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  • 1
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    Streamwise computation of three-dimensional parabolic flows (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A new approach to calculate three-dimensional parabolic flows is presented. The flow field is computed by calculating velocity along a set of streamlines. The dependent variables commonly used in the computation of three-dimensional flows are the three velocity components. In contrast, the dependent variables in the present approach are the streamwise velocity and the two coordinates, in the cross-stream plane, of the chosen streamlines. The streamwise velocity is calculated from the finite difference equations obtained by applying Euler's momentum theorem to streamtubes constructed around the chosen streamlines; the streamline coordinates are calculated from the conservation of mass. Results of the calculations, based on the present approach, are compared with the experimental data for flow through rectangular ducts; the agreement is satisfactory.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computer Methods in Applied Mechanics and Engineering (ISSN 0045-7825); 36; 71-93
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  • 2
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    Performance prediction of straight two dimensional diffusers (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A method, based on full viscous calculations, is presented to predict performance of straight two dimensional diffusers. The method predicts adequately the experimental pressure recovery data, up to the point of maximum pressure recovery, for small and large inlet boundary layer thicknesses. It is shown that at the point of maximum pressure recovery the streamwise velocity in the very near wall region varies as Z to the 0.22 power, where Z is the distance from the diffuser wall.
    Keywords: PLASMA PHYSICS
    Type: NASA-CR-165186 , DOE/NASA/3186-1 , ME-MG80-1
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  • 3
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    Streamwise computation of duct flows (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A computational method is presented to calculate momentum and energy transport in two-dimensional viscous compressible duct flows. The flow in the duct is partitioned into finite streams. The difference equations are then obtained by applying momentum and energy conservation principles directly to the individual streams. The method is applicable to laminar and turbulence flows.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Computer Methods in Applied Mechanics and Engineering; 21; Feb. 198
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  • 4
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    Numerical modeling of two-dimensional confined flows (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A numerical model of two-dimensional confined flows is presented. The flow in the duct is partitioned into finite streams. The difference equations are then obtained by applying conservation principles directly to the individual streams. A listing of a computer code based on this approach in FORTRAN 4 language is presented. The code computes two dimensional compressible turbulent flows in ducts when the duct area along the flow is specified and the pressure gradient is unknown.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-162115 , ME-MG79-1
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  • 5
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    Numerical Modeling of Three-Dimensional Confined Flows (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A three dimensional confined flow model is presented. The flow field is computed by calculating velocity and enthalpy along a set of streamlines. The finite difference equations are obtained by applying conservation principles to streamtubes constructed around the chosen streamlines. With appropriate substitutions for the body force terms, the approach computes three dimensional magnetohydrodynamic channel flows. A listing of a computer code, based on this approach is presented in FORTRAN IV language. The code computes three dimensional compressible viscous flow through a rectangular duct, with the duct cross section specified along the axis.
    Keywords: PLASMA PHYSICS
    Type: NASA-CR-165583 , NAS 1.26:165583
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  • 6
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    The effect of velocity overshoot on the performance of magnetohydrodynamic subsonic diffusers (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The effect of velocity overshoot, a velocity distribution encountered in magnetohydrodynamic channels with peak velocity near the wall instead of at the center, on the performance of two-dimensional subsonic diffusers was investigated. For the simplified conditions analyzed in this paper it was found that the ratio of peak-to-centerline velocity increases along the diffuser for a diffuser half angle greater than some critical value. It was also found that irrespective of the accompanying inlet temperature distribution the wall shear stress and the wall heat flux is substantially larger when the inlet velocity profile has an overshoot than that for a fully developed turbulent inlet velocity profile.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 80-0251 , Aerospace Sciences Meeting; Jan 14, 1980 - Jan 16, 1980; Pasadena, CA
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  • 7
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    Effect of velocity overshoot on the performance of magnetohydrodynamic subsonic diffusers (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The evolution of an overshoot velocity distribution was studied in a plane two dimensional diffuser as a function of diffuser divergence angle. The diffuser performance for velocity overshoot was compared to that for a fully developed inlet velocity profile. Results indicate that the ratio of peak-to-center line velocity increases along the diffuser for a diffuser half angle greater than some critical value. It was also found that irrespective of the accompanying inlet temperature distribution, the wall shear stress and the wall heat flux is substantially larger when the inlet velocity profile has an overshoot than that for a fully developed inlet velocity profile.
    Keywords: PLASMA PHYSICS
    Type: NASA-TM-79305 , DOE/NASA/2674-79/8 , E-257 , Aerospace Sci. Meeting; Jan 14, 1980 - Jan 16, 1980; Pasadena, CA; United States
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  • 8
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    Velocity, temperature, and electrical conductivity profiles in hydrogen-oxygen MHD duct flows (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Two-dimensional duct flow computations for radial distributions of velocity, temperature, and electrical conductivity are reported. Calculations were carried out for the flow conditions representative of a hydrogen-oxygen combustion driven MHD duct. Results are presented for: profiles of developing flow in a smooth duct, and for profiles of fully developed pipe flow with a specified streamwise shear stress distribution. The predicted temperature and electrical conductivity profiles for the developing flows compare well with available experimental data.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-78968 , E-9717 , Winter Ann. Meeting of the ASME; Dec 10, 1978 - Dec 15, 1978; San Francisco
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  • 9
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    Streamwise computation of three-dimensional flows using two stream functions (1993)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: An approach to compute 3D flows using two stream functions is presented. The independent variables used are chi, a spatial coordinate, and xi and eta, values of stream functions along two sets of suitably chosen intersecting stream surfaces. The dependent variables used are the streamwise velocity, and two functions that describe the stream surfaces. Since the value of a stream function is constant along the solid boundaries, this choice of variables makes it easy to satisfy the boundary conditions. To illustrate the approach, computations of incompressible potential flow through a circular-to-rectangular transition duct are also presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME, Transactions, Journal of Fluids Engineering (ISSN 0098-2202); 115; 2; p. 233-238.
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  • 10
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    Velocity, temperature, and electrical conductivity profiles in hydrogen-oxygen MHD duct flows (1978)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper presents results of two-dimensional duct flow computations for radial distributions of velocity, temperature, and electrical conductivity. Calculations were carried out for the flow conditions representative of NASA Lewis hydrogen-oxygen combustion driven MHD duct. Results are presented for two sets of computations: (1) profiles of developing flow in a smooth duct, and (2) profiles of fully developed pipe flow with a specified streamwise shear stress distribution. The predicted temperature and electrical conductivity profiles for the developing flows compared well with available experimental data.
    Keywords: PLASMA PHYSICS
    Type: Fluids engineering in advanced energy systems; Winter Annual Meeting; Dec 10, 1978 - Dec 15, 1978; San Francisco, CA
    Format: text
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