Numerical investigation of particle dynamic behaviours in geophysical flows considering solid-fluid interaction

Solid-fluid interaction vitally influences the flow dynamics of particles in a geophysical flow. A coupled computational fluid and discrete element method (CFD-DEM) is used this study to model multiphase as mixture solid phases. The two non-Newtonian fluids (i.e., Bingham Hershcel-Bulkley fluids) water mixed with are considered simulation, while dry granular same volume simulated control test. Results revealed that solid-fluid heavily governs particle dynamic behaviours. Specifically, compared case, three cases characterized by larger mobility greater shear rate smaller basal normal force. In addition, power-law distribution crossover generalized Pareto Distribution recommended fit normalized interparticle contact