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  • AERODYNAMICS  (9)
  • Astrophysics
  • EARTH RESOURCES AND REMOTE SENSING
  • 1985-1989  (11)
  • 1
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    Developments and trends in three-dimensional mesh generation (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An intense research effort over the last few years has produced several competing and apparently diverse methods for generating meshes. Recent progress is reviewed and the central themes are emphasized which form a solid foundation for future developments in mesh generation.
    Keywords: AERODYNAMICS
    Type: NASA, Langley Research Center, Transonic Symposium: Theory, Application, and Experiment, Volume 1, Part 1; p 341-376
    Format: application/pdf
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  • 2
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    The Use of Thematic Mapper Data for Land Cover Discrimination: Preliminary Results from the UK Satmap Programme (1985)
    In:  CASI
    Details
    Publication Date: 2014-09-17
    Description: The principal objectives of the UK SATMaP program are to determine thematic mapper (TM) performance with particular reference to spatial resolution properties and geometric characteristics of the data. So far, analysis is restricted to images from the U.S. and concentrates on spectra and radiometric properties. The results indicate that the data are inherently three dimensional compared with the two dimensional character of MSS data. Preliminary classification results indicate the importance of the near infrared band (TM 4), at least one middle infrared band (TM 5 or TM 6) and at least one of the visible bands (preferably either TM 3 or TM 1). The thermal infrared also appears to have discriminatory ability despite its coarser spatial resolution. For band 4 the forward and reverse scans show somewhat different spectral responses in one scene but this effect is absent in the other analyzed. From examination of the histograms it would appear that the full 8 bit quantization is not being effectively utilized for all the bands.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center LANDSAT-4 Sci. Characterization Early Results, Vol. 4; p 369-386
    Format: text
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  • 3
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    A procedure based on the Euler equations for correcting transonic wind tunnel wall interference (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Based on an optimization formulation, a procedure has been developed to evaluate Mach number and angle-of-attack corrections. The Euler equations are assumed to be the flow governing equations. To obtain efficient solutions for the optimization problem, the iterative solutions for the flow variables and the design parameters are simultaneously updated. In addition to the model lift and geometry, the procedure requires pressure measurements near the tunnel walls. The accuracy and efficiency of several optimization techniques are investigated. The effect of perturbing certain test conditions on the residual interference is investigated.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 88-0141
    Format: text
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  • 4
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    Three-dimensional nearfield characterization of a VSTOL jet in turbulent crossflow (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper documents the measurement and prediction of the near-field evolution of the steady, subsonic, turbulent three-dimensional external aerodynamic flow-field associated with a high speed jet issued from an orifice perpendicular to an imposed crossflow velocity field. A parabolic Navier-Stokes CFD solver is employed, utilizing a Kappa-epsilon closure system with algebraic Reynolds stress equation, in concert with suitably defined porous far-field boundary conditions and a virtual source initial condition procedure. The CFD results correlate well with NASA generated near-field LDA experimental data on mean velocity and rms fluctuation velocity (interpolated to turbulent kinetic energy) distributions. The numerical results in the farther field predict the vortex roll-up and jet deflection/entrainment characterization verified by pitot-static mean velocity experimental data. Detailed results are presented for a circular jet for velocity ratios ranging 4 to 8.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-0051
    Format: text
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  • 5
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    An implicit and stiffly stable finite element CFD algorithm for unsteady aerodynamics (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A stable and accurate finite element CFD algorithm for hyperbolic/incompletely parabolic conservation law systems is described and verified. It combines a Taylor weak statement FEM, an optimal implicit Runge-Kutta time integration algorithm, and a matrix tensor product approximate factorization linear algebra procedure. The results of computational experiments show that the developed algorithm is robust.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-0656
    Format: text
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  • 6
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    Progress on a Taylor weak statement finite element algorithm for high-speed aerodynamic flows (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new finite element numerical Computational Fluid Dynamics (CFD) algorithm has matured to the point of efficiently solving two-dimensional high speed real-gas compressible flow problems in generalized coordinates on modern vector computer systems. The algorithm employs a Taylor Weak Statement classical Galerkin formulation, a variably implicit Newton iteration, and a tensor matrix product factorization of the linear algebra Jacobian under a generalized coordinate transformation. Allowing for a general two-dimensional conservation law system, the algorithm has been exercised on the Euler and laminar forms of the Navier-Stokes equations. Real-gas fluid properties are admitted, and numerical results verify solution accuracy, efficiency, and stability over a range of test problem parameters.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-0654
    Format: text
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  • 7
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    Identification and spectral characteristics of hydrothermal alteration on Landsat TM imagery of north Chile (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This study examines the application of Landsat TM data to the identification of hydrothermal alteration in the arid terrain of the El Salvador region of north Chile. Numerical reflectance values were extracted from the digital Landsat TM data for a variety of rock surfaces, including four parts of the El Salvador gossan, for each of six spectral bands. These reflectance values were analyzed statistically in order to select the three spectral bands, combined as a color composite image, that are most efficient in discriminating different varieties of alteration and for general geological interpretation. The most cost effective composite image for this area is a combination of bands 1, 4 and 7 as the blue, green and red components respectively, with simple contrast enhancement. This image is superior to some much more expensive enhancement techniques and allows unambiguous identification of areas of hydrothermal alteration larger than about 50 m. The display includes a practical guide to the use of Landsat TM imagery for volcanic gold exploration.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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  • 8
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    Improvements to the aircraft Euler method (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An unstructured mesh of tetrahedra offers an attractive approach to mesh generation for complex three dimensional shapes. The combination of a method for constructing tetrahedral meshes and a finite element technique for solving the Euler equations has resulted in a powerful new approach to the problem of calculating flows over complex geometries. Recent progress and improvements to the authors' aircraft Euler method are described and results presented to demonstrate its capability.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 87-0452
    Format: text
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  • 9
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    Euler procedure for correcting two-dimensional transonic wind-tunnel wall interference (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 26; 1457-146
    Format: text
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  • 10
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    Euler procedure for three-dimensional transonic wall interference (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Based on an optimization formulation, a procedure has been developed to evaluate Mach number and angle-of-attack corrections. The Euler equations are assumed to be the flow governing equations. To obtain efficient solutions for the optimization problem, the iterative solutions for the flow variables and the design parameters are simultaneously updated. In addition to the model lift and geometry, the procedure requires pressure measurements near the tunnel walls. The tunnel boundary conditions are based on the introduction of Reimann invariants for a one-dimensional flow normal to the boundary. Computations are performed to verify that the errors introduced by this approximate boundary-condition formulation are acceptably small. The correction scheme is applied to an aircraft configuration in an open jet. The results indicate that the optimization scheme is highly efficient with the rate of convergence of the flow solution nearly equal to the corresponding rate of a regular analysis problem.
    Keywords: AERODYNAMICS
    Type: Journal of Aircraft (ISSN 0021-8669); 26; 48-55
    Format: text
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