#### Finite and Discrete Elements, Multiphysics and
Granular Flows

Noel Barton

We describe recent progress on two computational tools
under development in CSIRO Mathematical and Information Sciences. Both these tools are designed to be
applicable for simulations and engineering design purposes. The first tool is Fastflo,
a finite element solver for systems of Partial Differential Equations (PDEs). This package
is especially suited for multiphysics problems in
which there is a strong coupling between different physical mechanisms. Moreover, it is common that the domain
changes with time, and the evolution must be computed
as part of the problem. A good example,
although there are many others, is fluid-structure interaction. The second tool is a Discrete Element Method
(DEM) package for simulation of flowing granular material. In this method, the motion of all particles
in the granular material is described using a specified model for particle-particle
and particle-boundary impacts. This
gives a system of ordinary differential equations that can be marched forward
in time. We will show typical recent
results such as for ploughshare mixers and grinding mills. Finally, we will discuss how we have made the
DEM technology available over the internet in the particular case of autogenous (AG) and semi-autogenous
grinding (SAG) mills.