A clustered overlapping sphere algorithm to represent real particles in discrete element modelling

By X. García, J. Latham, J. Xiang, J. Harrison. 2009

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Particle-based simulation of powder application in additive manufacturing (2016, methodology): “The complex geometric shape of powder particles is modeled here by means of the multisphere method, which consists of combining spherical particles of different sizes to approximate the non-spherical shape [13], [35], [28], [14], [12], [32].”
All you need is shape: Predicting shear banding in sand with LS-DEM (2018, background): “DEM’s lack of ability to capture particle shape has spurred the development of variants able to capture particle shape, ranging from sphere clumping [20] to polyhedra [22] to ellipsoids [46, 59] to NURBS [35].”
Particle dynamics modeling methods for colloid suspensions (2014, background): “A more generic and accurate representation can be accomplished with collections of spheres (overlapping or non-overlapping) [81,178], which are then constrained to move as rigid bodies, as in Fig.”