Bug report of GSP solver to simulate cylindrical particle fluidization

MFiX
#1

Hello, I used the GSP solver to simulate cylindrical particle fluidization and found some problems (maybe a bug).
The simulation case is copied from this folder: mix-24.2.3/tutorials/gsp/fb_gsp.
I only changed the drag model (Gidaspow) and the inlet gas velocity in the Y direction (2 m/s, 4 m/s, and 6 m/s). The problem is that the cylinders cannot be fluidized at the inlet velocity of 2 m/s.

Actually, the domain and particle properties used in this case are almost the wood cylinders, like the following references, and the minimum fluidization velocity of these cylinders is less than 1 m/s. So, cylinders should be completely fluidized at 2 m/s.

References:
http://dx.doi.org/10.1016/j.powtec.2015.11.045
https://doi.org/10.1002/aic.17211.

GSP_FB_Ug_Test
GSP_FB_Ug_Test1920×1441 190 KB

fb_gsp_Ug_Cases.zip (125.1 KB)

#2

Apologies for the late response, we’ve been busy with the new version release. Although you probably already know this, in the tutorial case, the particle mass is larger than that in the references, and the number of particles can also affect fluidization. Additionally, the velocity mentioned in the literature is superficial velocity, which might differ from the inlet boundary conditions in the tutorial example.