Generally speaking, there exist various types of solid particles in the industrial fields such as: in terms of particle-scale, from Nano-sized particles which cause a defect in the semiconductor process, virus, micron-particles which are used in the printer-toner, chemical by-products, ultra-fine powder in the grinding process, sand, gravel, grains, and mineral ores. Discrete element method (DEM), also called as distinct element method, is a kind of analytical method which recognizes interactions between various types of solid particles; predicts the motion of large number of small particles or efficiency of the combination of more than two types of particles; or pre-measures the external forces on structures applied by particles. In other words, it is a Lagrangian method which determines the movement by using the six degrees of freedom motion equations and considers all forces of individual particles; and it uses to receive the time integration with explicit method. Therefore, DEM requires a lot of memory and computing power for its very small time step and large number of particles to be considered generally. Samadii/dem, which is designed to perform analysis based on the GPU and parallel processing techniques, provides highly reliable analysis results by analyzing a variety of large-scale grain boundary issues at a high speed.

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