Dense shearing flows of soft, frictional cylinders

Berzi, Diego; Buettner, Kevin E.; Curtis, Jennifer

doi:10.1039/d1sm01395e

Soft Matter

2022

DOI: 10.1039/d1sm01395e

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Dense shearing flows of soft, frictional cylinders

Diego Berzi

Kevin E. Buettner

Jennifer Curtis

Abstract: We perform discrete numerical simulations at a constant volume of dense, steady, homogeneous flows of true cylinders interacting via Hertzian contacts, with and without friction, in the absence of preferential alignment.

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Cited by 3 publications

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Particle fluctuations and their effects on the rheological behavior of sheared granular flows

2023

Physics of Fluids

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We present numerical simulations of plane-sheared granular flows in two pressure-controlled configurations and investigate the particle fluctuations over a wide range of the inertial number I. Quantities affecting the velocity fluctuations, including the granular temperature and the stress ratio, are shown to be intrinsically related and to exhibit similar I-dependent characteristics. We first propose a scaling law describing the one-to-one relationship between the granular temperature and I in both the inertial and collisional regimes, where the volume fraction plays an important role. This relation differs from the power-law dependence between the stress ratio and I. However, for low values of I, these two velocity fluctuation quantities deviate from the one-to-one relation, similar to the effective friction coefficient μ. Based on the obtained inverse power law, we propose a new unified model incorporating the stress ratio to describe the rheological behaviors in the quasistatic, inertial, and collisional regimes. The proposed model is more applicable than the one that integrates the granular temperature, allowing nonlocal effects to be roughly eliminated at low values of I and the rheological dependence on the volume fraction to be effectively removed at high values of I. This provides an alternative approach for developing rheological models for granular materials under complex flow conditions.

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Particle fluctuations and their effects on the rheological behavior of sheared granular flows

2023

Physics of Fluids

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On granular flows: From kinetic theory to inertial rheology and nonlocal constitutive models

Berzi

2024

Phys. Rev. Fluids

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Simple generalization of kinetic theory for granular flows of nonspherical, oriented particles

Vescovi,

Nadler,

Berzi

2024

Phys. Rev. Fluids

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Dense shearing flows of soft, frictional cylinders

Abstract: We perform discrete numerical simulations at a constant volume of dense, steady, homogeneous flows of true cylinders interacting via Hertzian contacts, with and without friction, in the absence of preferential alignment.

Cited by 3 publications

References 46 publications

Particle fluctuations and their effects on the rheological behavior of sheared granular flows

Particle fluctuations and their effects on the rheological behavior of sheared granular flows

On granular flows: From kinetic theory to inertial rheology and nonlocal constitutive models

Simple generalization of kinetic theory for granular flows of nonspherical, oriented particles

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