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  • 1
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    A Navier-Stokes solver for turbomachinery applications (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A computer code for solving the Reynolds-averaged full Navier-Stokes equations has been developed and applied using H- and C-type grids. The Baldwin-Lomax eddy-viscosity model is used for turbulence closure. The integration in time is based on an explicit four-stage Runge-Kutta scheme. Local time stepping, variable coefficient implicit residual smoothing, and a full multigrid method have been implemented to accelerate steady-state calculations. A grid independence analysis is presented for a transonic rotor blade. Comparisons with experimental data show that the code is an accurate viscous solver and can give very good blade-to-blade predictions for engineering applications.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: ASME, Transactions, Journal of Turbomachinery (ISSN 0889-504X); 115; 2; p. 305-313.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Navier-Stokes analysis of transonic cascade flow (1990)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new kind of C-type grid is proposed, this grid is non-periodic on the wake and allows minimum skewness for cascades with high turning and large camber. Reynolds-averaged Navier-Stokes equations are solved on this type of grid using a finite volume discretization and a full multigrid method which uses Runge-Kutta stepping as the driving scheme. The Baldwin-Lomax eddy-viscosity model is used for turbulence closure. A detailed numerical study is proposed for a highly loaded transonic blade. A grid independence analysis is presented in terms of pressure distribution, exit flow angles, and loss coefficient. Comparison with experiments clearly demonstrates the capability of the proposed procedure.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-103624 , E-5791 , NAS 1.15:103624 , ICOMP-90-23
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Viscous analysis of three-dimensional rotor flows using a multigrid method (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A three-dimensional code for rotating blade-row flow analysis was developed. The space discretization uses a cell-centered scheme with eigenvalues scaling for the artificial dissipation. The computational efficiency of a four-stage Runge-Kutta scheme is enhanced by using variable coefficients, implicit residual smoothing, and a full-multigrid method. An application is presented for the NASA rotor 67 transonic fan. Due to the blade stagger and twist, a zonal, non-periodic H-type grid is used to minimize the mesh skewness. The calculation is validated by comparing it with experiments in the range from the maximum flow rate to a near-stall condition. A detailed study of the flow structure near peak efficiency and near stall is presented by means of pressure distribution and particle traces inside boundary layers.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-TM-106266 , ICOMP-93-25 , E-7993 , NAS 1.15:106266
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A Navier-Stokes solver for cascade flows (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A computer code for solving the Reynolds averaged full Navier-Stokes equations has been developed and applied using sheared H-type grids. The Baldwin-Lomax eddy-viscosity model is used for turbulence closure. The integration in time is based on an explicit four-stage Runge-Kutta scheme. Local time stepping, variable coefficient implicit residual smoothing, and a full multigrid method have been implemented to accelerate steady state calculations. Comparisons with experimental data show that the code is an accurate viscous solver and can give very good blade-to-blade predictions for engineering applications in less than 100 multigrid cycles on the finest mesh.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-181682 , ICASE-88-32 , NAS 1.26:181682
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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