thschrader wrote: ↑Wed Aug 17, 2022 2:57 pm
How can I do geometry changes in elmer GUI?
As I wrote, a loop between designing and analyzing would be FreeCAD's strength because Comsol and Co. only support to lead in a STEP file.
This thread is not meant to discuss what solver is the best. CCX can do multiphysics as well as Elmer. But that dos not help us when we don't provide a proper model change loop.
For many applications, to get the results you need you use CCX or Elmer directly. Since FreeCAD will never be able to be as feature-complete as these solvers.
thschrader wrote: ↑Wed Aug 17, 2022 2:57 pm
Loading a new stp-file from FC? This brakes the model, you start again.
Does not happen here. I just have to remesh to update the mesh t the new geometry.
thschrader wrote: ↑Wed Aug 17, 2022 2:57 pm
In elmer GUI you have no visual presentation of forces/fixings like in FC
Its VTK visualization is even better than ours. For example the iso-area view is very useful. Adding this VTK feature for FreeCAD is therefore on my ToDo as well.
If you mean the highlighting of faces where forces act, I think i see that this is possible in Elmer too. However in FreeCAD we miss this feature for several constraints (all Python-based contraints like flow and potential)
thschrader wrote: ↑Wed Aug 17, 2022 2:57 pm
I did the flange calculation with ccx and elmer. Deformations are nearly equal,
but stresses are different, 480 MPa ccx vs 320 MPa elmer. Used elmerGrid an Umfpack solver.
But elmer runs faster, 19 sec vs 50 sec ccx.
I don't know enough but how are the results normed? What stress did you calculate. vonMises results are relative to itself as I understood it. So its maximum is not important but the difference between the min and max.
In general, to work with a solver, one need to invest time to check what settings have to be done. If you give me your particular file (also your Elmer project files) I can as k in the Elmer forum. Maybe we need to do the norming in FreeCAD like for the Eigenvalues results.
thschrader wrote: ↑Wed Aug 17, 2022 2:57 pm
Sooo... ccx is the first choice for me in daily work.
Yes. As I wrote above, this thread is not about what solver is better. Depending on your uses cases you will decide what to use.
What is important is that for CCX we have a major drawback that
- we only support its thermomech capabilities
- whenever I re-run the solver because made a change i the setup, the mesh or design, I have to rebuild my result pipelines to get the result info I need. This issue if for me the main blocker because it kills the workflow.