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  • FLUID MECHANICS  (50)
  • 1995-1999
  • 1980-1984
  • 1970-1974  (50)
  • 1973  (50)
  • 1
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    Calculation of transitional boundary-layer flows. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The results of a finite-difference calculation of hypersonic transitional boundary-layer flow are presented. Precursor-transition and low Reynolds number turbulence effects are included. These calculation results are compared with data from a source where profiles are available at the beginning, middle and end of the hypersonic transitional flow. The results indicate that the low Reynolds number effect is the most important.
    Keywords: FLUID MECHANICS
    Type: AIAA Journal; 11; Apr. 197
    Format: text
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  • 2
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    A local eddy viscosity model for turbulent shear flow (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: In the model described, the eddy viscosity is assumed to be a fluid property dependent on the state of the fluid locally, namely the local density, turbulent kinetic energy, turbulence scale, and Mach number. An empirical law was found which related eddy viscosity to these properties satisfactorily for free jets. This law is used without modification for a set of test cases in free shear layers, free-jet decay, coaxial mixing, and wakes. The scale of turbulence is taken as a constant at any axial location equal to the width of the shear layer. By utilizing the boundary-layer order-of-magnitude analysis, a coupled set of fluid dynamic equations is formulated, which of necessity includes the equation for the production of turbulent kinetic energy.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley Res. Center Free Turbulent Shear Flows, Vol. 1; p 529-547
    Format: application/pdf
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  • 3
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    A rational approach to the use of Prandtl's mixing length model in free turbulent shear flow calculations (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Prandtl's basic mixing length model was used to compute 22 test cases on free turbulent shear flows. The calculations employed appropriate algebraic length scale equations and single values of mixing length constant for planar and axisymmetric flows, respectively. Good agreement with data was obtained except for flows, such as supersonic free shear layers, where large sustained sensitivity changes occur. The inability to predict the more gradual mixing in these flows is tentatively ascribed to the presence of a significant turbulence-induced transverse static pressure gradient which is neglected in conventional solution procedures. Some type of an equation for length scale development was found to be necessary for successful computation of highly nonsimilar flow regions such as jet or wake development from thick wall flows.
    Keywords: FLUID MECHANICS
    Type: Free Turbulent Shear Flows, Vol. 1; p 67-137
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  • 4
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    Mixing of multiple dilution jets with a hot primary airstream for gas turbine combustors (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The mixing of multiple air jets with a subsonic heated crossflow in a constant area duct was studied experimentally. The jet-to-mainstream momentum flux ratio was varied from 6 to 60. Temperature and pressure surveys were made at several downstream locations for orifice geometries with parametric variation of orifice size and spacing. A mixing efficiency parameter was defined which characterized the effectiveness of the mixing over the range of conditions examined. It was found that for a given momentum flux ratio, there exists a ratio of orifice spacing to duct height which provides the best mixing.
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 73-1249 , Propulsion Conference; Nov 05, 1973 - Nov 07, 1973; Las Vegas, NV; US
    Format: text
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  • 5
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    Shock wave-turbulent boundary layer interactions in rectangular channels. II - The influence of sidewall boundary layers on incipient separation and scale of the interaction. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 73-234 , Aerospace Sciences Meeting; Jan 10, 1973 - Jan 12, 1973; Washington, DC
    Format: text
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  • 6
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    Introduction to boundary-layer theory (1973)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: The pressure ratio across a turbine provides a certain amount of ideal energy that is available to the turbine for producing work. The portion of the ideal energy that is not converted to work is considered to be a loss. One of the more important and difficult aspects of turbine design is the prediction of the losses. The primary cause of losses is the boundary layer that develops on the blade and end wall surfaces. Boundary-layer theory is used to calculate the parameters needed to estimate viscous (friction) losses.
    Keywords: FLUID MECHANICS
    Type: Turbine Design and Appl., Vol. 2; p 57-92
    Format: text
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  • 7
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    The analysis of nonequilibrium, chemically reacting, supersonic flow in three dimensions using a bicharacteristics method. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A second-order numerical method of characteristics based on a bicharacteristics scheme was developed for the evaluation of steady, supersonic, nonequilibrium, chemically reacting flows. The absolute accuracy and order of accuracy of the method was shown by comparisons with spherical source flow and axisymmetric, nonequilibrium flows. Numerical results were obtained for elliptical and super-elliptical nozzles. These results illustrate the complex nature of three-dimensional flows and the inadequacy of quasi-three-dimensional methods which neglect cross flows.
    Keywords: FLUID MECHANICS
    Type: Journal of Computational Physics; 12; May 1973
    Format: text
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  • 8
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    Ratio of Reynolds shear stress to turbulence kinetic energy in a boundary layer. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: FLUID MECHANICS
    Type: Physics of Fluids; 16; June 197
    Format: text
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  • 9
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    Calculation of turbulent free mixing: Status and problems (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: An overview of turbulence closure methods is presented along with discussions concerning which method works where and which approaches deserve further development. A table is given which lists the various computational techniques together with their prime usage areas. In addition, free mixing phenomena which were not specifically included in the basic data considered for the conference are summarized.
    Keywords: FLUID MECHANICS
    Type: Free Turbulent Shear Flows, Vol. 1; p 1-10
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  • 10
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    Prediction of free shear flows: A comparison of the performance of six turbulence models (1973)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The performance is evaluated of three distinct classes of turbulence model. These classes are: (1) Turbulent-viscosity models in which the length scale of turbulence is found by way of algebraic formulas, (2) turbulent-viscosity models in which the length scale of turbulence is found from a partial differential equation of transport, and (3) models in which the shear stress itself is the dependent variable of a partial differential conservation equation. Two models were examined in each class; thus, six different models were tested. A complete mathematical statement of these models is provided and a brief commentary on the models is included.
    Keywords: FLUID MECHANICS
    Type: NASA. Langley Res. Center Free Turbulent Shear Flows, Vol. 1; p 361-426
    Format: application/pdf
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