Dense granular flows with MFIX-Exa
USDOE Office of Fossil Energy and Carbon Management (FECM), William D. Fullmer, National Energy Technology Lab. (NETL), Morgantown, WV (United States), Deepak Rangarajan, Jordan M. H. Musser · 2025
This report extends the linear spring dashpot collision model the discrete element method available in MFIX-Exa to include static a static tangential friction force. Additionally, two rolling friction models frequently used in the literature are also implemented. The governing equations are provided with an emphasis on the new terms. The new model is validated by comparison to existing experimental data of single particle oblique collisions. The model is then tested on three dense granular flow problems: the formation of static piles, the discharge from a flat-bottom hopper and the self-induced granular Rayleigh-Taylor instability.