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Article Dans Une Revue Soft Matter Année : 2013

A molecular dynamics study of non-local effects in the flow of soft jammed particles

Résumé

In this paper, we used numerical simulations to investigate the flow properties of soft glassy materials. These systems display a mixed fluid–solid behavior whose theoretical description remains a challenging task. The molecular dynamic simulations exhibit non-local rheological behavior, in direct line with previous experimental results. The inverse viscosity of the material at a given point, denoted as fluidity, is not a local function of the local stress, but also depends on the state of the system in the neighborhood, with a spatial correlation length typically equal to a few particles. The fluidity is furthermore related directly to the velocity fluctuations and rate of plastic events in the form of a scaling function. Correlations are the signature of a cooperative process at the origin of the flow and of the non-local effects. We compare the obtained results with a scalar fluidity model and emphasize the similarities between the two approaches.
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Dates et versions

hal-03030485 , version 1 (30-11-2020)

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Vincent Mansard, Annie Colin, Pinaki Chaudhuri, Lydéric Bocquet. A molecular dynamics study of non-local effects in the flow of soft jammed particles. Soft Matter, 2013, 9 (31), pp.7489. ⟨10.1039/C3SM50847A⟩. ⟨hal-03030485⟩
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