Learning Forum

[jpsinger]

Hi,

I've been teaching ANSYS for about the past 5 years and each time multiple students run into a bug where parametric sweeps of Fluent give the same results for each design point. It's the same thing from this post:
https://innovationspace.ansys.com/forum/forums/topic/getting-same-output-values-for-different-values-of-parameters-in-workbench/

And this forum from a decade ago:

https://www.cfd-online.com/Forums/fluent/125869-getting-same-output-values-different-values-parameters-workbench.html

There are various workarounds in terms of setting each solution to current and going into the solution manually to force an update, but no solution. I wanted to check in to see if there were any true fixes in this the year 2024...

Best,

JPSinger

[Rob]

The main fix is to change the check interval to about 5 so prevent convergence in the first iteration(s). Fluent has a built in parametric function now, but the process is also moving over to Optslang and attached tools to add in Digital Twin and similar functionality. 

[jpsinger]

Hi Rob, I wanted to follow up on where I could find the check interval as I feel like I'm quite close to resolving this issue. Thanks!

[jpsinger]

Would this be the Reporting or Profile Update Intervals in Fluent? The only Check Interval I can find in Workbench is in Mechanical options. I'd prefer to run everything through Workbench since we use multiple solvers.

[Rob]

Reporting Interval, and it's set in the Fluent Solve panel.  

Fair enough re multiple solvers. I cover Fluent and Rocky at a much lower level of expertise. Neither use Workbench for coupling or "normal" use. 

[jpsinger]

Thanks Rob. I haven't even heard of Rocky... So many products!

[Rob]

And so many applications to model with them!