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by joha2
Fri Aug 23, 2019 6:32 am
Forum: FEM
Topic: Fenics as Solver
Replies: 227
Views: 24764

Re: Fenics as Solver

I found a problem with the XDMF export. If GMSH creates 2nd order elements they are exportet with <TopologyType="tet_10"> which brings the XDMF importer of fenics to crash. It is also not XDMF compliant. It does work with 1st order elements as this exports<TopologyType="tetrahedron"> which is suppo...
by joha2
Sun Aug 04, 2019 2:14 pm
Forum: Users Showcase
Topic: Making CNC Machine
Replies: 8
Views: 1449

Re: Making CNC Machine

Now I am designing a CNC machine. Nice one! Keep up the good work! There is a another CNC machine project on github, with a 3 axis setup, comparable to yours: https://github.com/bcndynamics/MaduixaCNC If you don't know it already, it is maybe a useful source of information. The intention for this d...
by joha2
Fri Aug 02, 2019 7:20 pm
Forum: FEM
Topic: Topology optimization
Replies: 67
Views: 16816

Re: Topology optimization

I have written my own optimizer which is open source. (in python) In this case i use calculiX for solving the physical equation. You can optimize any problem and model which run on calculiX. There are different types of optimization: Maximize Heat-Exchange. Maximize Stiffnes. Multi physic topology ...
by joha2
Thu Aug 01, 2019 6:07 am
Forum: FEM
Topic: Buckling and Free Vibrations (without integrals or matrices)
Replies: 2
Views: 263

Re: Buckling and Free Vibrations (without integrals or matrices)

Nice one! Thanks @HarryvL! :D
by joha2
Wed Jul 31, 2019 6:20 pm
Forum: FEM
Topic: Compliant mechanism (FEM / Python)
Replies: 11
Views: 505

Re: Compliant mechanism (FEM / Python)

Right now, this is just a random meshing. The optimizer will create or fill the holes, so that the bending is more following the desired curve (which is not included right now). What is weird in your picture: The upper row and the right most column have to be fully filled like in my picture. Did yo...
by joha2
Wed Jul 31, 2019 4:22 pm
Forum: FEM
Topic: Fenics as Solver
Replies: 227
Views: 24764

Re: Fenics as Solver

I am still interested in Fenics + FC. Good to hear that... I once again searched a click-and-play alternative to comsol and finally ended up with fenics but it is not ready to do a quick study on a complex geometry within 5mins Please let me know if you have anything to test. BR, HoWil Yeah, they a...
by joha2
Tue Jul 30, 2019 5:36 pm
Forum: FEM
Topic: Fenics as Solver
Replies: 227
Views: 24764

Re: Fenics as Solver

For all still interested in using fenics in combination with FC .... I found this nice tutorial (using FC only for the geometry, and gmsh for creating the mesh externally) and thought sharing could maybe help somebody https://comphysblog.wordpress.com/2018/08/26/3d-electrostatics-using-fenics/ Nice...
by joha2
Sat Jul 27, 2019 8:54 pm
Forum: FEM
Topic: Gmsh error: Unknown element type for UNV export (MSH type 15)
Replies: 28
Views: 1355

Re: Gmsh error: Unknown element type for UNV export (MSH type 15)

bernd wrote:
Sat Jul 27, 2019 7:32 pm
might be because geo file includes Mesh.SaveAll option ... http://gmsh.info//doc/texinfo/gmsh.html ... cal-groups ?
Setting Mesh.SaveAll = 0; does not change anything. The error message remains. :-(
by joha2
Sat Jul 27, 2019 9:18 am
Forum: FEM
Topic: Gmsh error: Unknown element type for UNV export (MSH type 15)
Replies: 28
Views: 1355

Re: Gmsh error: Unknown element type for UNV export (MSH type 15)

good idea johannes, another possibility would be a post to gmsh mailing list. I investigated what I wrote yesterday and it seems that the node 15 elements are just the vertices from the geometry. I generated a fusion object by fusing together sphere, cube, torus, cone and meshed it with gmsh 4.3.0....
by joha2
Fri Jul 26, 2019 6:23 pm
Forum: FEM
Topic: Gmsh error: Unknown element type for UNV export (MSH type 15)
Replies: 28
Views: 1355

Re: Gmsh error: Unknown element type for UNV export (MSH type 15)

... I thought, it is just an incompatibility in gmsh where single node elements are created and the UNV export - which is necessary for the communication with FreeCAD - cannot "write them out". At the end of the day the MSH type 15 elements are not exported ... This leads to the question, "What is ...

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