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Why do particle jump during CFD-DEM simulation?

User: "Fatemeh Hosseini_22198"
Fatemeh Hosseini_22198
Altair Community Member
Updated by Fatemeh Hosseini_22198

Hello, everybody,

I noticed particles jumping from the bottom of the tube during the CFD-DEM simulation (in a horizontal tube with gravity in the Z direction).
Since I have gravity in my system, they should move on the lower part of the tube. (Please refer to the attached)
I ran this simulation in a larger tube, and I didn't observe any strange behavior. Do you believe dp/D may be causing the problem? (D is the tube diameter, and dp is the particle diameter).
Currently, the D/dp is 200, whereas it was 1000 in the previous instance.
Or do you think the P-W surface energy is the cause of it? 


I appreciate your assistance in advance.

Regards,
Fatemeh


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