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  • FLUID MECHANICS AND HEAT TRANSFER  (73)
  • AIRCRAFT
  • Aerodynamics
  • General Chemistry
  • 1985-1989  (103)
  • 1955-1959
  • 1987  (103)
  • 1
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    Numerical and analytical study of fluid dynamic forces in seals and bearings (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A numerical model based on a transformed, conservative form of the three dimensional Navier-Stokes equation and an analytical model based on lumped fluid parameters are presented and compared with studies of modeled rotor bearing seal systems. The rotor destabilizing factors are related to the rotative character of the flow field. It is shown that these destabilizing factors can be reduced through a decrease in the fluid average circumferential velocity. However, the rotative character of the flow field is a complex three dimensional system with bifurcated secondary flow patterns that significantly alter the fluid circumferential velocity. By transforming the Navier-Stokes equations to those for a rotating observer and using the numerical code PHOENICS-84 with a nonorthogonal body fitted grid, several numerical experiments were carried out to demonstrate the character of this complex flow field. In general, fluid injection and/or preswirl of the flow field opposing the shaft rotation significantly intensified these secondary recirculation zones and thus reduced the average circumferential velocity; injection or preswirl in the direction of rotation significantly weakened these zones.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-100268 , E-3903 , NAS 1.15:100268
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High-speed code validation (1987)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: The topics are presented in viewgraph form and include the following: NFL body experiment; high-speed validation problems; 3-D Euler/Navier-Stokes inlet code; two-strut inlet configuration; pressure contours in two longitudinal planes; sidewall pressure distribution; pressure distribution on strut inner surface; inlet/forebody tests in 60 inch helium tunnel; pressure distributions on elliptical missile; code validations; small scale test apparatus; CARS nonintrusive measurements; optimized cone-derived waverider study; etc.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA. Ames Research Center, NASA CFD Validation Workshop; p 210-243
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Finite difference solution for a generalized Reynolds equation with homogeneous two-phase flow (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An attempt is made to relate elements of two-phase flow and kinetic theory to the modified generalized Reynolds equation and to the energy equation, in order to arrive at a unified model simulating the pressure and flows in journal bearings, hydrostatic journal bearings, or squeeze film dampers when a two-phase situation occurs due to sudden fluid depressurization and heat generation. The numerical examples presented furnish a test of the algorithm for constant properties, and give insight into the effect of the shaft fluid heat transfer coefficient on the temperature profiles. The different level of pressures achievable for a given angular velocity depends on whether the bearing is thermal or nonisothermal; upwind differencing is noted to be essential for the derivation of a realistic profile.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An implicit flux-split algorithm for the compressible Navier-Stokes equations (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An implicit upwind scheme for the compressible Navier-Stokes equations is described and applied to the internal flow in a dual-throat nozzle. The method is second-order accurate spatially and naturally dissipative. A spatially-split approximate factorization method is used to obtain efficient steady-state solutions on the NASA Langley VPS-32 (CYBER 205) supercomputer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of seals for high-performance cryogenic turbomachines (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An approach to computing flow and dynamic characteristics for seals or bearings is discussed. The local average velocity was strongly influenced by inlet and exit effects and fluid injection, which in turn drove zones of secondary flow. For the restricted three-dimensional model considered, the integral averaged results were in reasonable agreement with selected data. Unidirectional pressure measurements alone were insufficient to define such flow variations. However, for seal and bearing leakage correlations the principles of corresponding states were found to be useful. Also discussed are three phenomena encountered during testing of three eccentric nonrotating seal configurations for the Space Shuttle Main Engine (SSME) Program. Fluid injection, choking within a seal, and pressure profile crossover are related to postulated zones of secondary flow or separation and to direct stiffness.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-88919 , E-3348 , NAS 1.15:88919
    Format: application/pdf
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  • 6
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    Analysis of viscous transonic flow over airfoil sections (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A full Navier-Stokes solver has been used to model transonic flow over three airfoil sections. The method uses a two-dimensional, implicit, conservative finite difference scheme for solving the compressible Navier-Stokes equations. Results are presented as prescribed for the Viscous Transonic Airfoil Workshop to be held at the AIAA 25th Aerospace Sciences Meeting. The NACA 0012, RAE 2822 and Jones airfoils have been investigated for both attached and separated transonic flows. Predictions for pressure distributions, loads, skin friction coefficients, boundary layer displacement thickness and velocity profiles are included and compared with experimental data when possible. Overall, the results are in good agreement with experimental data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-88912 , E-3340 , NAS 1.15:88912 , AIAA PAPER 87-0420
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Cartan and relativistic spin fluids in a rotating cylinder (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-101777 , NAS 1.15:101777 , UM-NP-JK-87-1
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The effect of eddy distribution on momentum and heat transfer near the wall in turbulent pipe flow (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A study was conducted to determine the effect of eddy distribution on momentum and heat transfer near the wall in turbulent pipe flow. The buffer zone was of particular interest in that it is perhaps the most complicated and least understood region in the turbulent flow field. Six eddy diffusivity relationships are directly compared on their ability to predict mean velocity and temperature distributions in turbulent air flow through a cylindrical, smooth-walled pipe with uniform heat transfer. Turbulent flow theory and the development of the eddy diffusivity relationships are briefly reviewed. Velocity and temperature distributions derived from the eddy diffusivity relationships are compared to experimental data for fully-developed pipe flow in turbulent air at a Prandtl number of 0.73 and Reynolds numbers ranging from 8100 to 25 000.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-100257 , E-3882 , NAS 1.15:100257
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Computation of unsteady separation using Lagrangian procedures (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The interaction between increased knowledge of unsteady separation processes and computational techniques is examined, emphasizing the use of Lagrangian coordinates. Examples include boundary layer solutions of two-dimensional unsteady flows, and separation from rotating and translating spheres. Advances in Lagrangian techniques for the Navier-Stokes equations are illusrated by means of high resolution random-walk computations of the impulsively started circular cylinder.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Boundary-layer separation; Aug 26, 1986 - Aug 28, 1986; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
    Electronic Resource
    Electronic Resource
    Alkylaluminium-Kationen: Synthese und Struktur von Diese Arbeit wurde vom Australian Research Grants Scheme gefördert. (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 99 (1987), S. 702-703 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19870990724
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    Paper (German National Licenses)
    Fulltext
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