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  • 1985-1989  (13)
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  • 1
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    A simulation of rotor-stator interaction using the Euler equations and patched grids (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Patched-grid calculations with the Euler and Navier-Stokes equations: Theory and application (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Rai (1984,85) patch-boundary scheme for the Euler equations is described. The integration methods used to update the interior grid points are are discussed. Stability of patch-boundary schemes and the use of these schemes in Navier-Stokes calculations are mentioned. Results for inviscid, supersonic flow over a cylinder, blast wave diffraction by ramp, and the motion of a vortex in a freestream are presented. These test cases demonstrate the quality of solutions possible with the scheme.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Von Karman Inst. for Fluid Dynamics Computational Fluid Dynamics, Volume 1; 102 p
    Format: text
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  • 3
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    An implicit form for the Osher upwind scheme (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: AERODYNAMICS
    Type: AIAA Journal (ISSN 0001-1452); 24; 735-743
    Format: text
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  • 4
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    Three-dimensional, conservative, Euler computations using patched grid systems and explicit methods (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The method of 'zonal approach' (in which the flow field is partitioned into regions with independent grids) for computation of flow over complex geometries, such as aircraft configuration, requires application of a grid-interfacing procedure. A three-dimensional conservative, boundary scheme for patched grids, applicable in generalized coordinates for arbitrary point distributions on a planar zonal surface is presented. The computation technique is derived within the framework of the Osher (1983) upwind scheme, using Euler equations. The three-dimensional interfacing method is applied to the computation of flow about a wing-canard combination using a two-zone, patched grid.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 86-1081
    Format: text
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  • 5
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    A simulation of rotor-stator interaction using the Euler equations and patched grids (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An unsteady Euler code to study rotor-stator interaction problem was developed. The code uses patched grids that move relative to each other to simulate the motion of the rotor airfoils with respect to the stator airfoils. The Osher integration scheme is used in conjunction with an implicit relaxation approach. The scheme is second order accurate in space and time, and is also TVD in each spatial direction. The numerical results were found to be periodic in time, thus demonstrating the capability of the integration and zonal schemes in simulating periodic time dependent flow. The pressure contours obtained are almost oscillation free because of the TVD nature of the scheme. A new procedure was developed to simulate flows about bodies that move relative to each other. This capability should prove to be very useful in the areas of rotor-stator interaction, propeller-nacelle interaction, and helicopter rotor-fuselage interaction.
    Keywords: NUMERICAL ANALYSIS
    Type: NASA-TM-86821 , A-85376 , NAS 1.15:86821
    Format: application/pdf
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  • 6
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    Grid refinement studies of turbine rotor-stator interaction (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results from a three-dimensional, time-accurate Navier-Stokes simulation of rotor-stator interaction in an axial turbine stage are presented. The present study uses a fine grid in the spanwise direction to better resolve endwall and tip cllearance effects and complements coarse-grid calculations that were reported earlier. A realistic turbine stage with 22 stator vanes and 28 rotor blades is simulated as a single-stator, single-rotor airfoil combination with the stator geometry modified to properly account for blockage effects. This is in contrast to the earlier coarse-grid calculations where the rotor geometry was modified. The improved grid resolution and the unmodified rotor geometry result in a more accurate simulation of the flow field, particularly in the rotor channel where the interaction effects are more severe. The numerical results are compared to experimental data wherever possible and to earlier calculations.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 89-0325
    Format: text
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  • 7
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    Unsteady aerodynamics of rotor-stator interaction in a turbine stage (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The two-dimensional, compressible, unsteady, thin-layer Navier-Stokes equations have been used to study the turbulent flow field of a turbine rotor/stator configuration in the high pressure oxidizer turbopump of the Space Shuttle main engine. The calculations were performed on a system of patched and overlaid grids. The grid system consists of 'O-' and 'H-' grids, with the inner 'O-'grid enclosing the blade surface for an accurate resolution of the leading and trailing edges, while the outer 'H-'grid makes the treatment of boundary conditions easier. The integration scheme used is an iterative, factored, implicit method with numerical fluxes evaluated by the third-order accurate upwind-biased Osher scheme. Computed results in the form of pressure contours, Mach number contours, time-averaged surface pressure, unsteady pressure amplitude and unsteady velocity vectors are presented. Many flow phenomena, such as wake cutting by rotor airfoils and evolution of unsteady passage vortices, are discussed.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 88-0360
    Format: text
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  • 8
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    An implicit, conservative, zonal-boundary scheme for Euler equation calculations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A 'zonal', or 'patched-grid', approach is one in which the flow region of interest is divided into subregions which are then discretized independently, using existing grid generators. The equations of motion are integrated in each subregion in conjunction with zonal-boundary schemes which allow proper information transfer across interfaces that separate subregions. The zonal approach greatly simplifies the treatment of complex geometries and also the addition of grid points to selected regions of the flow. In this study a conservative, zonal-boundary condition that could be used with explicit schemes has been extended so that it can be used with existing second-order-accurate implicit integration schemes such as the Beam-Warming and Osher schemes. In the test case considered, the implicit schemes increased the rate of convergence considerably (by a factor of about 30 over that of the explicit scheme). Results demonstrating the time-accuracy of the zonal scheme and the feasibility of performing calculations on zones that move relative to each other are also presented.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 85-0488
    Format: text
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  • 9
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    A relaxation approach to patched-grid calculations with the Euler equations (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A conservative zonal-boundary condition that was used with explicit integration schemes is extended to implicit, upwind, relaxation schemes; in particular to the Osher scheme. The rate of convergence was found to increase considerably with the use of the implicit, relaxation-zonal scheme when compared to the explicit scheme. The relaxation-zonal scheme has also been used in a time-accurate mode. Results demonstrating the time accuracy of the scheme and the feasibility of performing calculations in cases where some parts of the given system move relative to others (for example, rotor-stator configurations) are presented.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 85-0295
    Format: text
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  • 10
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    An implicit, conservative, zonal-boundary scheme for Euler equation calculations (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A zonal, or patched, grid approach is one in which the flow region of interest is divided into subregions which are then discretized independently, using existing grid generators. The equations of motion are integrated in each subregion in conjunction with zonal boundary schemes which allow proper information transfer across interfaces that separate subregions. The zonal approach greatly simplifies the treatment of complex geometries and also the addition of grid points to selected regions of the flow. A conservative, zonal boundary condition that could be used with explicit schemes was extended so that it can be used with existing second order accurate implicit integration schemes such as the Beam-Warming and Osher schemes. In the test case considered, the implicit schemes increased the rate of convergence considerably (by a factor of about 30 over that of the explicit scheme). Results demonstrating the time accuracy of the zonal scheme and the feasibility of performing calculations on zones that move relative to each other are also presented.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-3865 , A-9823 , NAS 1.26:3865
    Format: application/pdf
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