Discrete element modeling of strongly deformed particles in dense shear flows

The discrete element method (DEM) proposed by Cundall and Strack [1] is a widely used numerical approach to study the fundamentals of particulate matter at particle scale. In our present study, flow behavior dense configurations soft particles was studied means new formulation multi-contact force closure for DEM. first step verify response closure, calibrate its parameters based on comparison results simple uniaxial compression with from reference simulation. This simulation highly accurate nonlocal contact mechanics in quasi-static limit [2], which accounts interplay deformations due multiple forces acting single particle. newly developed calibrated model show significant improvement over those derived via existing model. Also, dependence stress sheared granular Poisson's ratio unveiled when using advanced closure. Therefore, an extensive campaign shear simulations performed (at fixed volume box) probe effect fraction speed shearing. These that fractions larger than critical value depends not only friction coefficient stiffness, but also material. Finally, we report surface pressure bed as function all key influence parameters. beneficial calibrating DEM extremely configurations.