ARCHON Technical Reference and User Manual ARCHON58.
Abstract
This combined report on ARCHON58 is an update to the earlier report on ARCHON22 (DNA-TR-89-65-Vl&2). The earlier report consisted of two volumes, volume 1 being a detailed description of ARCHON and the ARCHON reaction rate data set listing, and volume 2 being the user guide to ARCHON. There have been significant updates to both the ARCHON code and to the reaction rate data set. Updates to the ARCHON code itself has been primarily to address run time efficiencies and inadequacies in the former code - there is a speed-up factor of 20-50 with ARCHON58 over ARCHON22. This speed-up is primarily attributable to modifications to the integration technique and the addition of a user-specified option to substitute the GEAR integrator method. One of the more important changes is the addition of a variable time step routine which has been added so that when ARCHON senses a rapid change in a driver parameter (temperature, density, e.g. shock wave), the time step is reduced accordingly. The "standard" ARCHON reaction rate data set is now called ARD_5. set and has been significantly updated. It now consists of over 9000 reactions involving over 400 species. Several corrections have been made to the original ARCHON file and significant additions have been made in electron impact dissociation and ionization and in molecular nitrogen electronic excitation to the "A", "B" and "C" states of the neutral and the "A" and the "B" states of the ion. Additions have also been made in the area of negative ion and electron-impact reaction rates.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1998
- Accession Number
- ADA354412
Entities
People
- Russell A. Armstrong