Team 3: Contact Algorithms for Dry Granular Flow with Elastic Grains

Monday, August 1, 2005 - 10:20am - 10:40am
EE/CS 3-180
Petri Fast (Lawrence Livermore National Laboratory)
Consider the dynamics of interacting elastic disks in the plane. This is an experimentally realizable 2-d model of dry granular flow where the stresses can be visualized using the photoelastic effect. As the elastic disks move in a vacuum they interact through collisions with each other and with the surrounding geometry. Because of the finite propagation speed of deformations inside each grain it can be difficult to capture computationally even simple experiments involving just a few interacting grains.

The goal of this project is to improve our ability to simulate dense granular flow in complex geometry.

Some project ideas: (A) Pursue full numerical simulations of of the interacting elastic disks driven by contact mechanics. (B) Develop simplified discrete element models for tracking the center of mass of each disk using classical mechanics including heuristics for the delay arising from the finite propagation speed of elastic deformations in each disk. (C) Compare with experimental data.