Publications de Marco Ramaioli

Coupled tomography and distinct-element-method approach to exploring the granular media microstructure in a jamming hourglass

Michel Tsukahara, Thomas Liebling, Giorgio Margaritondo, Michaël Unser, Daniel Sage, Lionel Pournin, Marco Ramaioli, Vincent Gajdosik, Slobodan Mitrovic

We describe an approach for exploring microscopic properties of granular media that couples x-ray microtomography and distinct-element-method (DEM) simulations through image analysis. We illustrate it via the study of the intriguing phenomenon of instant a ...

APS2008

Granular flow simulations and experiments for the food industry

Marco Ramaioli

Granular media are omnipresent in the food industry, whether as raw materials, intermediate or final products. While a lot has been done already in modelling food processes dealing with liquids, solid and gases, very little exists until now in granular flo ...

EPFL2008

About the influence of friction and polydispersity on the jamming behavior of bead assemblies

Thomas Liebling, Lionel Pournin, Marco Ramaioli

We study the jamming of bead assemblies placed in a cylindrical container whose bottom is pierced with a circular hole. Their jamming behavior is quantified here by the mean critical diameter, that is the diameter of the hole for which the jamming probabil ...

EDP Sciences, Springer2007

Vertical ordering of rods under vertical vibration

Thomas Liebling, Lionel Pournin, Marco Ramaioli

Granular media composed of elongated particles rearrange and order vertically upon vertical vibration. We perform pseudo-two-dimensional discrete element model simulations and show that this phenomenon takes place also with no help from vertical walls. We ...

2007

Numerical and experimental investigation of alignment and segregation of vibrated granular media composed of rods and spheres

Thomas Liebling, Lionel Pournin, Marco Ramaioli

Homogenous granular media composed of spherocylindrical rods rearrange and order vertically upon vibration. Performing pseudo-bidimensional experiments and simulations, we isolated void-filling mechanism as a cause for this phenomenon, independently of wal ...

A.A.Balkema Publishers2005

Three-dimensional distinct element simulation of spherocylinder crystallization

Michel Tsukahara, Jean-Albert Ferrez, Thomas Liebling, Lionel Pournin, Marco Ramaioli

We present a three-dimensional distinct element model (DEM) able to handle populations of spherocylinders. We report on granular crystallization occurring when vibrating mono-disperse assemblies of spherocylinders that faithfully reproduce the correspondin ...

Springer-Verlag2005