Mixing and separation of rotating drums

Hi Xutong - that’s a nice image.

I don’t believe that MFiX has any built-in computation of “mixing index”.
A Google search for “mfix” and “mixing index” turns up a few interesting papers where people have implented the (Lacey) mixing index within the DEM framework.

https://pubs.acs.org/doi/10.1021/acs.iecr.1c03015?fig=fig6&ref=pdf

https://www.tsijournals.com/articles/numerical-simulation-of-lithiumtitanium-gassolid-fluidized-beds-with-mfix-and-assessing-the-effects-of-pressure-particle.pdf

There are also some other MFiX users on the forum studying mixing index:

Hope this helps,

– Charles