Development of an artificial viscosity function. Final report

Technical Report · Thu Sep 01 00:00:00 EDT 1977

OSTI ID:7092590

Lunn, P W; Happ, III, H J; Needham, C E

The hydrodynamics code HULL used by the Air Force Weapons Laboratory (AFWL) uses the Von Neumann-Richtmeyer method to maintain stability in the numerical computation of a propagating shock. This method adds a pseudoviscous term to the pressure in a compression region. Care is needed in the application of this method, however. Too little artificial viscosity will not maintain stability. Too much will 'smear' the shock over many zones, making the shock practically continuous. The AFWL has developed a relation which expresses the linear viscosity coefficient as a function of maximum density. The effect of this variable viscosity coefficient is to maintain stability while limiting the smear to 10 zones for overpressure levels of 2 psi to 1200 psi in air.

• Research Organization: Air Force Weapons Lab., Kirtland AFB, N.Mex. (USA)
• OSTI ID: 7092590
• Report Number(s): AD-A-048778; AFWL-TR-77-53
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450200* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosions & Explosives
COMPUTER CODES
DENSITY
EXPLOSIONS
H CODES
NUCLEAR EXPLOSIONS
PHYSICAL PROPERTIES
PRESSURE GRADIENTS
SHOCK WAVES
VISCOSITY
WAVE PROPAGATION