On the erosion of cohesive granular soils by a submerged jet: a numerical approach

This paper presents an erosion interpretation of cohesive granular materials stressed by impinging jet based on the results a micromechanical simulation model. The numerical techniques are briefly described, relying two-dimensional Lattice Boltzmann Method coupled with Discrete Element Methods including simple model solid intergranular cohesion. These then used to perform parametric study planar in laminar regime surface samples different degrees strength. show pertinence using generalized form Shields criterion for quantification threshold, which is valid cohesionless samples, through empirical calibration, and also ones. Furthermore, scouring kinetics analysed here from perspective self-similar expansion eroded crater leading identification characteristic time classical coefficient. However, presented challenge postulate local law erodibility parameters as intrinsic material properties. reviews main limitations current models, discusses potential causes observed discrepancies, questioning time-averaged macroscopic relations correctly describe soil erosion. concludes addressing this question complementary simulations re-assessed at particle-scale. resulting critical shear stress single grains reveals very wide dispersion data but nevertheless appears confirm general trend derived while introduction cohesion implies significant systematic quantitative deviation between microscopic estimates. Nevertheless, micro still shows consistently that does actually vary approximately linear proportion adhesive force.