable to start from a triangulated surface and to "extrude" a grid from it. I'd like to decide the thickness and the number of tetrhaedra's layers in the extrusion. Does anyone know anything related to this?

Thanks, Alessio
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Old   November 9, 2006, 13:22
Default Re: grid generation
  #2
rt
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look at VGRID site: http://www.vigyan.com/vgrid.shtml#CONTACTS

probably advancing front/layer method can be candidate.
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Old   November 11, 2006, 12:53
Default Re: grid generation
  #3
John Chawner
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Pointwise's Gridgen software can extrude prisms from a tri surface mesh. This capability is available in the current production code.

In the next release, due out very soon, we've added anisotropic tetrahedral extrusion. Starting from a tri mesh, high aspect ratio (anisotropic) tets are extruded. These tets have an included right angle and can be very flat.
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Old   November 13, 2006, 15:51
Default Re: grid generation
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phsieh2005
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Try gmsh - Open Source.

You can extrude from tri elements to get prisms (can specify distance and number of layers). You can also combine the tri elements into quad elements before extrusion. In this case, you get both prism and Hex.

another one is salome - you can import STEP file.

phsieh2005
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Old   November 13, 2006, 15:57
Default Re: grid generation
  #5
alessio
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This is awesome since I've already written a converter from the gmsh format to my format!

Is there then a way to obtain tetrahedra from the prisms?

Thanks a lot, Alessio

PS Unfortunately I don't think that at this stage I can effort a non-free meshing tool, but I'll make an effort if necessary.

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Old   November 14, 2006, 09:29
Default Re: grid generation
  #6
phsieh2005
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Hi, Alessio,

What is the purpose of extruding tri- to get Tet elements? In gmsh, you can extrude the surface to get volume, then, mesh the volume. In this way, you get all tet elements.

Salome is Open Source. It reads STEP format, and can save to I-DEAS unv format (it can read unv format too): www.salome-platform.org. It only runs on Linux at this point.

phsieh2005
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Old   November 14, 2006, 09:54
Default Re: grid generation
  #7
alessio
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Hi

thanks for the answer. The purpose is to make the creation of a mesh simple for 3D artists who want to use my software. They usually have models defined with triangulated surfaces and my pde tool does not support any other geometry rather that tri/tet. Therefore I think the best solution would be to have the possibility to extrude the existing surface (I'm talking about i.e. a bodywork mesh in a fluid-structure interaction).

best wishes, Alessio
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