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Proceedings Paper

Contaminant transport: numerical simulation and comparison to in-flight experiment
Author(s): Alex Bourdon; Jean-Francois Roussel
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Paper Abstract

Understanding contaminant transport is fundamental to predict a possible contamination of spacecraft optics or other subsystem. A numerical modeling of EOIM-III STS-46 experiment environment was performed in order to understand how contaminant transport could be responsible for some of the observations. A DSMC model for collisions was developed to simulate collisions, and an empirical lobular model were used to simulate reflections on shuttle surfaces. Molecular dynamics was then modeled on two different scales: 1- a large computation box allowed to simulate return flux from outgassing into shuttle bay, 2- a detailed mesh of shuttle bay allowed to simulate local processes at materials and mass spectrometer level. In spite of the lack of experimental data about contaminant production rates, some quantitative predictions and comparisons could be performed using EOIM data about the flux into the bay and the fluxes from the materials, with or without baffle, which proved quite conclusive.

Paper Details

Date Published: 27 October 1998
PDF: 11 pages
Proc. SPIE 3427, Optical Systems Contamination and Degradation, (27 October 1998); doi: 10.1117/12.328504
Show Author Affiliations
Alex Bourdon, ONERA-CERT (France)
Jean-Francois Roussel, ONERA-CERT (France)

Published in SPIE Proceedings Vol. 3427:
Optical Systems Contamination and Degradation
Philip T. C. Chen; William E. McClintock; Gary J. Rottman, Editor(s)

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