Particle-dynamics calculations of shear flow

Conference · Sun Aug 01 04:00:00 EDT 1982

OSTI ID:6487414

Walton, O R

Two-dimensional discrete particle computer models similar to those of P. Cundall 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 verified the models' ability to calculate the motion of real materials. Direct shear tests on oil shale rubble and corresponding calculations indicate qualitatively 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-dimensional calculations than in experiments with spherical particles. 5 figures.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6487414
• Report Number(s): UCRL-88560; CONF-820843-3; ON: DE83005446
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580100 -- Geology & Hydrology-- (-1989)
640410* -- Fluid Physics-- General Fluid Dynamics
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
ENERGY SOURCES
FOSSIL FUELS
FRICTION
FUELS
GRANULAR MATERIALS
MASS TRANSFER
MATERIALS
MATHEMATICAL MODELS
OIL SHALES
PARTICLE SIZE
PARTICLES
SEGREGATION
SHEAR
SIZE