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    Multigrid calculation of three-dimensional viscous cascade flows (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A 3-D code for viscous cascade flow prediction was developed. The space discretization uses a cell-centered scheme with eigenvalue scaling to weigh the artificial dissipation terms. Computational efficiency of a four stage Runge-Kutta scheme is enhanced by using variable coefficients, implicit residual smoothing, and a full multigrid method. The Baldwin-Lomax eddy viscosity model is used for turbulence closure. A zonal, nonperiodic grid is used to minimize mesh distortion in and downstream of the throat region. Applications are presented for an annular vane with and without end wall contouring, and for a large scale linear cascade. The calculation is validated by comparing with experiments and by studying grid dependency.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TM-105257 , ICOMP-91-18 , E-6587 , NAS 1.15:105257
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Pseudo-compressibility methods for the incompressible flow equations (1993)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Preconditioning methods to accelerate convergence to a steady state for the incompressible fluid dynamics equations are considered. The analysis relies on the inviscid equations. The preconditioning consists of a matrix multiplying the time derivatives. Thus the steady state of the preconditioned system is the same as the steady state of the original system. The method is compared to other types of pseudo-compressibility. For finite difference methods preconditioning can change and improve the steady state solutions. An application to viscous flow around a cascade with a non-periodic mesh is presented.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-CR-191533 , NAS 1.26:191533 , ICASE-93-66 , AD-A273657
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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