Granular Flow Project. Quarterly report, April-June 1986
- ed.
Discrete particle computer models are being utilized in the Granular Flow Project at Lawrence Livermore National Laboratory (LLNL) to study the deformation and flow behavior of granular solids. These direct simulation models follow the motion of each inelastic, frictional particle in an assembly as it interacts with the other particles in the system and/or the boundaries. During the past year the models for the configurations, particles and interaction forces have continued to become more realistic as we developed and improved our simulation techniques. During the current reporting period we continued calculating the properties of systems of equal-sized, inelastic, frictional spheres undergoing steady shear with periodic boundaries on all sides. These calculations are producing shear and normal stress values that are very close to measured values obtained in annular shear cell tests of blass beads. The capability to calculate systems containing a distribution of sphere sizes has been added to the 3DSHEAR model and a study of steady shearing of binary mixtures has been initiated. Coding for real boundaries on up to four sides of the calculational cell is being written and we have added velocity damping to the Hertzian contact force model to more realistically describe velocity-dependent coefficients of restitution. We have also begun examining the feasibility of modifying a rigid-body molecular-dynamics program to include inelastic, frictional particles. Such a model will allow us to perform calculations of many configurations using as little as one-tenth of the computer time of our current models.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5054464
- Report Number(s):
- UCID-20297-86-2; ON: DE87000906
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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