The Discrete Particle Method (DPM) is a very powerful computational tool that allows the simulation of granular masses with complex interactions, arbitrary shapes, in arbitrary geometries, by solving Newton's laws for each particle. DPM simulations provide full, detailed data of the internal flow behaviour, non-scalar modes of wave propagation, allowing specific issues to be observed and resolved in a manner not possible with physical models or observational techniques. The method has been instrumental in understanding complex geophysical phenomena, such as erosion and deposition, fluid flow through faults and permeable rock, earth quakes, shear zones, dispersion, scattering and intrinsic attenuation, etc. By the end of this course, you will have a basic understanding of the capabilities of computational modelling, and know how to apply it to the system of your choice.