Hi Matej. I am facing different issue.
My model:
I have a tubular structure where I apply the bolt pretension at a cross section just above the threads. Since it is a complex part, I use second order tet mesh with a boundary layer on both sides of the cross section.
Pre 2.3.0 I was able to select the surface and merge the part back into one and was able to run the simulation successfully. But the newer versions, I can only select the FE based surface like you suggested here. I set the pretension direction “auto-compute”.
Geometry based surface selection I get the pretension direction calculated by calculix
*INFO: pre-tension normal for surface BOLTLOAD-1
-4.5946230207038368E-018 1.6354628026558331E-016 -1.0000000000000000
which is purely in z-direction (x and y values are very small and negligible for my calculation)
FE based surface selection I get the pretension direction calculated by calculix
*INFO: pre-tension normal for surface BOLTLOAD-1
0.54178583594546259 -0.84051657209651520 0.0000000000000000
I am completely getting pretension in some other undesired direction.
So I did two things
- Either set the pretension direction manually in z direction for FE surface selection
- Or leave the split parts unmerged for geometry based surface selection
I am still getting some convergence issues while trying the workarounds which was not present in the older versions. The older version was more convenient, is it possible to bring it back?