LLNL Granular Solids Flow Project: Quarterly report, April--June 1988

Technical Report · Mon Aug 01 04:00:00 EDT 1988

OSTI ID:6787460

Walton, O R ^[1]

---

1. ed.

Research under this project is directed toward obtaining a microstructural understanding of the deformation and flow behavior of granular materials and the rheology of suspensions. Development has been continued of a general method to calculate the hydrodynamic interactions of spheres in suspensions, extending this method to numerically evaluate the effective viscosity of assemblies of freely-moving spheres in a nearly static fluid. During this reporting period the new results include calculations of the viscosity for a suspension of freely-moving spheres, whose structure is not affected by the hydrodynamic forces. Future extensions of this work will include full coupling of the hydrodynamic forces to the particle motions. Numerical modeling of dry granular solids in rapid shearing flows have been continued including simulation of a series of inclined channel flow tests being conducted at UCLA. New calculations with a corrected gap width between the vertical side walls are in substantial agreement with the experiments. Sensitivity of the results to variations in such parameters as the boundary friction coefficient, and number density of particles per unit length during nearly steady flow are being determined. The response of a fractured rock bed to an expanding explosion cavity utilizing a previously developed two-dimensional, polygonal particle mode was simulated. These calculations demonstrated that the dilatent forces acting during initial shearing of a compact assembly of fractured rock can significantly affect the resulting trajectories, and thus, the final crater size and shape. Gaining a more thorough understanding of such effects may lead to improved methods for explosive fragmentation of oil shale and other mineral resources.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6787460
• Report Number(s): UCID-20297-88-2; ON: DE89001282
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300 -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
04 OIL SHALES AND TAR SANDS
040300 -- Oil Shales & Tar Sands-- Drilling
Fracturing & Mining
99 GENERAL AND MISCELLANEOUS
990230 -- Mathematics & Mathematical Models-- (1987-1989)
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
COAL
COMMINUTION
COMPUTERIZED SIMULATION
DEFORMATION
DOCUMENT TYPES
ENERGY SOURCES
EXPLOSIVE FRACTURING
FLOW MODELS
FLUID FLOW
FLUID MECHANICS
FOSSIL FUELS
FRACTURING
FUELS
GRANULAR MATERIALS
HYDRODYNAMICS
LAWRENCE LIVERMORE LABORATORY
MATERIALS
MATHEMATICAL MODELS
MECHANICS
NATIONAL ORGANIZATIONS
OIL SHALES
PROGRESS REPORT
RESEARCH PROGRAMS
ROCK BEDS
ROCK-FLUID INTERACTIONS
SIMULATION
US AEC
US DOE
US ERDA
US ORGANIZATIONS
VISCOSITY