Learning Forum

[lutfiantoraihan]

Hi all, I have a simple problem like this.

This is a shaft subjected to a torsion load in the x-direction. The frictionless supports represent the bearing. I recently opened my old archives from R19.2 and it was working fine. However, when I re-run it in 2023 R2, pivot error happened.

I know that this model is not properly constrained, but my questions are:

1) Why was this model working in R19.2?

2) How can I sufficiently represent the bearing support so that it can be solved?

I can provide the .wbpz if needed. Thanks!

[Gary_S]

Hello,

Lets try : 

Analysis Settings > set Solver Pivot Checking to OFF and see if you get a solution. 

 

[lutfiantoraihan]

Hi Gary, thanks for your suggestion. I already tried to set the solver pivot checking to "off", but the error still happened. Any other suggestions?

[Gary_S]

On the Moment conditions, see if setting the Behavior property to Rigid or Coupled is helpful. (Default is Deformable).

[lutfiantoraihan]

I have tried to change it into "Coupled", the simulation was solved, but with no deformation at all Gary

[Gary_S]

 

  A general procedure for determining why a difference in results for different versions. 

 – Compare the solver input file (ds.dat) file generated from 19.2 to the solver input file generated from 2023R2.
    This can help narrow down any differences in solver settings etc. 

 – Compare the Solution Information (solve.out) file between verisons. Pay close attention to any differences in Warnings or Notes that might give a clue. 

 – Can you confirm the results obtained in 19.2 were accurate? Do the reactions match the input?