Dear Christophe, Thank you! I can now see the thin tetrahedrons.
Also, thank you for the visualization tip! 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
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