Asymmetric velocity correlations in shearing media

Olsson, Peter

doi:10.1103/physreve.82.031303

Cited by 5 publications

(3 citation statements)

References 17 publications

(30 reference statements)

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“…27 However this model is less realistic and leads to anomalous results for the fluctuations and their spatial correlations. 2,3,28 The shear stress s is calculated from the contact forces via the Born-Huang formula: 29…”

Section: Numerical Modelmentioning

confidence: 99%

Fluctuations in flows near jamming

et al. 2015

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Fluctuations in flows near jammingWoldhuis, E.; Chikkadi, V.; van Deen, M.S.; Schall, P.; van Hecke, M. Published in: Soft Matter DOI:10.1039/c5sm01592hLink to publication Citation for published version (APA):Woldhuis, E., Chikkadi, V., van Deen, M. S., Schall, P., & van Hecke, M. (2015). Fluctuations in flows near jamming. Soft Matter, 11(35), 7024-7031. DOI: 10.1039/c5sm01592h General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Bubbles, droplets or particles in flowing complex media such as foams, emulsions or suspensions follow highly complex paths, with the relative motion of the constituents setting the energy dissipation rate.What is their dynamics, and how is this connected to the global rheology? To address these questions, we probe the statistics and spatio-temporal organization of the local particle motion and energy dissipation in a model for sheared disordered materials. We find that the fluctuations in the local dissipation vary from nearly Gaussian and homogeneous at low densities and fast flows, to strongly intermittent for large densities and slow flows. The higher order moments of the relative particle velocities reveal strong evidence for a qualitative difference between two distinct regimes which are nevertheless connected by a smooth crossover. In the critical regime, the higher order moments are related by novel multiscaling relations. In the plastic regime the relations between these moments take on a different form, with higher moments diverging rapidly when the flow rate vanishes. As these velocity differences govern the energy dissipation, we can distinguish two qualitatively different types of flow: an intermediate density, critical regime related to jamming, and a large density, plastic regime.

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Section: Numerical Modelmentioning

confidence: 99%

Fluctuations in flows near jamming

et al. 2015

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“…Thus, detailed studies of the link between statistics and spatial structures are left for future. Similarly, anisotropy induced by shear [93][94][95][96][97][98][99], e.g. shear-bands, should be examined in future.…”

Section: B Future Workmentioning

confidence: 99%

The role of friction in statistics and scaling laws of avalanches

Saitoh

2021

Eur. Phys. J. E

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We investigate statistics and scaling laws of avalanches in two-dimensional frictional particles by numerical simulations. We find that the critical exponent for avalanche size distributions is governed by microscopic friction between the particles in contact, where the exponent is larger and closer to mean-field predictions if the friction coefficient is finite. We reveal that microscopic "slips" between frictional particles induce numerous small avalanches which increase the slope, as well as the power-law exponent, of avalanche size distributions. We also analyze statistics and scaling laws of the avalanche duration and maximum stress drop rates, and examine power spectra of stress drop rates. Our numerical results suggest that the microscopic friction is a key ingredient of mean-field descriptions and plays a crucial role in avalanches observed in real materials.

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“…Olsson [42] reported that the computational calculation to obtain the correlation length and resolve its scaling behavior is an arduous numerical task; he further comments that the two-point correlation associated with non-affine velocity for a system under shear presents zones of correlation and anticorrelation associated with the angular orientation in which the correlation is measured. Therefore to avoid anticorrelation effects in the orientation dynamics, we propose to measure the correlation using the spatial activity field of the non-affine velocity, defined as…”

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confidence: 99%