Development of an Artificial Viscosity Function.

Abstract

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. (Author)

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1977
Accession Number
ADA048778

Entities

People

  • Charles E. Needham
  • Henry J. Happ Iii
  • Peter W. Lunn

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Coefficients
  • Government Procurement
  • Governments
  • Leading Edges
  • New Mexico
  • Overpressure
  • Reflection
  • Specific Heat
  • Square Waves
  • Standards
  • Viscosity
  • Waveforms
  • Wavefronts
  • Waves

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Explosive Engineering.
  • Fluid Dynamics.