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Comparisons of the Maxwell and CLL gas/surface interaction models using DSMCThe behavior of two different models of gas-surface interactions is studied using the Direct Simulation Monte Carlo (DSMC) method. The DSMC calculations examine differences in predictions of aerodynamic forces and heat transfer between the Maxwell and the Cercignani-Lampis-Lord (CLL) models for flat plate configurations at freestream conditions corresponding to a 140 km orbit around Venus. The size of the flat plate represents one of the solar panels on the Magellan spacecraft, and the freestream conditions correspond to those experienced during aerobraking maneuvers. Results are presented for both a single flat plate and a two-plate configuration as a function of angle of attack and gas-surface accommodation coefficients. The two-plate system is not representative of the Magellan geometry but is studied to explore possible experiments that might be used to differentiate between the two gas-surface interaction models. The Maxwell and CLL models produce qualitatively similar results for the aerodynamic forces and heat transfer on a single flat plate. However, the flow fields produced with the two models are qualitatively different for both the single-plate and two-plate calculations. These differences in the flowfield lead to predictions of the angle of attack for maximum heat transfer in a two plate configuration that are distinctly different for the two gas-surface interactions models.
Document ID
19960009098
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hedahl, Marc O. (NASA Langley Research Center Hampton, VA, United States)
Wilmoth, Richard G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1995
Subject Category
Spacecraft Design, Testing And Performance
Report/Patent Number
NASA-TM-110205
NAS 1.15:110205
NIPS-95-06529
Accession Number
96N16264
Funding Number(s)
PROJECT: RTOP 242-20-08-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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