Presented by: 
Dr. Gary Delaney (CSIRO)
Mon 27 Aug, 2:00 pm - 3:00 pm
N202 Hawken(50)

Granular materials are particle systems in which the sizes of the constituents are large enough that they are not subject to thermal motion fluctuations. Typical grain sizes range from micrometer up to tectonic scales. These materials are everywhere and the capability to handle, process, store and produce them is of paramount importance. From a fundamental point of view, the science of granular matter is very exciting and puzzling. While these materials are composed of simple elements that interact with known laws, their behaviors and properties are complex. Granular materials can flow, but with different hydrodynamic properties than classical fluids; they can support weight, but stress does not distribute as in a homogeneous solid.

We utilize discrete particle simulation methods and a range of different preparation methods to generate disordered packed granular systems composed of non-spherical particles. We consider systems ranging from the densest disordered to the loosest mechanically stable packings. By employing a range of order parameters, we are able to quantify how features of the individual grain shapes affect the properties of the system in the packed state. The role of anisotropy and broken rotational symmetry in the individual particle shapes will be discussed. Applications of discrete particle modeling to simulating a broad range of natural and industrial systems will also be presented.