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https://hdl.handle.net/2440/64776
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Type: | Journal article |
Title: | New stress and velocity fields for highly frictional granular materials |
Author: | McCue, S. Johnpillai, I. Hill, J. |
Citation: | IMA Journal of Applied Mathematics, 2005; 70(1):92-118 |
Publisher: | Oxford Univ Press |
Issue Date: | 2005 |
ISSN: | 0272-4960 1464-3634 |
Statement of Responsibility: | Scott W. Mccue, I. Kenneth Johnpillai and James M. Hill |
Abstract: | The idealized theory for the quasi-static flow of granular materials which satisfy the Coulomb–Mohr hypothesis is considered. This theory arises in the limit as the angle of internal friction approaches π/2, and accordingly these materials may be referred to as being ‘highly frictional’. In this limit, the stress field for both two-dimensional and axially symmetric flows may be formulated in terms of a single nonlinear second-order partial differential equation for the stress angle. To obtain an accompanying velocity field, a flow rule must be employed. Assuming the non-dilatant double-shearing flow rule, a further partial differential equation may be derived in each case, this time for the streamfunction. Using Lie symmetry methods, a complete set of group-invariant solutions is derived for both systems, and through this process new exact solutions are constructed. Only a limited number of exact solutions for gravity-driven granular flows are known, so these results are potentially important in many practical applications. The problem of mass flow through a two-dimensional wedge hopper is examined as an illustration. |
Keywords: | granular materials exact solutions Lie symmetries double-shearing theory highly frictional materials |
Rights: | Copyright Institute of Mathematics and its Applications 2005; all rights reserved. |
DOI: | 10.1093/imamat/hxh054 |
Published version: | http://dx.doi.org/10.1093/imamat/hxh054 |
Appears in Collections: | Aurora harvest Mathematical Sciences publications |
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