Open PrasadBabarendaGamage opened 6 years ago
I think this goes back to what we have discussed during one of the conference calls.
It looked like the inconsistency in the iron and zinc/cmgui numbering schemes is causing this issue. This should probably be addressed by changing the export routine for quadratic tets.
Zinc/EX cycle all local nodes for all bases in xi1 fastest then xi2 then xi3. Iron uses Zienkiewicz winding for simplex elements. The attached image shows the local node ordering for quadratic tetrahedra with Cmgui/EX (centre) and Iron/Zienkiewicz winding; VTK quadratic tetrahedra winding is different again. All are the same for linear tetrahedra. Be careful when you export in the Cmgui/EX order that you look up the equivalent node in the Iron sequence from the diagram.
There is an issue with the quadraticTet mechanics example in the old examples repo. The model converges but the undeformed and deformed configuration look distorted. Unfortunately, have not had the time to investigate further. quadratic_tet_mechanics.zip
Potential steps for debugging: