by Joe Goddard
 
 

This talk provides an overview of granular mechanics, followed by

a discussion of research on rapid granular flow in, or near, the so-called

"Bagnold grain-inertia" regime. The emphasis will be on two particularly

interesting subjects: 1."Faraday" patterns in vibrated granular layers,

including recent efforts of the speaker to develop an appropriate fluid-

mechanical model, and 2. the analysis of clustering instabilities in rapid

shear flow by the speaker and coworkers, according to a standard fluid

model. The first work is motivated by the the remarkable patterns observed

experimentally in vertically vibrated granular layers, notably by H.

Swinney, P. Umbanhowar et al. (with websites:

http://chaos.ph.utexas.edu/research/granular/granular.html and

http://pubweb.nwu.edu/~pum701/. The second work relates to the basic

theoretical issue of proper constitutive models for materially unstable

media.
 
 

Joe Goddard Tel./Fax: (858)534 4508/4543

Dept. MAE Email: jgoddard@ucsd.edu

University of California, SD

9500 Gilman Drive

La Jolla, CA 92093-0411