Discrete particle computer methods for modeling granular flow
Recent adaptations of molecular-dynamics-like techniques to systems of inelastic, frictional particles are being used to probe the details of granular flow behavior. A variety of calculational approaches are beng pursued including: rigid-particle, soft-particle, suspended particle and Monte Carlo flow simulations. Much such calculational efforts have investigated only relatively simple configurations to date, such as assemblies of equal-sized circular particles restricted to motion in a single plane. Periodic boundaries are often used to allow simulation of semi-infinite systems with a relatively small number of particles. A few models have been extended to three-dimensions with inelastic, frictional spheres. Where comparisons have been possible, agreement with experiments and with some theories have been good. In many circumstances the numerical simulations are providing heretofore unavailable information on the micromechanisms occurring in deforming granular materials. These details include stress networks in quasistatic deformations, residual internal stresses in unloaded assemblies, shear layers in high density rapid shearing flows and highly anisotropic deviatoric velocity distributions and large normal stress differences in rapid shearing flows at low solids concentrations. Various approaches and their results are briefly reviewed.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5764831
- Report Number(s):
- UCRL-92436; CONF-860625-1; ON: DE86005202
- Resource Relation:
- Conference: American Society of Civil Engineers meeting on advancements in aerodynamics, fluid mechanics and hydraulics, Minneapolis, MN, USA, 3 Jun 1986
- Country of Publication:
- United States
- Language:
- English
Similar Records
Viscosity, granular-temperature, and stress calculations for shearing assemblies of inelastic, frictional disks
Viscosity, granular-temperature, and stress calculations for shearing assemblies of inelastic, frictional disks