Different results based on the version of Ansys

- August 17, 2023 at 7:44 pm
  
  Margarita Khramova
  Subscriber
  
  Hello,
  I ran the exact same model in Ansys 2023 R1 and Ansys 2021 R2, and it gave me different results.I'm working with transient structural analysis involving a lot of contact conditions.
  Does anyone have any idea why that would happen?
  Thank you,
  Rita
- August 21, 2023 at 9:57 am
  
  Aniket
  Ansys Employee
  
  Hi Rita,
  The difference could be due to small changes that happen in algorithm over versions. To get to the root of the issue, make sure that you are using the same mesh that you used in the older version (This can be done by opening the old saved project with results and then clearing the results and rerunning them in the newer version), and use the same number of cores and then check the difference in results.
  When we have physical or numerical instability, this type of behavior is expected. We document this in the following locations:
  4.6. Troubleshooting (ansys.com)
  2.2. Troubleshooting (ansys.com)
  Please check the last paragraph for both pages. This sort of behavior is most commonly seen in nonlinear static or transient analyses which are numerically unstable and using different cores to solve can give slightly different results.
  -Aniket
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