A numerical toolkit to understand the mechanics of partially saturated granular materials

Jean-Noël Roux (1)

1 Rhéophysique

The mechanisms by which a wetting, non-saturating liquid bestows macroscopic cohesion and strength to a granular material are usually not accessible to micromechanical investigations for saturations exceeding the pendular regime of isolated menisci, easily studied by discrete element models. The " JFM-Rapids " paper (vol. 762, R5, 2015) by Delenne, Richefeu and Radja¨ıRadja¨ı, exploiting a multiphase Lattice Boltzmann approach, pioneers the simulation of the micromorphology and of the mechanical effects on grains of an interstitial liquid, in equilibrium with its vapour, for the whole saturation range. Interestingly , in accordance with some experiments and phenomenological models, the results suggest that the mechanical effect of capillary forces is maximized for some intermediate saturation level (near 40% in the model), well beyond the pendular range. In general, the proposed simulation technique opens the way to many studies of partially saturated granular assemblies, for different saturation or imbibition processes and histories.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Jean-Noël Roux. A numerical toolkit to understand the mechanics of partially saturated granular materials. Journal of Fluid Mechanics, 2015, 770, pp.1-4. ⟨10.1017/jfm.2015.66⟩. ⟨hal-01699268⟩