[Gmsh] Reading element type 118 of I-deas universal mesh files?

[David Colignon]

Takuya OSHIMA wrote:

> Hi there,
> 
> We are trying to use Gmsh 2.3.1 on Linux in order to convert an I-deas
> universal mesh that comes with Code_Aster 9.4, ahlv100j.msup (that can
> also be found as a gzip-compressed attachment to this mail), to the
> Gmsh .msh format for validating against Code_Aster our own FE code
> that only supports the Gmsh format. The I-deas mesh mostly consists of
> elements of type 118 (10-node 2nd order tetrahedra).
> 
> However, if we load and convert the I-deas mesh with Gmsh we see the
> connectivity is somewhat broken (beforeFix.png), whereas the
> connectivity looks fine (afterFix.png) if we modify
> Geo/GModelIO_Mesh.cpp as the attached GModelIO_Mesh.cpp.diff.
> 
> Our guess is that either the point ordering of the I-deas mesh file or
> the I-deas mesh reader in GModelIO_Mesh.cpp is incorrect, but we could
> not draw a definitive conclusion because we could not find a
> documentation about the I-deas mesh format on the net.
> 
> Does anybody have an idea about this problem?

Hi Takuya,

the problem is that it is indeed very difficult to find a reliable documentation about the I-deas mesh format and the 
right point ordering... Some software make different choices and this introduce incompatibilities... It is possible that 
we made a mistake in Gmsh, we will certainly take your patch into account.

Cheers,

Dave


-- 
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
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Université de Liège
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> 
> Thanks,
> Takuya
> 
> Takuya OSHIMA, Ph.D.
> Faculty of Engineering, Niigata University
> 8050 Ikarashi-Ninocho, Nishi-ku, Niigata, 950-2181, JAPAN
> 
> 
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