[gregd]

Hello all,

I am having difficulty achieving realistic solids settling. I am trying to simulate water carrying sandstone granules (1/4 inch diameter) in the annulus between to pipes (OD's of 8 in and 4.5 in). According to experimental data, at the flow rate I am using (200 gpm), approximately 210 lbs of sandstone should be in a 25 ft section at stead state. I am getting about 5 lbs in Fluent.

I am using Fluent 14.5, and I am using the Euler multiphase model with a granular second phase. Also, I am using the Reynolds Stress dispersed viscosity model. I have seen papers describing issues with drag coefficients, so I am using the Gidaspow drag model with the Brucato drag factor modification. I have also tried several turbulent dispersion models with no luck.

Does any one have any advice to help me achieve a more realistic simulation?

Thank you in advance.