> On 25 May 2018, at 16:26, Quentin Goestchel <quentin.goestc...@ens-cachan.fr> > wrote: > > Dear Sir or Madam, > > I would like to thank you for the great work which has been done to develop > the open-source Gmsh software. > I am currently working on a 3D numerical method and I think I have found a > bug in the 3D meshing algorithm. I was trying to generate a transfinite bulk > in a mesh (to have a constant orthogonality of the elements), and an > unstructured layer around it, as shown in the enclosed > "sphereTransfinite.png". >
This is "normal" the (non-recombined) 3D transfinite algorithm does not try to enforce the compatibility between the volume and surface meshes. It's actually impossible without modifying the 2D mesh a posteriori in some configuration (since we also generate the 2D mesh first). You should specify the corners of the transfinite interpolation in the right order to have the match. PS: Using Extrusion instead of Transfinite, Gmsh will try to perform the modifications automatically. > Everything was going fine until I noticed a big error on my discretized > spherical surface, computed with the sum of the areas of the boundary faces. > I found out that my code was unable to find the neighbours of many > tetrahedrons around the bulk mesh because many faces were not matching but > crossing each other edges, as shown in sphereTransfinite_err.png . > I didn't find any topics about such problem so I assume that you didn't know > about it, but I might be wrong. > Best regards, > -- > Quentin Goestchel | Etudiant - Année ARPE > Département Génie Civil > +33(0)6 83 75 57 53 <tel:+33683755753> | > quentin.goestc...@ens-paris-saclay.fr <mailto:prenom....@ens-paris-saclay.fr> > ENS Cachan - 61 avenue du Président Wilson 94235 Cachan CEDEX > <geo://?q=61+Avenue+du+Pr%C3%A9sident+Wilson+Cachan+France> > www.ens-paris-saclay.fr <http://www.ens-paris-saclay.fr/> > <imblgnlknopffhfn.png> > <http://www.ens-paris-saclay.fr/><sphereTransfinite.png><sphereTransfinite_err.png><sphereTransfinite.geo>_______________________________________________ > gmsh mailing list > gmsh@onelab.info > http://onelab.info/mailman/listinfo/gmsh — Prof. Christophe Geuzaine University of Liege, Electrical Engineering and Computer Science http://www.montefiore.ulg.ac.be/~geuzaine Free software: http://gmsh.info | http://getdp.info | http://onelab.info
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