A study has been made of the flow of granular materials under the acti
on of gravity in a vertical channel, using a continuum model to descri
be the response of the granular material. The equations governing the
flow are solved numerically, under the assumption of both slip and no-
slip at the wall, and the results compared with the experimental data
of Savage [J. Fluid Mech., 93 (1979) 53].