Numerical insight into the micromechanics of jet erosion of a cohesive granular material
1 IRSTEA, UR RECOVER, 3275 route de Cézanne, 13182 Aix-en-Provence Cedex 5, France
2 BAM, Division 7.2 Buildings and Structures, Unter den Eichen 87, 12205 Berlin, Germany
3 UMR IATE, INRA – CIRAD - Montpellier Supagro, 2 place Pierre Viala, 34060 Montpellier, France
4 LMGC, CNRS - Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier, France
5 MSE2, UMI 3466 CNRS-MIT, CEE, MIT, 77 Massachusetts Avenue, Cambridge CA 02139, USA
* Corresponding author: email@example.com
Published online: 30 June 2017
Here we investigate the physical mechanisms behind the surface erosion of a cohesive granular soil induced by an impinging jet by means of numerical simulations coupling fluid and grains at the microscale. The 2D numerical model combines the Discrete Element and Lattice Boltzmann methods (DEM-LBM) and accounts for the granular cohesion with a contact model featuring a paraboloidal yield surface. Here we review first the hydrodynamical conditions imposed by the fluid jet on a solid granular packing, turning then the attention to the impact of cohesion on the erosion kinetics. Finally, the use of an additional subcritical debonding damage model based on the work of Silvani and co-workers provides a novel insight into the internal solicitation of the cohesive granular sample by the impinging jet.
© The Authors, published by EDP Sciences, 2017
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