I am working with mixing of printing polymer and solid syntactic foam balloon particles in order to yield a uniform mixing of balloons within the polymer. I'm using fluent DDPM-KTGF model. But, on injecting particles the solid particle concentration near the inlet is very very high. Upon careful observation I noticed that multiple parcels were actually overlapping each other near the inlet that is why the volume fraction and the concentration was very high.
Therefore, I am searching for a solution to counter the over lapping of particles that causes divergence, reverse flows etc. Any help would be appreciated.