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Article Dans Une Revue EPJ Web of Conferences Année : 2017

Dense flow around a sphere moving into a cloud of grains

Résumé

A bidimensional simulation of a sphere moving at constant velocity into a cloud of smaller spherical grains without gravity is presented with a non-smooth contact dynamics method. A dense granular “cluster” zone of about constant solid fraction builds progressively around the moving sphere until a stationary regime appears with a constant upstream cluster size that increases with the initial solid fraction φ_0 of the cloud. A detailed analysis of the local strain rate and local stress fields inside the cluster reveals that, despite different spatial variations of strain and stresses, the local friction coefficient μ appears to depend only on the local inertial number I as well as the local solid fraction φ, which means that a local rheology does exist in the present non parallel flow. The key point is that the spatial variations of I inside the cluster does not depend on the sphere velocity and explore only a small range between about 10^−2 and 10−1. The influence of sidewalls is then investigated on the flow and the forces.
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Dates et versions

hal-04415279 , version 1 (15-03-2024)

Identifiants

Citer

Philippe Gondret, Sylvain Faure, Aline Lefebvre-Lepot, Antoine Seguin. Dense flow around a sphere moving into a cloud of grains. EPJ Web of Conferences, 2017, Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Medi, 140, pp.03013. ⟨10.1051/epjconf/201714003013⟩. ⟨hal-04415279⟩
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