Comparison Between a Von Neumann-Richtmyer Hydrocode (AFWL's PUFF) and a Lax-Wendroff Hydrocode
Abstract
A comparison between two one-dimensional Lagrangian hydrocodes has been made. The two hydrocodes are a von Neumann-Richtmyer hydrocode (AFWL's PUFF) and a Lax-Wendroff hydrocode (the two-step version with artificial viscosity). The comparison was made by applying the hydrocode test problems as described in HYDROCODE TEST PROBLEMS, AFWL-TR-67-127, February 1968. The most apparent difference between the von Neumann-Richtmyer hydrocode and the Lax- Wendroff is the greater tendency of the Lax-Wendroff scheme to oscillate. In those flows in which there are no strong shocks or strong rarefactions or vacuums, the Lax-Wendroff scheme is more accurate. However, in those flows in which there are strong shocks or strong rarefactions or vacuums the von Neumann- Richtmyer scheme is more accurate. The Lax-Wendroff scheme cannot handle vacuums because of the use of specific volume instead of the density as a fluid variable. It appears that it might be possible to combine the better features of the von Neumann-Richtmyer and the Lax-Wendroff schemes to produce a better hydrocode.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1968
- Accession Number
- AD0842402
Entities
People
- Darrell Hicks
- Robert Pelzl
Organizations
- Air Force Research Laboratory