Turbulent dusty boundary layer in an ANFO surface-burst explosion. Technical report 1 Oct 88-31 Dec 89
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.
- Research Organization:
- Logicon R and D Associates, Los Angeles, CA (United States)
- OSTI ID:
- 7077291
- Report Number(s):
- AD-A-254130/8/XAB; CNN: DNA001-88-C-0046; MIPR-91-658
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SURFACE EXPLOSIONS
COMPUTERIZED SIMULATION
AIR
BLAST EFFECTS
BOUNDARY LAYERS
DENSITY
DETONATIONS
DUSTS
FIELD TESTS
INTEGRAL EQUATIONS
MATHEMATICAL MODELS
MIXING
MIXTURES
NUCLEAR EXPLOSIONS
SHOCK WAVES
SURFACES
TURBULENT FLOW
VELOCITY
DISPERSIONS
EQUATIONS
EXPLOSIONS
FLUID FLOW
FLUIDS
GASES
LAYERS
PHYSICAL PROPERTIES
SIMULATION
TESTING
450200* - Military Technology
Weaponry
& National Defense- Nuclear Explosions & Explosives