Assessment of rolling resistance models in discrete element simulations

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Discrete element simulation and experimental study of powder spreading process in additive manufacturing (2017, methodology): “The adopted model constantly applies a resistive torque to the spheres in contact with the bottom wall, which is given by [21, 22, 23]”
A Methodical Calibration Procedure for Discrete Element Models (2017, background): “Additional 12 parameters which lack a physical basis are usually needed when grain crushing [9] or rolling resistance [10] 13 are considered in the model.”
A new contact model to improve the simulated ratio of unconfined compressive strength to tensile strength in bonded particle models (2014, background): “The rotational resistance is often referred to as rolling resistance or rolling friction [42].”
A novel three-dimensional contact model for granulates incorporating rolling and twisting resistances (2015, background): “In [47], previously developed rolling resistance models in the literature were compared and it was found that the elastic–plastic spring-dashpot type models were generally the most effective, although others could be appropriate in specific instances.”
A Study of Three Intrinsic Problems of the Classic Discrete Element Method Using Flat-Joint Model (2016, background): “Rotational resistance is often referred to as rolling resistance or rolling friction (Ai et al. 2011).”