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  • 1
    Electronic Resource
    Electronic Resource
    A numerical investigation of aerofoil boundary-layer manipulator profile for cruise-flight conditions (1995)
    Springer
    Flow, turbulence and combustion 54 (1995), S. 267-280 
    Details
    ISSN: 1573-1987
    Keywords: aerofoil manipulators ; LEBUs ; CFD ; drag prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A computational study has been conducted to determine the variation of device drag with profile shape and angle of attack for aerofoil boundary-layer manipulators (LEBUs) operating at high subsonic Mach numbers. Calculations have been made at a free-stream Mach number of 0.80 for both symmetrical and asymmetrical NACA-00xx and 44xx series devices including an inverted cambered NACA-4409 profile. The LEBUs considered were located in a turbulent boundary-layer at a mid-chord heighth equivalent to 0.67δ from the wall. The present investigations sought to confirm suggestions based upon experimental observations that there may be some advantage in replacing a symmetrical device by an inverted asymmetrical profile form. The computations were performed using an unstructured adaptive-mesh 3D Navier-Stokes code incorporating a Lam and Bremhorst low-Reynolds number two-equationk — ε turbulence model. The calculated flow field around a NACA-0009 aerofoil at zero angle of attack was initially verified against experimental interferometric data. The calculated device drag coefficient at zero incidence was 0.026 for the NACA-0009, similar to that measured in experiments. However predicted drag for an inverted NACA-4409 was 0.085, this being considerably higher than anticipated. The results suggested that a slightly positive angle of attack may help minimise device drag but neither profile is appropriate for use in transonic conditions. Improved results may be obtained from inverted flat-topped profiles designed to minimise losses associated with localised shocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00863513
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The application of multigrid to Navier-Stokes simulation of 3D flow in axial and radial flow turbomachinery (1988)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 8 (1988), S. 1217-1227 
    Details
    ISSN: 0271-2091
    Keywords: Multigrid ; 3D Navier-Stokes solver ; Flow in turbomachinery ; 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: This paper describes the implementation of a 3D Navier-Stokes solver within the framework of a multigrid strategy. The ability of multigrid to improve and sustain code performance over a range of mesh sizes and a variety of difficult flow problems is investigated. The code is applied to the study of the shock-induced boundary layer separation on a channel hump, the flow in a 2D cascade of compressor blades, the secondary flow development in a linear cascade of gas turbine blades and the Eckardt backswept centrifugal impeller. In each case multigrid leads to significantly improved performance.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/fld.1650081009
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    Paper (German National Licenses)
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