We have performed a systematic, large-scale simulation study of granular media in two and three dimensions, investigating the rheology of cohesionless granular particles in inclined plane geometries, i.e., chute flows. We find that over a wide range of parameter space of interaction coefficients and inclination angles, a steady-state flow regime exists in which the energy input from gravity bal...

We study the rheological properties of a granular suspension subject to constant shear stress by constant volume molecular dynamics simulations. We derive the system "flow diagram" in the volume fraction or stress plane (phi, F): at low phi the flow is disordered, with the viscosity obeying a Bagnold-like scaling only at small F and diverging as the jamming point is approached; if the shear str...

El presente artículo de investigación da a conocer la validación las ecuaciones empíricas transporte sedimentos por arrastre y suspensión empleando para ello mediciones campo en el rìo Chancay – Lambayeque entre los puentes Pucalá Monsefú Éten. La problemática analizada este trabajo es que al haber un aumento progresivo ríos con material fondo fino, estos tienden reducir capacidad hidráulica se...

Debris flows can be considered as mixtures of coarse particles dispersed in a viscous matrix, composed of fine sediment and water. Experiments in a rotating drum with a diameter of 2.5m have been carried out to study the flow behaviour of different material mixtures, ranging from granular avalanches to viscous fluids and grain – fluid mixtures of varying sediment concentration and matrix viscos...

Extending recent modeling efforts for emulsions, we propose a nonlocal fluidity relation for flowing granular materials, capturing several known finite-size effects observed in steady flow. We express the local Bagnold-type granular flow law in terms of a fluidity ratio and then extend it with a particular Laplacian term that is scaled by the grain size. The resulting model is calibrated agains...

A physically based quadratic rheological model for hyperconcentrated flows is tested with experimental data sets. The model includes components describing: (1) Cohesion between particles; (2) viscous friction between fluid and sediment particles; (3) impact of particles; and (4) turbulence. The resulting quadratic formulation of the shear stress is shown to be in excellent agreement with the ex...