RE: [Libmesh-users] 3D tetrahedral element (TET4 TET10) unavailable?

[Kirk, B. \(JSC-EG\) <ben...@na...>]

libMesh's mesh generation utilities are pretty limited.  However, you
can always make a mesh with external software & read it in with one of
the many supported file formats.  I believe GMSH will create tet meshes
and is free.  Alternatively, you can use the libMesh interface to tetgen
to build a tet mesh for some predefined points (c.f.
http://www.tu-harburg.de/~sufp/LIBMESH_Beschreibung/index.html).

Bottom line, libMesh is an unstructured mesh analysis package which can
use a variety of mesh types.  There is a large array of finite element
preprocessing software available to actually *create* these meshes.  For
example, I routinely use Gridgen or Cubit to generate meshes.

If all you want to do is prove to yourself that the library can use tets
build a simple example which reads in one of the provided reference tets
(refrenece_elements/3D), uniformly refines it, and then computes on it.

-Ben



-----Original Message-----
From: lib...@li...
[mailto:lib...@li...] On Behalf Of David Xu
Sent: Wednesday, March 08, 2006 12:17 PM
To: John Peterson
Cc: lib...@li...; Roy Stogner
Subject: Re: [Libmesh-users] 3D tetrahedral element (TET4 TET10)
unavailable?

>  > I was testing TET4 and TET10 in my 3D code and I could compile it.
>  > When I ran it, I got:
>  >
>  > ERROR: Unrecognized 3D element type.
>  > [0] src/mesh/mesh_generation.C, line 671, compiled Mar  3 2006 at=20
> 00:17:16  > make: *** [run] Aborted  >  > And I looked at=20
> mesh_generation.C, line 671, there's no entry for  > TET4, TET10,=20
> Pyramid5, InfHex8, InfHex16, InfHex18, InfPrism6,  > InfPrism12 that=20
> are listed in the introduction.
>
> If you are building a mesh with the mesh_generation.C functions, I=20
> don't think tets are supported.  I think you can do hexes in 3D and=20
> quads/triangles in 2D if you use the internal mesh generator.
>
So, how should I build a mesh using TETs in libmesh or I can only do it
with extermal mesh generator? Libmesh has the header file such as
<cell_tet10.h>. Could you elaborate more?

Thanks,

David


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