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Rob
Forum Moderator

If you do a hand calculation what volume fraction of particles are you injecting? DDPM links into the Eulerian Multiphase model, hence my comments: in many cases you're better off with DPM or Eulerian or Rocky. Ansys Rocky is a DEM solver, and can be coupled to Fluent to extend the multiphase capabilities. https://www.ansys.com/en-gb/products/fluids/ansys-rocky covers the basics. 

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