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  • Other Sources  (2)
  • Lunar and Planetary Science and Exploration  (1)
  • OCEANOGRAPHY  (1)
  • Poly(3-hydroxybutyric acid)
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Keywords
  • Lunar and Planetary Science and Exploration  (1)
  • OCEANOGRAPHY  (1)
  • Poly(3-hydroxybutyric acid)
  • NONMETALLIC MATERIALS  (2)
Years
  • 1
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    Unknown
    Directional measurement of short ocean waves with stereophotography (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Stereophotographs of the sea surface, acquired during the Tower Ocean Wave and Radar Dependence experiment are analyzed to yield directional wave height spectra of short surface waves in the 6-80-cm range. The omnidirectional wave height spectra are found to deviate from the k exp -4 distribution, where k is the wave number. The stereo data processing errors are found to be within + or - 5 percent. The omnidirectional spectra yield 514 deg of freedom for 30-cm-long waves. The directional distribution of short waves is processed with a directional resolution of 30 deg, so as to yield 72 deg of freedom for 30-cm-long waves. The directional distributions show peaks that are aligned with the wind and swell directions. It is found that dynamically relevant measurements can be obtained with stereophotography, after removal of the mean surface associated with long waves.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 13891-13
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Analysis of Mars Pathfinder Entry Data, Aerothermal Heating, and Heat Shield Material Response (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The Mars Pathfinder heatshield contained several thermocouples and resistance thermometers. A description of the experiment, the entry data, and analysis of the entry environment and material response is presented. In particular, the analysis addresses uncertainties of the data and the fluid dynamics and material response models. The calculations use the latest trajectory and atmosphere reconstructions for the Pathfinder entry. A modified version of the GIANTS code is used for CFD (computational fluid dynamics) analyses, and FIAT is used for material response. The material response and flowfield are coupled appropriately. Three different material response models are considered. The analysis of Pathfinder entry data for validation of aerothermal heating and material response models is complicated by model uncertainties and unanticipated data-acquisition and processing problems. We will discuss these issues as well as ramifications of the data and analysis for future Mars missions.
    Keywords: Lunar and Planetary Science and Exploration
    Type: 7th AIAA/ASME Joint Thermophysics and Heat Transfer Conference; Jun 15, 1998 - Jun 18, 1998; Albuquerque, NM; United States
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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