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Query Regarding Fluent-Rocky Coupling – Fixed Bed (Ergun Correlation) Issue

- March 9, 2026 at 7:15 am
  
  zhouhaoran18
  Subscriber
  
  Hi all,
  I am currently learning Fluent-Rocky coupled simulation, and I have encountered some issues for which I hope to seek advice.
  I am trying to reproduce the Fixed Bed (Ergun Correlation) case from the Rocky Verification Manual. I have configured Fluent and Rocky strictly following the settings in the Manual. However, the particles in my model do not remain stationary as described in the Manual; instead, they gradually move upward toward the domain edges. I wonder whether this case requires imposing some constraint to fix the particles in the center of the model, or whether no constraints are applied, allowing the particles to maintain equilibrium under the combined effects of gravity and inlet flow velocity, thereby achieving positional stability.
  Any guidance would be highly appreciated. Thanks in advance!
  t=0s t=0.5st=1.0s in Manual:

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