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Metaball based discrete element method for general shaped particles with round features

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Abstract

Discrete element method (DEM) has achieved considerable success on simulating complex granular material behaviours. One of the key challenges of DEM simulations is how to describe particles with realistic geometries. Many shape description methods have been developed including sphere-clustering, polyhedrons, sphero-polyhedrons, superquadric particles to name a few. However, to model general shaped particles with round features , these techniques are either introducing artificial surface roughness or are limited to a few regular shapes. Here we proposed a metaball based DEM where the metaball equation is used to describe particle shapes. Because of its flexibility on choosing control points in the metaball equation, many complex shaped particles can be modelled within this framework. The particle collision is handled by solving an optimization problem. A Newton–Raphson method based algorithm of finding the closest points for metaball DEM is developed accordingly. Using 3D printed particles, the proposed scheme is validated by comparing the simulated ran-out distance with granular column collapses experimental results. The model is further applied to study shape effects on vibration induced segregations. It is shown that the proposed metaball DEM can capture shape influence which may crucial in many engineering and science applications.

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Acknowledgements

We gratefully acknowledge the funding from The Belt and Road Special Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (2019491511). We thank Westlake University Supercomputer Center for computational resource and related assistance. The software used for all the simulations presented in this paper is based on the open source library ComFluSoM (URL: https://github.com/peizhang-cn/ComFluSoM) developed by the first author.

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Authors and Affiliations

  1. Key Laboratory of Coastal Environment and Resources of Zhejiang Province (KLaCER), School of Engineering, Westlake University, Hangzhou, China

    Pei Zhang, Yueshi Dong, S. A. Galindo-Torres & Ling Li

  2. School of Civil Engineering, University of Queensland, Queensland, Australia

    A. Scheuermann

  3. Joint COOP Institute, Chongqing University, Chongqing, China

    Yueshi Dong

Authors
  1. Pei Zhang
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  2. Yueshi Dong
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  3. S. A. Galindo-Torres
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  4. A. Scheuermann
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  5. Ling Li
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Correspondence to S. A. Galindo-Torres.

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Zhang, P., Dong, Y., Galindo-Torres, S.A. et al. Metaball based discrete element method for general shaped particles with round features. Comput Mech 67, 1243–1254 (2021). https://doi.org/10.1007/s00466-021-02001-9

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  • DOI: https://doi.org/10.1007/s00466-021-02001-9

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