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  • 1
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    The NASA-IGES geometry data exchange standard (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described here are the data exchange efforts and plans supported by the NASA Steering Committee for Surface Modeling and Grid Generation. Current methods for geometry data exchange between computer aided design (CAD) systems and NASA computational fluid dynamics (CFD) analysis systems are tedious and induce errors. A Geometry Data Exchange Standard is proposed, utilizing a subset of an existing national standard titled Initial Graphic Exchange Standard (IGES). Future plans for data exchange standardization include all aspects of CFD data. Software systems to utilize this NASA-IGES Geometry Data Exchange Specification are under development.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Langley Research Center, Software Surface Modeling and Grid Generation Steering Committee; p 1-6
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    NASA geometry data exchange specification for computational fluid dynamics (NASA IGES) (1994)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document specifies a subset of an existing product data exchange specification that is widely used in industry and government. The existing document is called the Initial Graphics Exchange Specification. This document, a subset of IGES, is intended for engineers analyzing product performance using tools such as computational fluid dynamics (CFD) software. This document specifies how to define mathematically and exchange the geometric model of an object. The geometry is represented utilizing nonuniform rational B-splines (NURBS) curves and surfaces. Only surface models are represented; no solid model representation is included. This specification does not include most of the other types of product information available in IGES (e.g., no material properties or surface finish properties) and does not provide all the specific file format details of IGES. The data exchange protocol specified in this document is fully conforming to the American National Standard (ANSI) IGES 5.2.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-RP-1338 , A-93089 , NAS 1.61:1338
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The NASA-IGES geometry data visualizer (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: NIGESview, an interactive software tool for reading, viewing, and translating geometry data available in the Initial Graphics Exchange Specification (IGES) format, is described. NIGESview is designed to read a variety of IGES entities, translate some of the entities, graphically view the data, and output a file in a specific IGES format. The software provides a modern graphical user interface and is designed in a modular fashion so developers can utilize all or part of the code in their grid generation software for computational fluid dynamics.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NASA. Langley Research Center, Software Surface Modeling and Grid Generation Steering Committee; p 315-318
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A concurrent hybrid Navier-Stokes/Euler approach to fluid dynamic computations (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: We present a methodology for the numerical simulation of flow fields by the simultaneous application of two distinct approaches to computational aerodynamics. We compute the three dimensional flow field of a missile at moderate angle of attack by dividing the flow field into two regions: a region near the surface where we use a structured grid and a Navier Stokes solver, and a region farther away from the surface where we utilize an unstructured grid and an Euler solver. The two solvers execute as independent UNIX processes either on the same machine or on two machines. The solvers communicate data across their common interfaces within the same machine or over the network. The computations indicate that extensively separated flow fields can be computed without significant distortion by combining viscous and inviscid solvers.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 93-0789 , ; 8 p.|AIAA, Aerospace Sciences Meeting and Exhibit; Jan 11, 1993 - Jan 14, 1993; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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