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In this letter, we used a combination of DEM and the multi-sphere method toinvestigate the random packing dynamics of $\Sigma_{2v}(2\pi/3)$-triplets.These triplets consist of three overlapping primary spheres, forming a bentstructure with a bond angle of $2\pi/3$ and belonging to the $C_{2v}$ symmetrygroup. The selection of this specific structure was motivated by its similarityto molecules such as water, which displays crucial physicochemical propertiesand finds extensive application in various fields. To ensure non-overlappingparticles at the beginning of the simulations, the rectangular confinement boxwas divided into basic cells. Each triplet was then inserted into a basic cellwith a random orientation. After that, the system is allowed to settle undergravity towards the bottom of the box. An implicit leapfrog algorithm withquaternion acceleration was used to numerically integrate the rotational motionequations. By assuming a molecular approach, we account for the long-rangecohesive forces using a Lennard-Jones (LJ)-like potential. The packingprocesses are studied assuming different long-range interaction strengths. Weperformed statistical calculations of the different quantities studiedincluding packing density, radial distribution function, and orientation paircorrelation function. In addition, the force probability distributions in therandom packing structures have been analyzed.

Random packing dynamics of $\Sigma_{2v}(2\pi/3)$-triplets