Hello Rob, thank you for reply

I am choosing the DDPM model, for the following:

- I would like to evaluate the trajectory of the particles

- Because I want to handle higher volume fraction

- The study is about a gas-solid flow in riser, including particle-particle interaction

I am trying to replicate the study of Bolio et al. in Ansys fluent, this study has the following characteristics (steady, fully-developed vertical pipe flow):

I am looking for compare my results with their results:

According to what I mentioned before, I considered modeling in DDPM, if I'm wrong please correct me or please give me some suggestion.

Thank you.