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PreprintarXiv licencearXiv

Sliding contact fraction in gravity-driven dense cohesionless granular flows

  • Patrick Richard
  • Riccardo Artoni
  • Clovis Lambert
  • Rapha{ë}l Maurin
  • Pascal Fede
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Abstract

Using large-scale, three-dimensional discrete element simulations, we investigate the kinematic properties of granular chute flows of cohesionless grains, together with the evolution of the coordination number and the fraction of sliding contacts. Our results reveal that, under certain conditions, increasing the grain--grain friction coefficient leads to a decrease in the global dissipation of the system. This finding highlights that the overall dissipation is not solely governed by the energy lost during sliding contacts, but also by the probability that such contacts occur, a probability that decreases markedly as the friction coefficient increases. Together, these effects demonstrate the subtle and nontrivial interplay between grain-scale frictional interactions and macroscopic flow behavior in dense and cohesionless granular materials.

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Cite

BibTeXRIS
BibTeX
@misc{richard2026sliding,
  title = {{Sliding contact fraction in gravity-driven dense cohesionless granular flows}},
  author = {Patrick Richard and Riccardo Artoni and Clovis Lambert and Raphaël Maurin and Pascal Fede},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.15546},
  eprint = {2609.15546},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.15546},
}
RIS
TY  - UNPB
TI  - Sliding contact fraction in gravity-driven dense cohesionless granular flows
AU  - Patrick Richard
AU  - Riccardo Artoni
AU  - Clovis Lambert
AU  - Rapha{ë}l Maurin
AU  - Pascal Fede
PY  - 2026
DA  - 2026/09/14
PB  - arXiv
DO  - 10.48550/arxiv.2609.15546
UR  - https://arxiv.org/abs/2609.15546
AB  - Using large-scale, three-dimensional discrete element simulations, we investigate the kinematic properties of granular chute flows of cohesionless grains, together with the evolution of the coordination number and the fraction of sliding contacts. Our results reveal that, under certain conditions, increasing the grain--grain friction coefficient leads to a decrease in the global dissipation of the system. This finding highlights that the overall dissipation is not solely governed by the energy lost during sliding contacts, but also by the probability that such contacts occur, a probability that decreases markedly as the friction coefficient increases. Together, these effects demonstrate the subtle and nontrivial interplay between grain-scale frictional interactions and macroscopic flow behavior in dense and cohesionless granular materials.
ER  -