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Subdiffusive behavior in a two-dimensional planar shear granular flow

机译:二维平面剪切颗粒流中的亚扩散行为

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We study the rheology of a compact ensemble of beads in a two-dimensional planar shear configuration by means of molecular dynamics. The rheology obtained shows a plateau for low shear rates. In this parameter region we observe the presence of a collective behavior, sticking agglomerates of particles, characterized by a velocity lower than the mean flow velocity. The lifetime of this blocking regions can stand several thousands time units. Moreover, our analysis of the mean square displacement shows a growth of the form 〈(Δr(τ))~2〉 ~ τ~β with β < 1.0. This indicates the presence of a subdiffusive flow in the quasi-static regime characterized by the presence of vortices. In this work we detail how the observed transient agglomerates of particles deform the flow and we used a local relaxation time analysis for characterizing the inhomogeneities.
机译:我们通过分子动力学研究二维平面剪切构型中的珠子的紧密整体的流变学。获得的流变性显示出低剪切速率的平稳状态。在此参数区域中,我们观察到集体行为的存在,粘附了颗粒的团块,其特征是速度低于平均流速。该阻塞区域的寿命可以达到数千个时间单位。此外,我们对均方位移的分析表明,当β<1.0时,增长形式为<(Δr(τ))〜2>〜τ〜β。这表明在半静态状态下存在以扩散为特征的亚扩散流。在这项工作中,我们详细介绍了观察到的颗粒瞬态团聚体如何使流动变形,并且我们使用了局部弛豫时间分析来表征不均匀性。

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