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  • 1
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    World Wide Web Access to Radiation Datasets for Environmental and Climate Change Studies (2000)
    American Meteorological Society
    Details
    Publication Date: 2000-11-01
    Print ISSN: 0003-0007
    Electronic ISSN: 1520-0477
    Topics: Geography , Physics
    Published by American Meteorological Society
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    PAPER CURRENT
  • 2
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    Shock interference prediction using direct simulation Monte Carlo (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 29; 6; p. 780-785.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    DSMC Grid Methodologies for Computing Low-Density, Hypersonic Flows About Reusable Launch Vehicles (1996)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Two different grid methodologies are studied for application to DSMC simulations about reusable launch vehicles. One method uses an unstructured, tetrahedral grid while the other uses a structured, variable-resolution Cartesian grid. The relative merits of each method are discussed in terms of accuracy, computational efficiency, and overall ease of use. Both methods are applied to the computation of a low-density, hypersonic flow about a winged single-stage-to-orbit reusable launch vehicle concept at conditions corresponding to an altitude of 120 km. Both methods are shown to give comparable results for both surface and flowfield quantities as well as for the overall aerodynamic behavior. For the conditions simulated, the flowfield about the vehicle is very rarefied but the DSMC simulations show significant departure from free-molecular predictions for the surface friction and heat transfer as well as certain aerodynamic quantities.
    Keywords: Launch Vehicles and Launch Operations
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Evaluation of Time-Averaged CERES TOA SW Product Using CAGEX Data (1998)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: A major component in the analysis of the Earth's radiation budget is the recovery of daily and monthly averaged radiative parameters using noncontinuous spatial and temporal measurements from polar orbiting satellites. In this study, the accuracy of the top of atmosphere (TOA) shortwave (SW) temporal interpolation model for the Clouds and the Earth's Radiant Energy System (CERES) is investigated using temporally intensive half-hourly TOA fluxes from the CERES/ARM/GEWEX Experiment (CAGEX) over Oklahoma (Charlock et al., 1996).
    Keywords: Meteorology and Climatology
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Radiation modeling with direct simulation Monte Carlo (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Improvements in the modeling of radiation in low density shock waves with direct simulation Monte Carlo (DSMC) are the subject of this study. A new scheme to determine the relaxation collision numbers for excitation of electronic states is proposed. This scheme attempts to move the DSMC programs toward a more detailed modeling of the physics and more reliance on available experimental data. The new method is compared with the current modeling technique and both techniques are compared with available data. The differences in the results are evaluated. The test case is based on an AVCO-Everett shock tube experiment, a 10-km/s standing shock wave in air at 0.1 Torr. The new method agrees with the available data as well as the results from the earlier scheme and is more easily extrapolated to different flow conditions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 91-1409
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Monte Carlo simulation of a near-continuum shock-shock interaction problem (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A complex shock interaction is calculated with direct simulation Monte Carlo (DSMC). The calculation is performed for the near-continuum flow produced when an incident shock impinges on the bow shock of a 0.1 in. radius cowl lip for freestream conditions of approximately Mach 15 and 35 km altitude. Solutions are presented both for a full finite-rate chemistry calculation and for a case with chemical reactions suppressed. In each case, both the undisturbed flow about the cowl lip and the full shock interaction flowfields are calculated. Good agreement has been obtained between the no-chemistry simulation of the undisturbed flow and a perfect gas solution obtained with the viscous shock-layer method. Large differences in calculated surface properties when different chemical models are used demonstrate the necessity of adequately representing the chemistry when making surface property predictions. Preliminary grid refinement studies make it possible to estimate the accuracy of the solutions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-2862
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Shock interference prediction using direct simulation Monte Carlo (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The shock interaction produced when an incident shock impinges on an inlet cowl lip is investigated for a cowl lip radius of 0.1 in. and flight conditions of Mach 15 and 35-km altitude. This problem is of interest in the design of hypersonic flight vehicles because the interference heating at the cowl lip surface from such a shock interaction is expected to be very high and the design of adequate thermal protection in this region will be challenging. Noncontinuum effects may be significant at this combination of altitude and small dimensions. If this is so, a computational solution based on the Navier-Stokes equations could significantly overpredict the surface heating on the cowl lip. Therefore, a kinetic theory solution technique, direct simulation Monte Carlo (DSMC), is used to predict the flowfield and surface heating. The details of modeling this problem and some preliminary results are presented. The same qualitative flow patterns are seen with DSMC and a continuum solution of the shock interference case, but the peak heating predicted with DSMC is somewhat lower.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 92-0492
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Direct simulation of reentry flows with ionization (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Direct Simulation Monte Carlo (DSMC) method is applied in this paper to the study of rarefied hypersonic reentry flows. The assumptions and simplifications involved with the treatment of ionization, free electrons and the electric field are investigated. A new method is presented for the calculation of the electric field and handling of charged particles with DSMC. In addition, a two-step model for electron impact ionization is implemented. The flowfield representing a 10 km/sec shock at an altitude of 65 km is calculated. The effects of the new modeling techniques on the calculation results are presented and discussed.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 90-0144
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Earth Radiation Budget Experiment (ERBE) Data Sets for Global Environment and Climate Change Studies (1997)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: For a number of years there has been considerable interest in the earth's radiation budget (ERB) or energy balance, and entails making the best measurements possible of absorbed solar radiation, reflected shortwave radiation (RSW), thermal outgoing longwave radiation (OLR), and net radiation. ERB data are fundamental to the development of realistic climate models and studying natural and anthropogenic perturbations of the climate. Much of the interest and investigations in the earth's energy balance predated the age of earth-orbiting satellites (Hunt et al., 1986). Beginning in the mid 1960's earth-orbiting satellites began to play an important role in making measurements of the earth's radiation flux although much effort had gone into measuring ERB parameters prior to 1960 (House et al., 1986). Beginning in 1974 and extending until the present time, three different satellite experiments (not all operating at the same time) have been making radiation budget measurements almost continually in time. Two of the experiments were totally dedicated to making radiation budget measurements of the earth, and the other experiment flown on NOAA sun-synchronous AVHRR weather satellites produced radiation budget parameters as a by-product. The heat budget data from the AVHRR satellites began collecting data in June 1974 and have operated almost continuously for 23 years producing valuable data for long term climate monitoring.
    Keywords: Astrophysics
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Thermal control of the Lidar In-Space Technology Experiment (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Lidar In-Space Technology Experiment (LITE) will employ lidar techniques to study the atmosphere from space. The LITE instrument will be flown in the Space Shuttle Payload Bay with an earth directed orientation. The experiment thermal control incorporates both active and passive techniques. The Laser Transmitter Module (LTM) and the system electronics will be actively cooled through the Shuttle pallet coolant loop. The receiver system and experiment platform will be passsively controlled through the use of insulation and component surface properties. This paper explains the thermal control techniques used and the analysis results, with primary focus on the receiver system.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: SAE PAPER 871443
    Format: text
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    NASA TECHNICAL REPORTS
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