Understanding curved detonation waves

Conference · Fri Jan 01 04:00:00 EST 1993

OSTI ID:6188019

Bukiet, B G ^[1]; Lackner, K S; Menikoff, R ^[2]

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1. New Jersey Inst. of Tech., Newark, NJ (United States)
2. Los Alamos National Lab., NM (United States)

The reaction zone of a detonation wave is very small compared to the dynamic length scale for a typical application. Consequently, it is impractical for numerical calculations to fully resolve the reaction zone. A non-zero reaction zone width is critical to describe curved detonation waves because it affects the wave speed. The curvature effect is the result of an the interaction between the rate of energy release and geometric source terms within the reaction zone. When the reaction zone width is determined by the computational cell size rather than the physical scale, the numerics introduces an artificial curvature effect which frequently dominates the physical effect and leads to mesh dependence of simulations. Modified Hugoniot jump conditions are derived which characterize the curvature effect. They express the conservation laws and are not sensitive to the detailed reaction dynamics but instead depend only on the reaction zone width, and averages of pressure and of mass, momentum and energy densities.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6188019
• Report Number(s): LA-UR-93-1723; CONF-930713--15; ON: DE93014581
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
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99 GENERAL AND MISCELLANEOUS
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COMPUTER CALCULATIONS
CONSERVATION LAWS
DETONATION WAVES
FLUID MECHANICS
HYDRODYNAMICS
MECHANICS
NUMERICAL SOLUTION
SHOCK WAVES
WAVE PROPAGATION