Doubt of stability, convergence and steady-state.

- March 29, 2022 at 11:40 am
  
  nep
  Subscriber
  
  Hello,
  I attachment the results that i have in a process steady-state . With this results (unchecked residual checks) the residuals appear stable and the temperatures appear that it looks like they are going to continue like this. My doubt is:
  With these results, can I consider that the model is correct?
  Can I consider that the process has stabilized and is stationary?
- March 29, 2022 at 1:59 pm
  
  Nikhil Narale
  Ansys Employee
  
  Hello,
  
  Ansys employees are not allowed to download any attachments from here. Can you please post the screenshots in the comment section directly?
  
  Nikhil
- March 29, 2022 at 2:03 pm
  
  nep
  Subscriber
  
  I'm sorry, i think i attach as image.
  The pictures were:
  Thank you
- March 29, 2022 at 2:37 pm
  
  Rob
  Ansys Employee
  
  You had attached the images, we're having problems loading stuff on this side. I think IT are messing with things they shouldn't....
  The residuals aren't converged, but suggest the solution isn't changing much. However, as the monitors are still changing I wouldn't trust the results. Are you monitoring any other points, and velocity anywhere?
- March 30, 2022 at 9:45 am
  
  nep
  Subscriber
  
  My system was a steel plate to which solar radiation is incident. I have also simulated the heat transfer which is the second variable I'm interested in after the plate temperature, and it seems that the heat transfer is stable, I introduce image:
  Do you think my model would be correct?
  Maybe the temperature should stabilize horizontally as it's steady state, but on the other hand FLUENT does not stop radiating 887 w/m2 , so it would be logical that the temperature continues to increase as in the first graph I think...
  Could you help me please? to know if it's right.
  Thank you very much for your help
- March 30, 2022 at 11:03 am
  
  Rob
  Ansys Employee
  
  I think it's still converging - the lines look flat as they're not changing much. Give it another few hundred iterations and review then.
- March 30, 2022 at 12:54 pm
  
  nep
  Subscriber
  
  In 1000 iterations, the form is the same, appears:
  Can I consider that the process has stabilized? and, if it's true, as the temperature depends of the iterations, How many iterations i select?
  Thank you very much
- March 30, 2022 at 1:09 pm
  
  Rob
  Ansys Employee
  
  Until it stops changing. Have a look at the flow and temperature field to see what's going on.

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