Help needed: The asymmetric inlet boundary condition is defined inside the computational domain, causing the simulation to fail

MFiX
1

We are currently simulating a fluidized bed with an asymmetric gas distributor made of sintered metal powder. The left figure shows the engineering drawing, and the right figure shows the geometry file in MFiX. The red area represents the gas inlet. At present, we are debugging a gas-only case, and particles will be added later.

We are able to successfully select the inlet surface. However, it appears that because part of the inlet is located inside the computational box, the simulation cannot run properly.

Below are our geometry file and the corresponding setup files.

Thank you very much for your valuable time and assistance.

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image285×682 75.8 KB

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mfix_file.zip (329.8 KB)

2

Did you check the mesh quality?
A few things you can try:

  1. increase the normal distance tolerance (Mesh>Mesher pane), say to 0.02
  2. Set the Fluid normalization to 0 (Numerics>Residuals pane)
  3. Increase the number of linear solver iterations (200 for pressure, 50 for u,v,w) in Numerics>Linear solver
3

Thank you very much, Jeff. Following your method, the case was successfully executed.