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  • Other Sources  (47)
  • FLUID MECHANICS AND HEAT TRANSFER  (29)
  • INSTRUMENTATION AND PHOTOGRAPHY  (18)
  • 1
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    Improvements in Ross type astrometric objectives (1971)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: It is shown that aspheric deformations of the first and fourth elements of the four element Ross objective can be introduced to permit one to obtain improved color corrections for astrometric purposes. The usual monochromatic aberrations are as well corrected as for the standard Ross lens. In addition, one can eliminate or reduce additional aberrations, such as secondary spectrum, chromatic spherical aberration, chromatic coma and chromatic distortion. The resulting objectives are suitable for use as intermediate and long focus astrometric objectives covering large angle fields.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Univ. of South Fla. Conf. on Phot. Astrometric Technique; p 61-84
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  • 2
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    'Oxide-free' tip for scanning tunneling microscopy (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A new tip for scanning tunneling microscopy and a tip repair procedure that allows one to reproducibly obtain atomic images of highly oriented pyrolytic graphite with previously inoperable tips are reported. The tips are shown to be relatively oxide-free and highly resistant to oxidation. The tips are fabricated with graphite by two distinct methods.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Physics Letters (ISSN 0003-6951); 51; 305-307
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  • 3
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    Microwave measurement of the electron density profile in a supersonic arc jet (1970)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: Microwave probe for measuring electron density profile in supersonic arc jet plasma
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ; 17 (
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  • 4
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    Prospects and expectations for unstructured methods (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The last decade has witnessed a vigorous and sustained research effort on unstructured methods for computational fluid dynamics. Unstructured mesh generators and flow solvers have evolved to the point where they are now in use for design purposes throughout the aerospace industry. In this paper we survey the various mesh types, structured as well as unstructured, and examine their relative strengths and weaknesses. We argue that unstructured methodology does offer the best prospect for the next generation of computational fluid dynamics algorithms.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Lewis Research Center, Surface Modeling, Grid Generation, and Related Issues in Computational Fluid Dynamic (CFD) Solutions; p 273-287
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  • 5
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    A highly efficient engineering tool for three-dimensional scramjet flowfield and heat transfer computations (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The SIMPLE-based parabolic flow code, SHIP3D, was under development for use as a parametric design and analysis tool for scramjets. Some capabilities and applications of the code are demonstrated, and a report on its current status is given. The focus is on the combustor for which the code was mostly used. Recently, it was also applied to nozzle flows. Code validation results are presented for combustor unit problems involving film cooling, transverse fuel injection, and nozzle test. A parametric study of a film cooled or transpiration cooled Mach 16 combustor is also conducted to illustrate the application of the code to a design problem.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA, Lewis Research Center, Computational Fluid Dynamics Symposium on Aeropropulsion; p 669-681
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  • 6
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    On current aspects of finite element computational fluid mechanics for turbulent flows (1982)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A set of nonlinear partial differential equations suitable for the description of a class of turbulent three-dimensional flow fields in select geometries is identified. On the basis of the concept of enforcing a penalty constraint to ensure accurate accounting of ordering effects, a finite element numerical solution algorithm is established for the equation set and the theoretical aspects of accuracy, convergence and stability are identified and quantized. Hypermatrix constructions are used to formulate the reduction of the computational aspects of the theory to practice. The robustness of the algorithm, and the computer program embodiment, have been verified for pertinent flow configurations.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 7
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    Aspects of a penalty finite element algorithm for the turbulent three-dimensional parabolic Navier-Stokes equations (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The formal derivation of the three-dimensional parabolic Navier-Stokes equations for subsonic turbulent flow is reviewed. A penalty finite element algorithm is established for numerical solution of the sixteen dependent variable system. Key numerical results are summarized documenting applications in various problem definitions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 8
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    Finite element computational fluid mechanics (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Finite element analysis as applied to the broad spectrum of computational fluid mechanics is analyzed. The finite element solution methodology is derived, developed, and applied directly to the differential equation systems governing classes of problems in fluid mechanics. The heat conduction equation is used to reveal the essence and elegance of finite element theory, including higher order accuracy and convergence. The algorithm is extended to the pervasive nonlinearity of the Navier-Stokes equations. A specific fluid mechanics problem class is analyzed with an even mix of theory and applications, including turbulence closure and the solution of turbulent flows.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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  • 9
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    Mathematical models for film sensitivity measurements (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The quality of the pictorial record developed from photographic material depends on the composition of the material, the procedures used in its exposure and processing, as well as, the nature of the physical and temporal environment extant during the creation of the record. By holding many of the variables fixed, the effect of the two environmental parameters, namely temperature and aging are examined on the characteristic curve of a given film. Polynomial and exponential functions are evaluated as empirical formulas for the characteristic curve, and the sensitivity of derived coefficients to the selected parameters is assessed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Alabama A & M Univ., NASA-HBCU Space Science and Engineering Research Forum Proceedings; p 69-76
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  • 10
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    Analysis of boundary conditions for SSME subsonic internal viscous flow analysis (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A study was completed of mathematically proper boundary conditions for unique numerical solution of internal, viscous, subsonic flows in the space shuttle main engine. The study has concentrated on well posed considerations, with emphasis on computational efficiency and numerically stable boundary condition statements. The method of implementing the established boundary conditions is applicable to a wide variety of finite difference and finite element codes, as demonstrated.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-178950 , NAS 1.26:178950 , COMCO-TR-87-4.0
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