Effective particle size governs structure and dynamics in rough hard-particle fluids
Abstract
We numerically investigate how particle surface roughness affects the static and dynamic properties of a hard-particle fluid across a wide range of densities, rho. These simulations of a simple model of granular systems reveal that, although the amplitude and coverage of surface corrugation significantly influence the rho-dependence of system properties, the qualitative behavior of this dependence remains unchanged. These findings can be described quantitatively by introducing an effective particle size, which enables a direct mapping of the rough particle systems to equivalent hard-disk systems. Analytical calculations provide an explicit form of this mapping, and allow us to predict the static and dynamic properties of rough particles using standard liquid-state theories for hard disks.
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BibTeX
@misc{xiao2026effective,
title = {{Effective particle size governs structure and dynamics in rough hard-particle fluids}},
author = {Nanqing Xiao and Zhen Zhang and Walter Kob and Yujie Wang},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.08699},
eprint = {2609.08699},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.08699},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Effective particle size governs structure and dynamics in rough hard-particle fluids
AU - Nanqing Xiao
AU - Zhen Zhang
AU - Walter Kob
AU - Yujie Wang
PY - 2026
DA - 2026/09/08
PB - arXiv
DO - 10.48550/arxiv.2609.08699
UR - https://arxiv.org/abs/2609.08699
AB - We numerically investigate how particle surface roughness affects the static and dynamic properties of a hard-particle fluid across a wide range of densities, rho. These simulations of a simple model of granular systems reveal that, although the amplitude and coverage of surface corrugation significantly influence the rho-dependence of system properties, the qualitative behavior of this dependence remains unchanged. These findings can be described quantitatively by introducing an effective particle size, which enables a direct mapping of the rough particle systems to equivalent hard-disk systems. Analytical calculations provide an explicit form of this mapping, and allow us to predict the static and dynamic properties of rough particles using standard liquid-state theories for hard disks.
ER -