Granular flow: advanced research and technology development (AR and TD) contract review
The objective of the granular flow project is to develop an understanding for and an ability to predict the flow behavior of granular solids. New research tools are being developed as part of this task in the form of new two- and three-dimensional discrete particle computer models that can provide detailed information on both the microscopic and macroscopic deformations occurring in flowing granular solids. These computer models calculate the motion of each individual particle in an assembly of many inelastic, frictional particles responding to applied loads, boundaries and/or gravity. New interparticulate force models have been developed that realistically simulate collision behavior between spheres and disks under rapid shearing conditions. A new two-dimensional steady-state shearing model, using periodic boundaries on all sides of a primary calculational cell has been used to determine the rheologic properties of assemblies of disks and the dependence of these rheologic properties on the shear rate, and on the inelasticity and surface friction properties of the disks. Real boundaries and gravity have recently been added to this two-dimensional model. Three-dimensional steady-state shearing and real boundary models with spherical particles are under development. When these are completed direct comparisons can be made between various existing laboratory studies and the three-dimensional computer simulations. 8 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5286927
- Report Number(s):
- UCRL-92992; CONF-850878-5; ON: DE85017267
- Country of Publication:
- United States
- Language:
- English
Similar Records
Granular Flow Project. Quarterly report, July-September 1985. [Discs and spheres]
Lawrence Livermore National Laboratory Granular Flow Project. Quarterly report, January-March 1986
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COMPUTERIZED SIMULATION
FLOW MODELS
FLUID FLOW
GRANULAR MATERIALS
MATERIALS
MATHEMATICAL MODELS
RHEOLOGY
SHEAR
SIMULATION
SOLIDS FLOW
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS
VISCOSITY