Mesoscopic particulate system assembled from three-dimensional irregular particles.

[Display omitted] • Irregular polyhedron model with controllable shape and size characteristics. • Vector-growth algorithm for controlling convexity and concavity of particle. • An iterative growth algorithm for generating particles with different surface numbers. • Quantitative parametric analysis on shape and size configurations of irregular particles. • Random distribution algorithm for the irregular particles in spatial domain. • Compaction algorithm for controlling volume fraction of particulate system. Particles around us are generally in the form of irregular characteristics in shape and size. Establishing rational mesoscale models that are suitable for different types of particles is of great significance to comprehensively evaluate the mechanical properties of particulate systems assembled from irregular particles. The preponderances of previous works are mainly focused on particle simulations using regular-shaped geometries or simple polyhedrons, and little is known about quantitative characterization for the particles with complex shape characteristics. In this paper, a series of novel and efficient algorithms are presented to generate three-dimensional particulate systems assembled from particles with irregular characteristics in shape and size. According to the developed particle generation algorithm and vector-growth algorithm, the convex- and concave particles with different shape- and size configurations are obtained. Parametric analysis of corresponding algorithm parameters on the shape- and size configurations of particles are quantitatively investigated in terms of different indexes, such as sphericity, angularity and size, which provides an important guidance for the shape- and size control of irregular particles. Based on the generated irregular particles, a series of algorithms are proposed to generate the particulate systems with random spatial characteristics as well. Employing the developed compaction algorithm, mesoscopic particulate systems with different particle gradations and compactness are generated precisely. To sum up, the present particle model provides insights into capturing and studying the meso -structure characteristics and macroscopic mechanical properties of particulate systems. [ABSTRACT FROM AUTHOR]