Micromechanical features of jet erosion - A numerical perspective
Résumé
The erosion mechanisms driving the particle detachment of a soil under an impinging jet are
here analysed from a micromechanical perspective combining the numerical Discrete Element and Lattice
Boltzmann methods (DEM-LBM). Firstly, the local hydrodynamic conditions of both free and impinging jets
are examined and briefly discussed, particularly on the relevance of the superficial irregularities of the granular
assembly, which can dominate the local distribution of hydrodynamic variables over the impingement
area. Profiles of both macromechanic and discrete (micromechanic) variables will be put forward. Then, the
onset of erosion is reviewed from a topological point of view (locality of first grain motion) on the basis of a
parametric study. Finally, the variation of the critical inflow velocity for the initiation of erosion in dependence
on the particle size is also examined and briefly discussed.
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