Turbulent Dusty Boundary Layer in an ANFO Surface-Burst Explosion
Abstract
This paper describes the results of numerical simulations of the dusty, turbulent boundary layer created by a surface burst explosion. The blast wave was generated by the detonation of a 600-T hemisphere of ANFO, similar to those used in large-scale field tests. The surface was assumed to be ideally noncratering but contained an initial loose layer of dust. The dust-air mixture in this fluidized bed was modeled as a dense gas (i.e., an equilibrium model, valid for very-small-diameter dust particles). The evolution of the flow was calculated by a high-order Godunov code that solves the nonsteady conservation laws. Shock interactions with dense layer generated vorticity near the wall- similar to viscous, no-slip effects found in clean flows. The resulting wall shear layer was unstable, and rolled up into large-scale rotational structures. These structures entrained dense material from the wall layer and created a chaotically striated flow. The boundary layer grew due to merging of the large- scale structures and due to local entrainment of the dense material from the fluidized bed. Surface-Burst Explosions, Convective Mixing Simulations of Turbulent Flow, Dusty Boundary Layer, Fluidized Bed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1992
- Accession Number
- ADA254130
Entities
People
- Allen L. Kuhl
- James P. Collins
- K.-y. Chen
- R. E. Ferguson