Hi Alex, I just looked at your .mcf. The correct cylinder composite IDs = 1,2,3,4 . You can use NekMesh -extract:surf=1,2,3,4 to make sure these are the right one. I just changed that in your session filed and it ran smoothly. Is this what you are trying to achieve ? Kind Regards, Kaloyan [cid:9db983f1-24d5-4216-bb13-b1035f662b64] PS: Please be aware, when you use STEP, OpenCascade assigns its own composite IDs based on location. ________________________________ From: nektar-users-bounces@imperial.ac.uk <nektar-users-bounces@imperial.ac.uk> on behalf of Alexander Schukmann <alexander.schukmann@protonmail.com> Sent: Tuesday, June 18, 2024 10:13 PM To: nektar-users <nektar-users@imperial.ac.uk> Subject: [Nektar-users] NekMesh: Mesh generation not working This email from alexander.schukmann@protonmail.com originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list<https://spam.ic.ac.uk/SpamConsole/Senders.aspx> to disable email stamping for this address. Hello everyone, since NekMesh doesn't seem to like my 3D mesh generated with ICEM and Gmsh (see thread "NekMesh: Inconsistent triangular face orientation"), I tried creating it directly with NekMesh by using a mesh configuration file or mcf ("mesh_configuration_file.txt"). However, this doesn't properly work either when I activate the boundary layer refinement or blr feature. I attached all the necessary files converted to txt. I provided the geometry as *.step ("cylinder_geom_step_file1.txt") to the mcf and it works without blr. As soon as I switch on blr it throws the following warning, aborting the volume meshing process: Fatal : Level 0 assertion violation not setup for curve bl refinement [InputMCF] WARNING: Volume meshing has failed with message: [InputMCF] WARNING: Level 0 assertion violation not setup for curve bl refinement [InputMCF] WARNING: The linear surface mesh be written as a manifold mesh If I include all the domain boundaries except for the two side faces along the cylinder axis, i.e. writing <P PARAM="BndLayerSurfaces" VALUE="1,2,3,4,6,7,8,9" /> with 5 and 10 being the two side faces, it works. But obviously, I only need blr on the cylinder surface and not anywhere else. In a second attempt I loaded the geometry into Gmsh first, defined all the physical groups ("geo_file.txt") and again exported as *.step ("cylinder_geom_step_file2.txt"). This doesn't work at all, neither with nor without blr activated in the mcf and produces the following warning before crashing entirely: Fatal : Level 0 assertion violation surface mesh connectivity error [InputMCF] WARNING: Surface meshing has failed with message: [InputMCF] WARNING: Level 0 assertion violation surface mesh connectivity error [InputMCF] WARNING: Any surfaces which were successfully meshed will be written as a manifold mesh. [InputMCF] - Elapsed time: 4.78223s. [OutputNekpp] Writing Nektar++ file 'CylReD3900_3D_G1.xml' Fatal : Level 0 assertion violation Connected edges do not share a vertex. Edges 2347, 2345 terminate called after throwing an instance of 'Nektar::ErrorUtil::NekError' what(): Level 0 assertion violation Connected edges do not share a vertex. Edges 2347, 2345 Any help is very mush appreciated. All the best Alex Sicher versendet mit Proton Mail<https://proton.me/>.
