> On 17 Apr 2019, at 11:27, Jackman, K, Dr [[email protected]]
> <[email protected]> wrote:
>
> Dear Christophe,
>
> The advice you gave me in the previous email solved my problem. Thank you.
>
> However, I have noticed a new problem when creating an "internal" surface
> within a volume. I am using "Line{…} In Surface{…}" to link the lines of an
> "internal" surface to the boundary surface of a volume. This seems to work
> fine for most cases, but under certain circumstances the "internal" surface
> is not properly connected. More specifically, some of the nodes are connected
> to the triangles of the "internal" surface, but not the tetrahedral mesh.
You also need to embed these surfaces in the volumes, using "Surface{...} In
Volume{...};".
Christophe
>
> I have attached the geometry and mesh files, including an image, to
> demonstrate the problem. Nodes 605, 606, 1067 and 1068 are connected to the
> "internal" surfaces, but not the tetrahedral mesh.
>
> Hopefully, this is just a simple mistake in my geometry file.
>
> Best regards,
> Kyle
> From: Christophe Geuzaine <[email protected]>
> Sent: Monday, 08 April 2019 6:25 PM
> To: Jackman, K, Dr [[email protected]]
> Cc: [email protected]
> Subject: Re: [Gmsh] Possible Error in Tetrahedral Meshing
>
>
>
> > 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
>
>
>
> <files.zip>
—
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine
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