Deformation Modes for Assemblies of Frictionless Polydisperse Spheres

Kumar, Nishant; Imole, Olukayode Isaiah; Magnanimo, Vanessa; Luding, Stefan

doi:10.4028/www.scientific.net/amr.508.160

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…For instance, interparticle friction can help stabilize force chains, which would support shear jamming. But, recent simulations indicate that shear jamming can occur for frictionless particles [19,20]. The details of local processes, and the connection between force/contact networks and particle kinematics are still an open question.…”

Section: Discussionmentioning

confidence: 99%

Jamming and shear for granular materials

Behringer¹,

Dijksman²,

Ren³

et al. 2013

AIP Conference Proceedings

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Abstract. This paper describes a series of experiments which have explored systems of frictional disks that have been prepared near jamming and then subjected to shear strain. A key observation is that below a density (described by packing fraction, φ ) of about φ J 0.84, it is possible to prepare stress-free states, and then by applying shear, traverse states that are fragile (highly anisotropic), shear jammed, and then increasingly isotropic. The anisotropy of these states is a dominante feature in the shear jamming process, which differs from the Liu-Nagel scenario. The evolution of these states suggests that an activated process in the context of a force (or stress) ensemble characterizes the stress evolution during cyclic strain.

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Section: Discussionmentioning

confidence: 99%

Jamming and shear for granular materials

Behringer¹,

Dijksman²,

Ren³

et al. 2013

AIP Conference Proceedings

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“…37 Thus, to generate random configurations at f 4 0.45, an event driven method, combined with a particle swelling procedure, is applied. 38 This ensures the particles are randomly distributed. The same approach was followed by Tang et al, for Newtonian fluid simulations for a range of low to intermediate Reynolds numbers.…”

Section: Problem Descriptionmentioning

confidence: 99%

Viscoelastic flow past mono- and bidisperse random arrays of cylinders: flow resistance, topology and normal stress distribution

Kuipers

Peters

et al. 2017

Soft Matter

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We investigate creeping viscoelastic fluid flow through two-dimensional porous media consisting of random arrangements of monodisperse and bidisperse cylinders, using our finite volume-immersed boundary method introduced in S. De, et al., J. Non-Newtonian Fluid Mech., 2016, 232, 67-76. The viscoelastic fluid is modeled with a FENE-P model. The simulations show an increased flow resistance with increase in flow rate, even though the bulk response of the fluid to shear flow is shear thinning. We show that if the square root of the permeability is chosen as the characteristic length scale in the determination of the dimensionless Deborah number (De), then all flow resistance curves collapse to a single master curve, irrespective of the pore geometry. Our study reveals how viscoelastic stresses and flow topologies (rotation, shear and extension) are distributed through the porous media, and how they evolve with increasing De. We correlate the local viscoelastic first normal stress differences with the local flow topology and show that the largest normal stress differences are located in shear flow dominated regions and not in extensional flow dominated regions at higher viscoelasticity. The study shows that normal stress differences in shear flow regions may play a crucial role in the increase of flow resistance for viscoelastic flow through such porous media.

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“…Unfortunately, such a standard MC method is not suited to provide sufficient randomization for highly dense packings . Therefore, the random configurations at

ϕ > 0.45

are created in this work using an event‐driven method combined with particle swelling procedure, which drastically improves the randomness as being seen from the radial pair distribution function that we have examined.…”

Section: Ibm Simulations Of Flow Past Static Arraysmentioning

confidence: 99%

A new drag correlation from fully resolved simulations of flow past monodisperse static arrays of spheres

et al. 2014

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Fully resolved simulations of flow past fixed assemblies of monodisperse spheres in face‐centered‐cubic array or random configurations, are performed using an iterative immersed boundary method. A methodology has been applied such that the computed gas–solid force is almost independent of the grid resolution. Simulations extend the previously similar studies to a wider range of solids volume fraction ( ϕ∈[0.1, 0.6]) and Reynolds number (Re ∈ [50, 1000]). A new drag correlation combining the existed drag correlations for low‐Re flows and single‐sphere flows is proposed, which fits the entire dataset with an average relative deviation of 4%. This correlation is so far the best possible expression for the drag force in monodisperse static arrays of spheres, and is the most accurate basis to introduce the particle mobility for dynamic gas–solid systems, such as in fluidized beds. © 2014 American Institute of Chemical Engineers AIChE J, 61: 688–698, 2015

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Deformation Modes for Assemblies of Frictionless Polydisperse Spheres

Cited by 11 publications

References 8 publications

Jamming and shear for granular materials

Jamming and shear for granular materials

Viscoelastic flow past mono- and bidisperse random arrays of cylinders: flow resistance, topology and normal stress distribution

A new drag correlation from fully resolved simulations of flow past monodisperse static arrays of spheres

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