Hi,
I am simulating a centrifugal compressor using the single passage method in Ansys.
The case file works correctly in Ansys 19, however, when I open the converged case and data file with Ansys 2021 R1 and continue the iteration process, a sudden jump occurs in the residuals and the final results also changes and wrong.
Can anyone help in this regard?
Thanks in advance.
Does resuming the calculation in ansys 19 work correctly? Also, does starting the simulation from scratch in ansys 2021r1 give you the same result as it did in ansys 19? Does resuming from a ansys 2021r1 result in ansys 2021r1 result in the jump, as well, or only when the initial results file is from ansys 19?
Dear Svetlana Tkachenko
Many thanks for your reply. Resuming the calculation in Ansys 19 works correctly.
Even when I initialize in Ansys 2021R1, the results are wrong.
What ANSYS licence are you using? Would it be possible to send the vendor a technical support request and attach your simulation files? If so, please share their response here.
Dear Morteza,
Ansys solver is going to be slightly different in each new version in terms of its input parameters. Once you heat the solve button, ANSYS gathers all these parameters from your model and creates a file (.dat) and consequently sends it to its solver.
Therefore, if you just resume an analysis which was started in an "old" version in a "new" version, then the new solver expects parameters from the old package that are slightly different or even doesn't exist. This causes a significant interruption in the solver.
I suggest you start over your analysis in the new version to avoid having inconsistency in solver parameters which can lead to a significant error in your simulation results.
Dear Hamidreza
Many thanks for your response.
I've initialized the solution in the new version, however, thr final results are wrong and differ from the old version.
Dear Claudio Pedrazzi
I appreciate your response. The mesh are the same in both versions.
The idea of comparing the *.dat files is interesting.
When should the data files be compared? After initializing?
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