SQP-DEM particle unrealistic behavior during fluidization

I am conducting fluidization of prolate particles in in DEM-SQP model. Particles are generated with automatic generation. In start of simulation each particle pumped out, but with the time, some particle start to settle down while some remain in fluidized state. Video and case file attached for insight.

Need suggestions to overcome this problem.
Thanks.


try.mfx (23.8 KB)

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Can you please try the SQP_DIFELICE_GANSER drag to see if this makes a difference?

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