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  • AERODYNAMICS
  • GEOPHYSICS
  • 1925-1929  (2)
  • 1
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    Lattice arrangements for rapid convergence (1926)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A simple, systematic, optimized vortex-lattice approach is developed for application to lifting-surface problems. It affords a significant reduction in computational costs when compared to current methods. Extensive numerical experiments have been carried out on a wide variety of configurations, including wings with camber and single or multiple flaps, as well as high-lift jetflap systems. Rapid convergence as the number of spanwise or chordwise lattices are increased is assured, along with accurate answers. The results from this model should be useful not only in preliminary aircraft design but also, for example, as input for wake vortex roll-up studies and transonic flow calculations.
    Keywords: AERODYNAMICS
    Type: NASA. Langley Res. Center Vortex-Lattice Utilization; p 325-342
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Gyroresonant pitch angle scattering by coherent and incoherent whistler mode waves in the magnetosphere (1928)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The magnitudes of gyroresonant pitch angle scattering in the magnetosphere due to interactions of energetic electrons with coherent and with incoherent whistler-mode waves are compared, using a test particle method for simulating the interaction of a particle population with a finite duration wave packet. Wave packets of 400 ms duration propagating along the magnetic field at L = 4 within the plasmasphere are considered, and the wave-induced pitch angle scattering along the propagation path from one hemisphere to the other and the resulting precipitation flux are computed. Results of the test particle analysis are compared with those expected on the basis of a classical diffusion treatment, and an expression is derived for an effective 'diffusion' coefficient for pitch angle scattering by coherent waves.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; 127-142
    Format: text
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    NASA TECHNICAL REPORTS
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