Elmer Discussion Forum

Matthias,

After repeating the steps you outlined and using the correct .sif I got the same correct result as you with no degenerate elements!

So the solution is to use ElmerGrid -autoclean and work in the commandline, without using ElmerGUI.

Thank you so much for your help!

Regards,
Mustafa.

Matthias,

That is great!

I use Windows 10 64 bit, Elmer 8.2 and GMSH 2.16.

Thanks,
Mustafa.

Matthias, I had the same result, it seems the .sif file was incorrect. Please try pasting this code into the .sif file and running again, then you may see the degenerate elements that I do. Header CHECK KEYWORDS Warn Mesh DB "." "." Include Path "" Results Directory &qu...

Matthias, I ran the .sif file in ElmerSolver (non GUI) and left it to run. It finished after over 20 minutes, with mostly degenerate elements filling the log. ResultOutputSolver: ------------------------------------- ResultOutputSolve: Saving with prefix: 1_5 ResultOutputSolver: Dimension of mesh: 2...

Matthias,

This is the .sif file used, it should be the same one you used.

Thanks,
Mustafa.

Matthias, The correct case does not have 0 concentration everywhere, there is a bulk concentration at the top boundary, 0 concentration at the slanted surface (conical electrode) and no flux on the other 3 boundaries. I am surprised you don't get the error, I just repeated the same steps you did (El...

Dear Matthias,

Please find the meshes and Elmer files attached, thanks.

Pavel I've seen issues with degenerate elements in 3D meshes, have you tried using "Optimise 3D" and "Optimise 3D (Netgen)" in GMSH?

Thanks,
Mustafa.

Matthias, I have posted on a GMSH forum and will see if the issue can be resolved. Please the the attached image which shows a zoomed region of the conical apex in ElmerGUI after importing the original .msh from GMSH. Running this I get the degenerate elements in the solver, but the elements seem fi...

Matthias,

On inspection I see that there are overlapping nodes. The black horizontal lines with 0 inner radius coincide with the green triangles in the region close to the apex. I am working in the xy plane already.

Any ideas on how to stop Elmer from struggling with my mesh?

Thanks,
Mustafa.

Matthias,

I successfully converted the Elmer mesh (used -autoclean) back to .msh and looked at it in GMSH, and can see the degenerate elements as you can also see in the attached picture. What can I do to resolve this issue?

Many thanks,
Mustafa.