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    Modeling Reaction Control System Effects on Mars Odyssey (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: During the Mars 2001 Odyssey aerobraking mission, NASA Langley Research Center performed 6 degree of freedom (6-DOF) simulations to determine rotational motion of the spacecraft. The main objective of this study was to assess the reaction control system models and their effects on the atmospheric flight of Odyssey. Based on these models, a comparison was made between data derived from flight measurements to simulated rotational motion of the spacecraft during aerobraking at Mars. The differences between the simulation and flight derived Odyssey data were then used to adjust the aerodynamic parameters to achieve a better correlation.
    Keywords: Numerical Analysis
    Type: NASA/CR-2002-211767 , NAS 1.26:211767 , ICASE-2002-31
    Format: application/pdf
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  • 2
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    Adaptive domain decomposition for Monte Carlo simulations on parallel processors (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method is described for performing direct simulation Monte Carlo (DSMC) calculations on parallel processors using adaptive domain decomposition to distribute the computational work load. The method has been implemented on a commercially available hypercube and benchmark results are presented which show the performance of the method relative to current supercomputers. The problems studied were simulations of equilibrium conditions in a closed, stationary box, a two-dimensional vortex flow, and the hypersonic, rarefied flow in a two-dimensional channel. For these problems, the parallel DSMC method ran 5 to 13 times faster than on a single processor of a Cray-2. The adaptive decomposition method worked well in uniformly distributing the computational work over an arbitrary number of processors and reduced the average computational time by over a factor of two in certain cases.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: International Symposium on Rarefied Gas Dynamics; Jul 08, 1990 - Jul 14, 1990; Aachen; Germany
    Format: text
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