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  • 1
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    Geometry Laboratory (GEOLAB) surface modeling and grid generation technology and services (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The facilities and services of the GEOmetry LABoratory (GEOLAB) at the NASA Langley Research Center are described. Included in this description are the laboratory functions, the surface modeling and grid generation technologies used in the laboratory, and examples of the tasks performed in the laboratory.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Lewis Research Center, Surface Modeling, Grid Generation, and Related Issues in Computational Fluid Dynamic (CFD) Solutions; p 69-86
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Grid generation on and about a cranked-wing fighter aircraft configuration (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Experiences at the NASA Langley Research Center generating grids about a cranked wing fighter aircraft configuration is described. A single block planar grid about the fuselage and canard used with a finite difference Navier-Stokes solver is also described. A dual block nonplanar grid about the complete configuration and used with a finite volume Euler solver is presented. The very important aspect of computing the aircraft surface grid, starting with a standardized model description, is also presented.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AGARD, Three Dimensional Grid Generation for Complex Configuration: Recent Progress; p 56-64
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Geometric requirements for multidisciplinary analysis of aerospace-vehicle design (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The geometric requirements for creating surfaces and grids for multidisciplinary analysis and optimization of aerospace-vehicle designs are described. Geometric surface representations are outlined and compared. Directions for future designs are proposed. High-speed civil transport aircraft configurations are targeted to demonstrate the processes.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 92-4773 , In: AIAA(USAF)NASA/OAI Symposium on Multidisciplinary Analysis and Optimization, 4th, Cleveland, OH, Sept. 21-23, 1992, Technical Papers. Pt. 2 (A93-20301 06-66); p. 686-694.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Adaptively resizing populations: Algorithm, analysis, and first results (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Deciding on an appropriate population size for a given Genetic Algorithm (GA) application can often be critical to the algorithm's success. Too small, and the GA can fall victim to sampling error, affecting the efficacy of its search. Too large, and the GA wastes computational resources. Although advice exists for sizing GA populations, much of this advice involves theoretical aspects that are not accessible to the novice user. An algorithm for adaptively resizing GA populations is suggested. This algorithm is based on recent theoretical developments that relate population size to schema fitness variance. The suggested algorithm is developed theoretically, and simulated with expected value equations. The algorithm is then tested on a problem where population sizing can mislead the GA. The work presented suggests that the population sizing algorithm may be a viable way to eliminate the population sizing decision from the application of GA's.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CR-194277 , NAS 1.26:194277
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Software Surface Modeling and Grid Generation Steering Committee (1992)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: It is a NASA objective to promote improvements in the capability and efficiency of computational fluid dynamics. Grid generation, the creation of a discrete representation of the solution domain, is an essential part of computational fluid dynamics. However, grid generation about complex boundaries requires sophisticated surface-model descriptions of the boundaries. The surface modeling and the associated computation of surface grids consume an extremely large percentage of the total time required for volume grid generation. Efficient and user friendly software systems for surface modeling and grid generation are critical for computational fluid dynamics to reach its potential. The papers presented here represent the state-of-the-art in software systems for surface modeling and grid generation. Several papers describe improved techniques for grid generation.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA-CP-3143 , L-17093 , NAS 1.55:3143 , Apr 28, 1992 - Apr 30, 1992; Hampton, VA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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