[PDF] Simulation of Plume-Spacecraft Interaction

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Abstract:

When the plume of a thruster impinges on spacecraft surfaces and in-struments, the ow is either in the transitional or the free-molecular regime. The standard method to simulate the transitional regime is Direct Simulation Monte-Carlo, which simulates free-molecular gases too. In order to improve Astrium’s capabilities and exibility for plume-spacecraft interaction analy- sis, the DSMC code DS3V was interfaced with the Astrium tool for thruster’s plume computation PLUMFLOW and with a commercial 3D modeler. This has allowed Astrium to perform plume impingement analysis in complex con- gurations such as instrument cavities in the Bepi-Colombo spacecraft.

The Astrium tool SYSTEMA/PLUME uses a simplied and fast approach to perform the same kind of analysis. In order to asses its accuracy, SYS- TEMA/PLUME results were compared with DS3V results in a conguration where the ow is in the transitional regime. The SYSTEMA/PLUME approach is based on the assumption that the ow is in the free-molecular regime so as the ow becomes less rareed, the results become less accurate. However, both method showed good agreement and the deviation between the predicted plume impingement eects was less than 15% .

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