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Particle flows occur in a very wide range of industrial applications. In a Discrete element model (DEM) the motions of the individual particles in the system are tracked. The model simulates all the interactions between the particles and their environment. The goal is to predict the macro‐properties of the flow and the modelling of the separate particles is only as accurate as required for this global aim. It is necessary to simulate particles of many different sizes and densities interacting with complex shaped surfaces.

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