# gst: permeability of deforming soft particle packs.

<< ️The permeability of the fluid between packs of particles is an important parameter for a range of natural and industrial applications. Here, (AA) start from experiments in which soft spherical particles—“soft balls”—are compressed uniaxially, resulting in particle-particle flattening and an overall decrease in interstitial volume fraction 𝜙 down to very low values. >>

<< ️During deformation, the soft particle packs were scanned in three dimensions using x-ray tomography; (AA) segment these data to isolate the fraction between the particles. (They) then run lattice Boltzmann fluid flow simulations through the domains to determine the permeability. >>

<< ️Additionally, (AA) determine the specific surface area 𝑠 and 𝜙. Together, (They) use these parameters to test and validate a semiempirical extension to a theoretical percolation model, to propose a framework for predicting permeability in deforming soft particle systems. >>

<< ️Once validated, (AA) compare this model to the permeability of the fluid in packs of hard particles and during particle sintering; (They) conclude that this model is applicable to a wide range of initially particulate systems with all the geometric information encoded in 𝑠. >>

Jérémie Vasseur, Fabian B. Wadsworth, Jingwei Zhang, et al. Permeability of deforming soft particle packs. Phys. Rev. E 114, 035424. Sep 18, 2026.

https://journals.aps.org/pre/abstract/10.1103/zpm1-lp4n

Also: particle, in https://www.inkgmr.net/kwrds.html 

Keywords: gst, particles, percolation, permeability, flows in porous media, granular compaction, laminar flows, mechanical deformation, granular materials.