Published November 15, 2024 | Version v1
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Numerical results from DEM simulations

Authors/Creators

  • 1. ROR icon Japan Agency for Marine-Earth Science and Technology

Description

The DEM code, DEPTH (https://www.jamstec.go.jp/namr/project06.html), was used to simulate the compressive behavior of hierarchical granular piles. The "zenodo_SA24.zip" file contains six folders:

  1. hierarchical_16
    • F_wall_1e4_ave.txt (Fig. 19)
    • fig_P_phi_16.pdf
  2. hierarchical_32
    • contact_angle_32.dat (Fig. 12)
    • coordination_distance_32.dat (Figs. 9 and 10)
    • distance_32_step_xxxx.dat (Fig. 11)
    • energy_velocity_32.dat (Fig. 13(a))
    • F_wall_1e4_ave.txt (Figs. 7 and 17(a))
    • POV_32_stepxxxx_y.dat (Fig. 2)
    • POV_32_stepxxxx_LR.png
  3. hierarchical_64
    • coordination_distance_64.dat (Figs. 9 and 10)
    • distance_64_step_xxxx.dat
    • energy_velocity_64.dat (Fig. 13(b))
    • F_wall_1e4_ave.txt (Figs. 8 and 17(b))
    • POV_64_stepxxxx_y.dat (Fig. S2)
  4. single_16
    • F_wall_1e4_single_casex.txt (Fig. 18)
  5. single_32
    • F_wall_1e4_single_casex.txt (Fig. 16(a))
  6. single_64
    • F_wall_1e4_single_casex.txt (Figs. 15(a) and 16(b))
    • pair_integral_case1.txt (Fig. 15(b))

Abstract

Hierarchical granular piles composed of aggregates are key structural features in both geoscience and planetary science, from fault gouge in seismic zones to the internal structures of comets. Although experimental studies have suggested a multi-step evolution in their packing structure, this hypothesis has lacked numerical validation. In this study, we performed large-scale numerical simulations using the discrete element method to investigate the compressive behavior of hierarchical granular piles. We successfully reproduced and confirmed a three-stage evolution process: (i) rearrangement of the aggregate packing structure, (ii) plastic deformation of small aggregates, and (iii) elastic deformation of constituent particles. Additionally, we developed a semi-analytical model for the compression curve, offering insights into the compressive stages and structural dynamics. Our findings have applications in modeling the internal density profiles of comets and in understanding the early thermal evolution of small icy bodies.

Files

zenodo_SA24.zip

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