How to fix fluent mrf simulation continuity divergence after 1400 iterations?

- March 28, 2022 at 8:33 am
  
  rm8
  Subscriber
  
  Good morning,
  I was performing a frozen rotor simulation of a centrifugal fan (D = 150 mm). The simulation showed a slow but steady convergence for 1400 iterations, and then it suddently diverged.
  The domain is divided in three parts: an inlet volume, an outlet volume and a moving reference.
- March 28, 2022 at 2:04 pm
  
  Rob
  Ansys Employee
  
  The solver doesn't look overly happy in the residual plot, but that could be as simple as a mismatch between the mass flow boundary and rotation speed. Double check you've set the correct zone to rotate. Did you set all of the walls in the fan region as rotating?
- March 28, 2022 at 3:26 pm
  
  rm8
  Subscriber
  
  I checked: only the moving reference is rotating. Also the fan walls are rotating (I set 0 rpm relative to the reference frame), except for the engine walls. I can see from a velocity contour on the fan walls that it is correctly rotating
- March 29, 2022 at 10:55 am
  
  Rob
  Ansys Employee
  
  How does the flow look at around 1100 iterations?

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