Development of an Artificial Viscosity Function.
AIR FORCE WEAPONS LAB KIRTLAND AFB NM
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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
- Fluid Mechanics