White papers on built-in MFIX cohesion model?

Hey all,

Are there any resources on the van der Waals cohesion model in MFIX? It seems to be somewhere between a Rumpf model with hemispherical asperities and JKR based on the use of surface energy. I’ve tried rewriting it several ways and can never get it to 100% match the Rumpf models I’ve seen in literature. The current DEM documentation doesn’t seem to talk about the cohesion model.

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Update - the MFIX van der Waals force model is discussed in Janine Gavin and Sofiane Benyahia’s paper “The Effect of Cohesive Forces on the Fluidization of Aeratable Powders”. This is a Rumpf cohesion model.

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