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Proceedings Paper

Modeling of spacecraft using a modified version of MOLFLUX and comparison with a continuous flux model
Author(s): David A. Brent; Frederick D. Cottrell; Kelly A. Henderson; Rudy S. Dahbura
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Paper Abstract

The industry-standard, free-molecular contamination code MOLFLUX (molecular flux) developed for NASA has been used for many years by most aerospace contractors to predict on- orbit spacecraft surface contamination levels. Recently, MOLFLUX (version 2.0) which was written for a VAX computer was converted for use on a PC running Windows NT. Both the graphical-user-interface (GUI) menuing portion (written in C) of MOLFLUX), and the physics portion (written in FORTRAN) were fully converted. Subsequent to the conversion task, an effort was initiated to validate the PC version of MOLFLUX for two major spacecraft systems. A new free-molecular contamination code recently developed at TRW, CONFLUX (continuous flux) is being used to validate MOLFLUX. CONFLUX provides a 'nearly-exact' solution to the 'reduced' free- molecular contamination problem by permitting molecules to bounce from surface-to-surface with no bounce limit. CONFLUX is also double-precisioned for higher accuracy. Excellent comparisons have been made between MOLFLUX and CONFLUX on the AXAF and EOS spacecraft systems (discretized into hundreds of surface elements). Both models are also being verified against simple systems having closed-form analytic solutions. In addition the S-cubed environmental work bench (EWB) is being tested on the EOS spacecraft system. All comparisons are still in a preliminary state.

Paper Details

Date Published: 11 November 1996
PDF: 9 pages
Proc. SPIE 2864, Optical System Contamination V, and Stray Light and System Optimization, (11 November 1996); doi: 10.1117/12.258300
Show Author Affiliations
David A. Brent, TRW Space & Electronics Group (United States)
Frederick D. Cottrell, TRW Space & Electronics Group (United States)
Kelly A. Henderson, TRW Space & Electronics Group (United States)
Rudy S. Dahbura, TRW Space & Electronics Group (United States)

Published in SPIE Proceedings Vol. 2864:
Optical System Contamination V, and Stray Light and System Optimization
Robert P. Breault; A. Peter M. Glassford; Stephen M. Pompea; Robert P. Breault; Stephen M. Pompea, Editor(s)

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