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Rarefaction effects on Galileo probe aerodynamicsSolutions of aerodynamic characteristics are presented for the Galileo Probe entering Jupiter's hydrogen-helium atmosphere at a nominal relative velocity of 47.4 km/s. Focus is on predicting the aerodynamic drag coefficient during the transitional flow regime using the direct simulation Monte Carlo (DSMC) method. Accuracy of the probe's drag coefficient directly impacts the inferred atmospheric properties that are being extracted from the deceleration measurements made by onboard accelerometers as part of the Atmospheric Structure Experiment. The range of rarefaction considered in the present study extends from the free molecular limit to continuum conditions. Comparisons made with previous calculations and experimental measurements show the present results for drag to merge well with Navier-Stokes and experimental results for the least rarefied conditions considered.
Document ID
19960044628
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Moss, James N. (NASA Langley Research Center Hampton, VA United States)
LeBeau, Gerald J. (NASA Langley Research Center Hampton, VA United States)
Blanchard, Robert C. (NASA Langley Research Center Hampton, VA United States)
Price, Joseph M. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
August 24, 1996
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.15:111620
NASA-TM-111620
Report Number: NAS 1.15:111620
Report Number: NASA-TM-111620
Accession Number
96N32089
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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