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  • FLUID MECHANICS AND HEAT TRANSFER  (28)
  • 1980-1984  (21)
  • 1975-1979  (7)
  • 1
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    Turbulence modeling methods for the compressible Navier-Stokes equations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Turbulence modeling methods for the compressible Navier-Stokes equations, including several zero- and two-equation eddy-viscosity models, are described and applied. Advantages and disadvantages of the models are discussed with respect to mathematical simplicity, conformity with physical theory, and numerical compatibility with methods. A new two-equation model is introduced which shows advantages over other two-equation models with regard to numerical compatibility and the ability to predict low-Reynolds-number transitional phenomena. Calculations of various transonic airfoil flows are compared with experimental results. A new implicit upwind-differencing method is used which enhances numerical stability and accuracy, and leads to rapidly convergent steady-state solutions.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 83-1693
    Format: text
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  • 2
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    Solution of the Navier-Stokes equations for flow within a 2-D thrust reversing nozzle (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Implicit numerical procedures have been developed to solve the Reynold's Averaged Navier-Stokes equations for the flowfield within a two-dimensional thrust reversing engine nozzle. The procedures have been tested on four different thrust reverser nozzle geometries with both fixed and moving walls. The results have compared well with available experimental data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 84-0344
    Format: text
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  • 3
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    Shock wave properties of anorthosite and gabbro (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Hugoniot data on San Gabriel anorthosite and San Marcos gabbro to 11 GPA are presented. Release paths in the stress-density plane and sound velocities are reported as determined from particl velocity data. Electrical interference effects precluded the determination of accurate release paths for the gabbro. Because of the loss of shear strength in the shocked state, the plastic behavior exhibited by anorthosite indicates that calculations of energy partitioning due to impact onto planetary surfaces based on elastic-plastic models may underestimate the amount of internal energy deposited in the impacted surface material.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-173309 , NAS 1.26:173309
    Format: application/pdf
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  • 4
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    A compressible Navier-Stokes code for turbulent flow modeling (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An implicit, finite volume code for solving two dimensional, compressible turbulent flows is described. Second order upwind differencing of the inviscid terms of the equations is used to enhance stability and accuracy. A diagonal form of the implicit algorithm is used to improve efficiency. Several zero and two equation turbulence models are incorporated to study their impact on overall flow modeling accuracy. Applications to external and internal flows are discussed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-85899 , A-9669 , NAS 1.15:85899
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  • 5
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    Finite element methods for first-order hyperbolic systems with particular emphasis on the compressible Euler equations (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A Petrov-Galerkin finite element formulation is presented for first-order hyperbolic systems of conservation laws with particular emphasis on the compressible Euler equations. Applications of the methodology are made to one- and two-dimensional steady and unsteady flows with shocks. Results obtained suggest the potential of the type of methods developed.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computer Methods in Applied Mechanics and Engineering (ISSN 0045-7825); 45; 218-284
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  • 6
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    Physical phenomena in containerless glass processing (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Experiments were conducted on bubble migration in rotating liquid bodies contained in a sphere. Experiments were initiated on the migration of a drop in a slightly less dense continuous phase contained in a rotating sphere. A refined apparatus for the study of thermocapillar flow in a glass melt was built, and data were acquired on surface velocities in the melt. Similar data also were obtained from an ambient temperature fluid model. The data were analyzed and correlated with the aid of theory. Data were obtained on flow velocities in a pendant drop heated from above. The motion in this system was driven principally by thermocapillarity. An apparatus was designed for the study of volatilization from a glass melt.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-162007 , NAS 1.26:162007
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  • 7
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    Implicit upwind methods for the compressible Navier-Stokes equations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A class of implicit upwind-differencing methods for the compressible Navier-Stokes equations is described and applied. The methods are based on the use of local eigenvalues or wave speeds to control spatial differencing of inviscid terms and are aimed at increasing the level of accuracy and stability achievable in computation. Techniques for accelerating the rate of convergence to a steady-state solution are also used. Applications to inviscid and viscous transonic flows are discussed and compared with other methods and experimental measurements. It is shown that accurate and efficient transonic airfoil calculations can be made on the Cray-1 coomputer in less than 2 min.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 83-1958 , Computational Fluid Dynamics Conference; Jul 13, 1983 - Jul 15, 1983; Danvers, MA
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  • 8
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    Numerical investigation of turbulence models for shock separated boundary-layer flows (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Numerical solutions of the Navier-Stokes equations for shock separated turbulent boundary-layer flows are presented. Several turbulence models are investigated and assessed by their ability to predict the physical phenomena associated with two extensively documented experiments. The experimental flows consist of shock-wave boundary-layer interactions in axisymmetric internal and external geometries at Mach numbers of 1.5 and 7, respectively. Algebraic and one-equation eddy viscosity models are used to describe the Reynolds shear stress. Calculated values of skin friction, wall pressure distribution, kinetic energy of turbulence, and heat transfer are compared with measurements.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 77-44 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
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  • 9
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    Turbulent-flow separation criteria for overexpanded supersonic nozzles (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A comprehensive compilation of available turbulent flow separation data for overexpanded supersonic nozzles is presented with a discussion of correlation techniques, and prediction methods. Data are grouped by nozzle types: conical, contoured, and two dimensional wedge. Correlation of conical nozzle separation is found to be independent of nozzle divergence half-angle above the 9 deg, whereas the contoured nozzle data follow a different correlation curve. Zero pressure gradient prediction techniques are shown to predict adequately the higher divergence angle conical separation data, and an empirical equation is given for the contoured nozzle data correlation. Flow conditions for which the correlations are invalid are discussed and bounded. A nozzle boundary layer transition criterion is presented which can be used to show that much of the noncorrelating data in the literature are concerned with nonturbulent separation and which explains the previously reported external flow effects on nozzle separation.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TP-1207 , L-11530
    Format: application/pdf
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  • 10
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    Element-by-element factorization algorithms for heat conduction (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Element-by-element solution strategies are developed for transient heat conduction problems. Results of numerical tests indicate the effectiveness of the procedures proposed. The small database requirements and attractive architectural features of the algorithms suggest considerable potential for solving large scale problems.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-173034 , NAS 1.26:173034
    Format: application/pdf
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