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  • 1
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    Engineering computations 16 (1999), S. 767-786 
    ISSN: 0264-4401
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Technology
    Notes: The viscous finite volume lambda formulation is presented. The suggested technique is apt to compute viscous flows with heat fluxes. The inviscid terms are evaluated by means of the non-conservative, very accurate upwind methodology, known as the finite volume lambda formulation. The diffusive terms, on the contrary, are approximated by a central scheme. Both methods are characterized by a nominal second order accuracy in space. Efficiency is enhanced by means of a multigrid technique which directly combines each grid level with each stage of an explicit multistage time integration technique. A laminar viscous flow about a NACA 0012 airfoil and a turbulent one about a RAE 2822 airfoil have been computed as well as the two- and three-dimensional turbulent flows inside the Stanitz elbow. The computed numerical results are in very good agreement with well assessed published numerical or experimental results. The suggested multigrid technique allows significant work reductions for laminar as well as for turbulent flow computations.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 6 (1971), S. 92-100 
    ISSN: 1572-9648
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Summary Reflected and transmitted pressure waves are generated by the interaction which takes place when an incident pressure wave reaches an orifice placed inside a duct, with initial steady flow through the orifice before this interaction. In this paper a theoretical approach for relating reflected and transmitted pressure waves with orifice geometry, initial steady flow conditions and incident pressure wave is outlined. Several experiments were carried out with different incident shock wave intensities and orifice sizes; theoretical and experimental results are then compared and the agreement is quite good. Some anomalous phenomena observed during such experiments are reported.
    Notes: Sommario Quando un'onda di pressione raggiunge un orifizio intubato, attraversato da un flusso preesistente, ne nascono un'onda trasmessa e un'onda riflessa. Nel presente lavoro si affronta teoricamente il problema di correlare l'intensità di tali onde riflessa e trasmessa alle caratteristiche geometriche dell'orifizio, al flusso preesistente, ed all'intensità dell'onda incidente; si confrontano poi tali risultati teorici con quelli ottenuti sperimentalmente su diversi orifizi quando l'onda incidente sia un'onda d'urto, ottenendone un buon accordo. Si segnalano inoltre alcuni fenomeni anomali osservati sperimentalmente.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 28 (1998), S. 1093-1108 
    ISSN: 0271-2091
    Keywords: boundary conditions ; Euler equations ; finite volume ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The implementation of boundary conditions at rigid, fixed wall boundaries in inviscid Euler solutions by upwind, finite volume methods is considered. Some current methods are reviewed. Two new boundary condition procedures, denoted as the symmetry technique and the curvature-corrected symmetry technique are then presented. Their behaviour in relation to the problem of the subsonic flow about blunt and slender elliptic bodies is analysed. The subsonic flow inside the Stanitz elbow is then computed. The symmetry technique is proven to be as accurate as one of the current methods, second-order pressure extrapolation technique. Finally, for arbitrary curved geometries, dramatic advantages of the curvature-corrected symmetry technique over the other methods are shown. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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