How to solve this problem？

1time_2023-09-19T181952.105762.zip (68.8 MB)

It looks like you are running with SMP. Does the same problem occur when you run in serial mode?

This problem still occurs when I use dmp

Your mesh not well resolved and not watertight. The Boundary conditions are also not well defined. You have a pressure outlet defined away from the closed stl geometry and the MFiX box is much larger than the tube.

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Hello, thank you for your answer. How can I solve the grid analysis and waterproof problems

Hello, I would like to ask by the way, when I choose dem model, do I still need to use turbulence model and drag model

Hello, after I changed the boundary conditions and the size of the external MFIX box, it works fine, but the following problem occurs when it runs to 0.18s. How should I solve it? Thank you for your answer

1time_2023-09-22T100543.862745.zip (60.6 MB)