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What is Particle-Dynamics Calculations of Shear Flow about?

Two-dimensional discrete particle computer models similar to those of P. Cundall (ref. 1,2) are described. The "soft-particle" approach used in these models allows them to be applied over a wide range of conditions from static situations through rapid shear conditions. Surface friction between particles and with boundary walls is explicitly modeled. Particular attention is paid to the modeling of dynamic situations wherein the energy losses and momentum transfer during inter-particulate collisions play important roles. Comparisons with analytic solutions have verified the numerical techniques and direct comparison with physical tests involving several particles have veri fied the models' ability to calculate the motion of real materials. Direct shear tests on oil shale rubble and corresponding calculations indicate quali tatively similar circulation phenomena and both showed large fluctuations in the magnitude of the shearing force. Incline chute flow calculations are providing detailed descriptions of individual particle paths in which shearing and size segregation phenomena can be observed. Initial comparisons with experiments indicate somewhat slower segregation in two-dimension

Author

O.R. WALTON

Published

1983

Language

EN