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Surface reconstruction with spherical harmonics and its application for single particle crushing simulations

Journal of Rock Mechanics and Geotechnical Engineering 2022年第1期14卷 232-239页

作者： Deheng Wei budi zhao Yixiang Gan School of Civil Engineering The University of SydneySydneyNSW2006Australia School of Civil Engineering University College DublinDublinIreland

Particle morphology has great influence on mechanical behaviour and hydro/thermal/electrical conductivities of granular *** reconstruction and mesh generation are critical to consider realistic particle shapes in various computational *** study adopts the combined finitediscrete element method(FDEM)to investigate single particle crushing *** shapes were reconstructed with spherical harmonic(SH)in both spherical and Cartesian coordinate ***,the reconstructed surface mesh qualities in two coordinate systems are investigated and *** the efficiency of the two SH systems in reconstructing star-like shapes is nearly identical,SH in Cartesian coordinate system can reconstruct non-star-like shapes with the help of surface ***,a higher triangular mesh quality is generated with spherical *** single particle crushing tests,the low mesh quality produces more fluctuations on load-displacement *** particles with more surficial mesh elements tend to have a lower contact stiffness due to more contact stress concentrations induced by complexity of morphology features and more volumetric tetrahedral *** fracture patterns are also influenced by mesh quality and density,e.g.a particle with fewer mesh elements has a simpler fragmentation *** study serves as an essential step towards modelling particle breakage using FDEM with surface mesh directly from SH reconstruction.

关键词： Numerical modelling Particle morphology Particle crushing/crushability Particle-scale behaviour Sands

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