> On 8 Apr 2019, at 17:59, Jackman, K, Dr [[email protected]]
> <[email protected]> wrote:
>
> Dear Christophe,
>
> Thank you for your prompt reply.
>
> I can successfully mesh the geometry file with Gmsh, without any errors, but
> the tetrahedral mesh does not seem to be correct at some locations. The faces
> of some tetrahedrons (please see attached images) are not aligned correctly,
> and therefore, not properly connected. I have attached the mesh file and some
> images to demonstrate the problem.
The mesh you sent is correct; but it has some fairly flat tetrahedra
("slivers") that the optimizer could not remove. This is to be expected for a
mesh with two very close surfaces - with different meshes on both sides. For
such geometries you would get better results by extrusion, making sure that the
meshes on the two surfaces "match".
To visualize the poor-quality elements, you can either use
Tools->Options->Mesh->Visibility and enter e.g. [0,1e-4] for the Gamma range ;
or use Tools->Statistics and click "3D" for the quality you are interested in.
Christophe
>
> Best regards,
> Kyle
>
>
> From: Christophe Geuzaine <[email protected]>
> Sent: Monday, 08 April 2019 3:30 PM
> To: Jackman, K, Dr [[email protected]]
> Cc: [email protected]
> Subject: Re: [Gmsh] Possible Error in Tetrahedral Meshing
>
>
>
> > On 8 Apr 2019, at 12:47, Jackman, K, Dr [[email protected]]
> > <[email protected]> wrote:
> >
> > To Whom It May Concern,
> >
> > I have noticed some errors in the tetrahedral meshes, generated by Gmsh
> > (both v3.0.6 and v4.2.2). Under certain circumstances, e.g. volumes with
> > holes, some tetrahedron elements do not align with adjacent tetrahedrons.
> > An example is attached that demonstrates this error, including images that
> > show the location of the edges that do not connect.
> >
> > I have tried several geometric examples, including meshing algorithms
> > (surface and volume), but this does not fix the problem. The attached
> > example seems to work when selecting “Mesh.Algorithm = 2;”, but this is not
> > always the case for other geometries.
> >
> > Hopefully, this is just a simple mistake in my geometry file.
>
> The file you sent meshes fine here will all the algorithms. Can you send the
> .msh file that you think is wrong?
>
> Christophe
>
> >
> > Best regards,
> > Kyle
> >
> >
> > The integrity and confidentiality of this email are governed by these
> > terms. Disclaimer
> > Die integriteit en vertroulikheid van hierdie e-pos word deur die volgende
> > bepalings bereël. Vrywaringsklousule
> > <Gmsh_error_overview.zip>_______________________________________________
> > gmsh mailing list
> > [email protected]
> > http://onelab.info/mailman/listinfo/gmsh
>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://www.montefiore.ulg.ac.be/~geuzaine
>
>
>
> <mesh_file_and_images.zip>
—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
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