Unstable wall layers created by shock reflections from wedges

Conference · Tue Nov 19 00:00:00 EST 1991

OSTI ID:10119861

Kuhl, A L ^[1]; Ferguson, R E; Chien, K Y; Collins, P ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Naval Surface Warfare Center, Silver Spring, MD (United States)

This paper describes numerical simulations of the unstable wall layer created by the reflection of planar shock waves from wedges. Four cases were considered: a normal shock case, a regular-reflection case, a single-Mach-reflection case, and a double-Mach-reflection case. It was assumed that the wedge contained an initial dense layer, similar to those formed in dusty boundary layers. Shock interactions with the dense layer created vorticity near the wall by the baroclynic mechanism. The wall shear layer was unstable, and rolled up into vortical structures that entrained mass from the fluidized bed. This led to a chaotically striated mixing layer. The flow field was time-averaged in similarity coordinates (i.e., lines of constant r/t and z/t) to establish the mean and fluctuating-flow profiles of the wall layer. Analysis of the results showed that the wall-layer thickness {delta} grew as a power-law function of the distance behind the shock: {delta} {approximately} {xi}{sup 3/5}, and the mass entrainment rate decayed with distance behind the shock ({dot m}{sub 0} {approximately} {xi}{sup {minus}2/5}). 18 refs.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); Defense Nuclear Agency, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10119861
• Report Number(s): UCRL-JC-107174; CONF-9107160-2; ON: DE92007364; CNN: Grant IACRO 91-853
• Resource Relation: Conference: 13. international colloquium on dynamics of explosives and reactive systems,Nagoya (Japan),28 Jul - 31 Aug 1991; Other Information: PBD: 19 Nov 1991
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
SHOCK WAVES
COMPUTERIZED SIMULATION
BOUNDARY LAYERS
TURBULENCE
SHOCK TUBES
WAVE PROPAGATION
ANALYTICAL SOLUTION
NUMERICAL SOLUTION
665000
990200
PHYSICS OF CONDENSED MATTER
MATHEMATICS AND COMPUTERS