Rob
Ansys Employee
Are both results fully converged? R15 is fairly old, and significant changes were made in the solvers, you'll also see R15 was (probably) run using SIMPLE as opposed to PBCS in 2020. I don't expect such large differences (and we run tests to confirm this) in well posed problems, but if one or other didn't converge well you would expect some change in the result. n
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