Inertial drag in granular media

Athani, Shivakumar; Rognon, Pierre

doi:10.1103/physrevfluids.4.124302

Cited by 17 publications

(6 citation statements)

References 44 publications

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“…2(c) to collapse the force profiles also in the regime immediately following the peak. Athani and Rognon recently also observed similar peaks in a 2d simulated system [32]. As the force peak occurs, the average local packing fraction directly below the rod bottom, φ center , reaches a maximum that is independent of v 0 (Fig.…”

supporting

confidence: 59%

Intrusion into granular media beyond the quasi-static regime

Roth,

Han,

Jaeger

2019

Preprint

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supporting

confidence: 59%

Intrusion into granular media beyond the quasi-static regime

Roth,

Han,

Jaeger

2019

Preprint

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“…One critical issue is to consider the effect of non-homogeneous boundary conditions. While many papers deal with the penetration of an intruder in a packing [23,24,44], to our best knowledge there are very few that deal with its pull-off [27]. Note that these are far to be symmetrical configurations which confirm the difference of behavior with our configuration and show the need for a specific study.…”

Section: Introductionmentioning

confidence: 63%

Forces and flow induced by a moving intruder in a granular packing: coarse-graining and DEM simulations versus experiments

et al. 2020

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The study of stress transmission and particles' mobility in powder beds constitutes a challenging issue to improve processes such as milling, agglomeration and kneading. In this paper the ability to promote particle mobilities by means of an intruder is investigated. An experimental setup was developed to characterize the particles' mobility at the voxel scale. A Particle Image Velocimetry (PIV) algorithm was employed to determine the velocity fields in the vicinity of an intruder in ascendant vertical motion. A Discrete Element Method (DEM) model was developed to simulate the same system at the particle scale. Velocity maps were determined relying on a coarse-graining procedure and compared to PIV results. During the rise of the intruder the experimental and simulated drag forces are in good agreement. Spatiotemporal correlation between the granular mobility and the state of the force network are analyzed as a function of the height of the intruder. The drag force profile exhibits a relaxation trend, noised by fluctuations whose origin are in successive loading/rupture events. An interpretation of these fluctuations is proposed with regard to the development of preferential paths in the normal force network, and to the localization of sliding at the contacts scale. Finally, we show that global strains are a consequence of the ejection of particles directly in contact with the ends of the intruder.

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“…Lastly, we expect these water-induced rate-effects to play an important role in the mobility response of objects subjected to dynamic and cyclic loadings [41,42], and in the development of drag instabilities that have been observed in dry packings [7,22,43].…”

Section: Discussionmentioning

confidence: 99%

Drag force in immersed granular materials

Hossain¹,

Rognon²

2020

Preprint

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We investigate the drag forces acting on large objects moving through a granular packing immersed in water. In this aim, we conducted uplift experiments involving pulling out horizontal plates at a prescribed velocity vertically. During these tests, we observed that the drag force reaches to peak at a low displacement and then decays. Results show that the peak drag force strongly increases with the velocity and depends on the plate size and grain diameter. We identify empirical scaling laws for these properties and introduce a Darcy-flow mechanism that can explain them. Furthermore, we conducted tests involving suddenly stopping the motion of the plate, which evidenced a progressive relaxation of the drag force in time. We discuss how a visco-elasto-plastic mechanical analogue can reproduce these dynamics. These results and analyses highlight fundamental differences in drag force between dry and immersed granular materials.

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Inertial drag in granular media

Cited by 17 publications

References 44 publications

Intrusion into granular media beyond the quasi-static regime

Intrusion into granular media beyond the quasi-static regime

Forces and flow induced by a moving intruder in a granular packing: coarse-graining and DEM simulations versus experiments

Drag force in immersed granular materials

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