Contaminant transport: numerical simulation and comparison to in-flight experiment

Alex Bourdon; Jean-Francois Roussel

doi:10.1117/12.328504

27 October 1998 Contaminant transport: numerical simulation and comparison to in-flight experiment

Alex Bourdon, Jean-Francois Roussel

Proceedings Volume 3427, Optical Systems Contamination and Degradation; (1998) https://doi.org/10.1117/12.328504
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Alex Bourdon and Jean-Francois Roussel "Contaminant transport: numerical simulation and comparison to in-flight experiment", Proc. SPIE 3427, Optical Systems Contamination and Degradation, (27 October 1998); https://doi.org/10.1117/12.328504

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