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PreprintarXiv licencearXiv

Granular Rods Fall Faster in Denser Obstacle Fields

  • Fumiaki Nakai
  • Hiroaki Katsuragi
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Abstract

How does particle shape affect driven transport through obstacle fields? We simulate a dissipative rod falling under gravity through randomly placed fixed obstacles. For sufficiently slender rods, the mean descent speed before trapping decreases, increases, and then decreases again as obstacle density rises, opening a window of densities in which rods fall faster in denser fields. Scaling arguments based on collision rates and rod geometry explain the three regimes and their crossovers. Particle shape can thus reverse the expectation that crowding slows driven transport.

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Cite

BibTeXRIS
BibTeX
@misc{nakai2026granular,
  title = {{Granular Rods Fall Faster in Denser Obstacle Fields}},
  author = {Fumiaki Nakai and Hiroaki Katsuragi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2609.03473},
  eprint = {2609.03473},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.03473},
}
RIS
TY  - UNPB
TI  - Granular Rods Fall Faster in Denser Obstacle Fields
AU  - Fumiaki Nakai
AU  - Hiroaki Katsuragi
PY  - 2026
DA  - 2026/10/07
PB  - arXiv
DO  - 10.48550/arxiv.2609.03473
UR  - https://arxiv.org/abs/2609.03473
AB  - How does particle shape affect driven transport through obstacle fields? We simulate a dissipative rod falling under gravity through randomly placed fixed obstacles. For sufficiently slender rods, the mean descent speed before trapping decreases, increases, and then decreases again as obstacle density rises, opening a window of densities in which rods fall faster in denser fields. Scaling arguments based on collision rates and rod geometry explain the three regimes and their crossovers. Particle shape can thus reverse the expectation that crowding slows driven transport.
ER  -