Blanc, Juliette Khairallah, Diana Ramirez, Diego Chupin, Olivier Pouget, Simon Ta, Quang-Anh Duval, Anthony Hornych, Pierre Benoist, Sophie
Tamping and ballast wear, due to dynamic stresses, lead to frequent and costly maintenance operations. To mitigate the impact, an innovative track structure combining a bituminous (asphalt concrete) layer below the ballast has been built on the Bretagne-Pays de la Loire High-Speed Line (BPL HSL). The track is intended to reduce the amplitude of the...
Artoni, Riccardo Larcher, Michele Jenkins, James Richard, Patrick
We report on measurements of self-diffusion coefficients in discrete numerical simulations of steady, homogeneous, collisional shearing flows of nearly identical, frictional, inelastic spheres. We focus on a range of relatively high solid volume fractions that are important in those terrestrial gravitational shearing flows that are dominated by col...
CONSTANT, Matthieu COPPIN, Nathan DUBOIS, Frédéric ARTONI, Riccardo LAMBRECHTS, Jonathan LEGAT, Vincent
This paper is devoted to the investigation of the density sorting of grains using water jigging. Experiments achieved in a laboratory scale water jig for two initial binary bed configurations are studied and compared to numerical results. The vertical composition of the deposit is estimated after different number of water pulses to represent the so...
WEI, Deheng WANG, Xiaomeng PEREIRA, Jean-Michel GAN, Yixiang
The present work explores water permeability of uniformly graded irregular grains using 3D printing with controlled shapes and fractal morphological features at low Reynold's number for viscous flow. From large amount of real 3D granular morphological data, a scaling law, in terms of fractal dimension, is found to be followed. With this universal l...
Mora, Pierric Chekroun, Mathieu Tournat, Vincent
Seismic metamaterials have been the subject of much recent interest, with notable conceptual advances and the demonstration of possible full-scale effectiveness in earthquake protection. Here, through a fine analysis of the dispersion properties and behavior of resonators introduced in a laboratory scale setup, we propose a strategy for the design ...
Constant, Matthieu Coppin, Nathan Dubois, Frédéric Artoni, Riccardo Lambrechts, Jonathan Legat, Vincent
This paper is devoted to the investigation of the density sorting of grains using water jigging. Experiments achieved in a laboratory scale water jig for two initial binary bed configurations are studied and compared to numerical results. The vertical composition of the deposit is estimated after different number of water pulses to represent the so...
WANG, Zhongzheng PEREIRA, Jean-Michel GAN, Yixiang
BERZI, Diego JENKINS, James T. RICHARD, Patrick
We employ kinetic theory, extended to incorporate the influence of velocity correlations, friction and particle stiffness, and a model for rate-independent, elastic components of the stresses at volume fractions larger than a critical, in an attempt to reproduce the results of discrete-element numerical simulations of steady, fully developed, dissi...
RICHARD, Patrick ARTONI, Riccardo VALANCE, Alexandre DELANNAY, Renaud
The properties of confined granular flows are studied through discrete numerical simulations. Two types of flows with different boundaries are compared: (i) gravity-driven flows topped with a free surface and over a base where erosion balances accretion (ii) shear-driven flows with a constant pressure applied at their top and a bumpy bottom moving ...
LE GUEN, Laurédan HUCHET, Florian
The rotary kiln is widely used for the thermal treatment of granular materials in various industries. A better understanding of the heat transfer phenomena, both inside and outside of the industrial rotary kiln, will lead to developing sustainable production techniques, such as materials recycling and heat waste recovery. The present paper summaris...