Primer and Analysis to EM-TRANAIR Code Execution
Rept. for 29 Nov 1989-31 May 1990
WRIGHT RESEARCH AND DEVELOPMENT CENTER WRIGHT-PATTERSON AFB OH
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EM-TRANAIR is a computer program for solving Maxwells equations in three dimensions. This primer on EM-TRANAIR installation at WRDC and guide to confronted execution problems will aid in understanding the internals of EM- TRANAIR. Successful pathways for accurate converged numerical solutions are possible. The architecture of EM-TRANAIR is briefly presented in a discussion of various installation problems encountered when moving from a CFT compiler to a CFT77 compiler. Compilation problems and solutions deal with passing arguments, dimensioning arrays and boolean algebra and manipulations. Execution problems with the input processor, V1INP and the input solver, V1SOL are presented. Troubleshooting methods and working solutions are revealed. The actual problems needing to be surmounted for successful program execution are the examples contained in this document. Different input configurations are used to establish rule-of-thumb parameters to achieve accurate numerical solutions. Parameters such as incidence frequency, number of mesh points and aspect ratios are discussed. Finally, the area found to be the most successful in the post processing examination was the Rayleigh region. The numerical RCS solutions presented are proof positive that the EM-TRANAIR code is executable and provides good computational RCS results. Keywords Radar cross sections, Subroutines.
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