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  • Other Sources  (8)
  • 1985-1989  (8)
  • 1
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    On Boussinesq's problem for Maxwell continua subject to an external gravity field (1985)
    In:  Geophys. J. R. astr. Soc., Köln, Elsevier, vol. 80, no. 1, pp. 275-279, pp. B08301, (ISSN: 1340-4202)
    Details
    Publication Date: 1985
    Keywords: Inelastic ; Rheology ; Gravimetry, Gravitation ; Elasticity ; GJRaS
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Analysis of turbulent underexpanded jets. II - Shock noise features using SCIPVIS (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: SCIPVIS, the computational model discussed by Dash et al. (1985), is assessed in predicting the complicated flow structure associated with shock-containing plumes. In addition, the analysis in this study examines this code's applicability as a basic part of a program for estimating broadband shock noise radiation. The results of this study show that excellent agreement exists between predicted and measured static pressure distributions for both underexpanded and overexpanded flow cases considered. Of the three turbulence closure models incorporated in the SCIPVIS code, the kW model of Spalding produces the most uniform agreement with measurement. The k-epsilon-2 model of Launder consistently overestimates plume spreading for supersonic jets with exit Mach numbers in the 1-2 range. Dash's (1983) k-epsilon-2-cc, compressibility-corrected version of Launder's model underestimates plume spreading. Good qualitative agreement was also obtained between the measured longitudinal turbulence intensity and that predicted by the code for the same trial case. Comparison of measured and predicted broadband shock noise spectrum peak values were found to be in excellent agreement. This utilized a variant of the Harper-Bourne and Fisher (1973) phase-array model: the effective shock spacing was reinterpreted as the value of the end of the plume potential core, determined herein by the SCIPVIS code.
    Keywords: ACOUSTICS
    Type: AIAA Journal (ISSN 0001-1452); 23; 669-677
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Progress in the development of parabolized Navier-Stokes (PNS) methodology for analyzing propulsive jet mixing problems (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A brief review of 2D PNS methodology is first presented which describes the specialized features of supersonic shock-capturing and subsonic pressure-split models required for the analysis of aircraft, rocket and scramjet jet mixing problems. These features include techniques for dealing with various types of embedded and interfacing subsonic regions, the inclusion of finite-rate chemistry and the direct-coupling with potential flow solutions. Preliminary 3D extensions of this PNS methodology geared to supersonic and subsonic rectangular free jet mixing problems are also reviewed. New 3D PNS work will be described which includes the development of a hybrid supersonic/subsonic free jet mixing model, and, a supersonic model geared to the analysis of turbulent mixing and combustion processes occurring in scramjet combustor/nozzle flowfields.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1115
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Computational models for the analysis/design of hypersonic scramjet components. I - Combustor and nozzle models (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An overview of computational models developed for the complete, design-oriented analysis of a scramjet propulsion system is provided. The modular approach taken involves the use of different PNS models to analyze the individual propulsion system components. The external compression and internal inlet flowfields are analyzed by the SCRAMP and SCRINT components discussed in Part II of this paper. The combustor is analyzed by the SCORCH code which is based upon SPLITP PNS pressure-split methodology formulated by Dash and Sinha. The nozzle is analyzed by the SCHNOZ code which is based upon SCIPVIS PNS shock-capturing methodology formulated by Dash and Wolf. The current status of these models, previous developments leading to this status, and, progress towards future hybrid and 3D versions are discussed in this paper.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 86-1595
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Flexible Heat Pipe (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Narrow Tube carries 10 watts or more to moving parts. Heat pipe 12 inches long and diameter of 0.312 inch (7.92mm). Bent to minimum radius of 2.5 blocks. Flexible section made of 321 stainless steel tubing (Cajon Flexible Tubing or equivalent). Evaporator and condenser made of oxygen free copper. Working fluid methanol.
    Keywords: MECHANICS
    Type: GSC-12864 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 376
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Analysis of turbulent underexpanded jets. I - Parabolized Navier-Stokes model, SCIPVIS (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new computational model (SCIPVIS) is described which predicts the multiple-cell wave/shock structure in underexpanded or overexpanded turbulent jets. SCIPVIS solves the parabolized Navier-Stokes jet-mixing equations utilizing a shock-capturing approach in supersonic regions of the jet and a pressure-split approach in subsonic regions. Turbulence processes are represented by the solution of compressibility-corrected two-equation turbulence models. SCIPVIS presently analyzes jets exhausting into a quiescent or supersonic external stream for which a single-pass spatial-marching solution can be obtained. The features of SCIPVIS are reviewed, and calculations are described exhibiting the influence of turbulence modelling, jet temperature, and flight velocity on the jet shock structure.
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 23; 505-514
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Fully-coupled analysis of jet mixing problems. Three-dimensional PNS model, SCIP3D (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Numerical procedures formulated for the analysis of 3D jet mixing problems, as incorporated in the computer model, SCIP3D, are described. The overall methodology closely parallels that developed in the earlier 2D axisymmetric jet mixing model, SCIPVIS. SCIP3D integrates the 3D parabolized Navier-Stokes (PNS) jet mixing equations, cast in mapped cartesian or cylindrical coordinates, employing the explicit MacCormack Algorithm. A pressure split variant of this algorithm is employed in subsonic regions with a sublayer approximation utilized for treating the streamwise pressure component. SCIP3D contains both the ks and kW turbulence models, and employs a two component mixture approach to treat jet exhausts of arbitrary composition. Specialized grid procedures are used to adjust the grid growth in accordance with the growth of the jet, including a hybrid cartesian/cylindrical grid procedure for rectangular jets which moves the hybrid coordinate origin towards the flow origin as the jet transitions from a rectangular to circular shape. Numerous calculations are presented for rectangular mixing problems, as well as for a variety of basic unit problems exhibiting overall capabilities of SCIP3D.
    Keywords: AERODYNAMICS
    Type: NASA-CR-4139 , NAS 1.26:4139 , SAIC/PR-TR-67
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Parabolized Navier-Stokes analysis of three-dimensional supersonic and subsonic jet mixing problems (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 1252
    Format: text
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    NASA TECHNICAL REPORTS
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