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  • 1
    Electronic Resource
    Electronic Resource
    Evaluation of Navier-Stokes and Euler solutions for leading-edge separation vortices (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 1319-1329 
    Details
    ISSN: 0271-2091
    Keywords: Numerical simulation ; Vortical flow ; Navier-Stokes and Euler equations ; Double-delta wing ; Vortex interaction ; Vortex breakdown ; Grid resolution ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Extensive study on the numerical simulation of the vortical flow over a double-delta wing is carried out using the ‘thin layer’ Navier-Stokes and Euler equations. Two important flow characteristics, vortex interaction and vortex breakdown, are successfully simulated. Grid resolution is one of the most important factors associated with the vortex problem. Computations were performed on a series of grids with various levels of refinement, coarse, medium and fine. Computations using either the coarse or medium grids fail to capture the proper physical phenomena. The computed result using a fine grid shows flow unsteadiness once the vortex breakdown takes place. The CL-α characteristics are well predicted up to the breakdown angle of attack for all the grid distributions. The Euler solutions show fairly good agreement with experiment on the CL-α characteristics. However, other aspects of the solution at each angle of attack, such as the locus of the leading-edge separation vortex, are not consistent with experiment. Even for the fine grid Navier-Stokes computations, further grid resolution is required to obtain good quantitative agreement with experiment.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650081014
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Numerical simulation of cooling-induced convective currents on a littoral slope (1994)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 19 (1994), S. 105-134 
    Details
    ISSN: 0271-2091
    Keywords: Numerical simulation ; Transient ; Cooling-induced currents ; Littoral slope ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The transient development of cooling-induced flow in a triangular domain filled with water is studied by means of numerical simulation as a model for flow developing in the littoral region of lakes or coasts. The domain is fitted in polar co-ordinates; solutions are obtained for different values of the independent parameters of the model, which are the Rayleigh number (Ra), the Prandtl number (Pr) and the slope of the domain (S). Within the ranges examined, as Ra is increased, different regimes of the developing flow are observed; these are found qualitatively to be insignificantly influenced by changes in S, whereas the flow is found to be quantitatively insensitive to Pr for high enough values of Pr. Several interesting features of the flow are depicted and integral values useful in the analysis of flow in lakes are extracted.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650190203
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  • 3
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    Multipassage three-dimensional Navier-Stokes simulation of turbine rotor-stator interaction (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Keywords: AERODYNAMICS
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 9; 3; p. 389-396.
    Format: text
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  • 4
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    Evaluation of Navier-Stokes and Euler solutions for leading-edge separation vortices (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Extensive study on the numerical simulation of the vortical flow over a double delta wing is carried out using the thin layer Navier-Stokes and Euler equations. Two important flow characteristics, vortex interaction and vortex breakdown, are successfully simulated. Grid resolution is one of the most important factors associated with the vortex problem. Computations were performed on a series of grids with various levels of refinement, coarse, medium, and fine. Computations using either the coarse or medium grids fail to capture the proper physical phenomena. The computed result using a fine grid shows flow unsteadiness once the vortex breakdown takes place. The C sub L - alpha characteristics are well predicted up to the breakdown angle of attack for all the grid distributions. The Euler solutions show fairly good agreement with the experiment on the C sub L - alpha characteristics. However, other aspects of the solution at each angle of attack, such as the locus of the leading edge separation vortex, are not consistent with the experiment. Even for the fine grid Navier-Stokes computations, further grid resolution is required to obtain good quantitative agreement with the experiment.
    Keywords: AERODYNAMICS
    Type: NASA-TM-89458 , A-87202 , NAS 1.15:89458
    Format: application/pdf
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  • 5
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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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  • 6
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    A multi-passage three-dimensional Navier-Stokes simulation of turbine rotor-stator interaction (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper deals with the development and validation of a 3D multipassage Navier-Stokes code for predicting the unsteady effects due to rotor-stator interaction in turbomachines. Prior work in two dimensions has demonstrated the necessity of including multiple rotor and stator passages in order to closely approximate the stator-to-rotor airfoil count ratio and thus accurately predict the unsteady flowfield resulting from rotor-stator interaction. In the present paper, this multipassage capability is extended to three dimensions. Numerical results obtained from a multipassage (three stator and four rotor passage) calculation of an axial turbine stage are presented. The stator-to-rotor airfoil count ratio (3:4) used in the present calculations is a close approximation to that in the actual turbine configuration (22:28). The present multipassage calculation results in a more accurate prediction of the unsteady flowfield than that possible from a single-passage calculation.
    Keywords: AERODYNAMICS
    Type: AIAA PAPER 91-2464
    Format: text
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  • 7
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    Evaluation of Navier-Stokes and Euler solutions for leading-edge separation vortices (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Extensive study on the numerical simulation of the vortical flow over a double delta wing is carried out using the thin layer Navier-Stokes and Euler equations. Two important flow characteristics, vortex interaction and vortex breakdown, are successfully simulated. Grid resolution is one of the most important factors associated with the vortex problem. Computations were performed on a series of grids with various levels of refinement, coarse, medium, and fine. Computations using either the coarse or medium grids fail to capture the proper physical phenomena. The computed result using a fine grid shows flow unsteadiness once the vortex breakdown takes place. The C sub L - alpha characteristics are well predicted up to the breakdown angle of attack for all the grid distributions. The Euler solutions show fairly good agreement with the experiment on the C sub L - alpha characteristics. However, other aspects of the solution at each angle of attack, such as the locus of the leading edge separation vortex, are not consistent with the experiment. Even for the fine grid Navier-Stokes computations, further grid resolution is required to obtain good quantitative agreement with the experiment.
    Keywords: AERODYNAMICS
    Type: Numerical methods in laminar and turbulent flow; Jul 06, 1987 - Jul 10, 1987; Montreal; Canada
    Format: text
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  • 8
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    Navier-Stokes Simulation Of Wind-Tunnel Flow (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes three-dimensional Navier-Stokes simulation of transonic flow past model wing in wind tunnel and in free air. Numerical integration performed by LU-ADI factorization algorithm. Simulation shows effects of walls of tunnel.
    Keywords: MECHANICS
    Type: ARC-12193 , NASA Tech Briefs (ISSN 0145-319X); 15; 10; P. 85
    Format: text
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