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  • 1
    Electronic Resource
    Electronic Resource
    On the deviatoric normal stress on a slip surface (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 12 (2000), S. 3280-3281 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A general formula for the deviatoric normal stress on a slip surface for incompressible flows is derived and its application is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1321259
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  • 2
    Electronic Resource
    Electronic Resource
    STABILITY AND TRANSITION OF THREE-DIMENSIONAL BOUNDARY LAYERS (2003)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 35 (2003), S. 413-440 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The recent progress in three-dimensional boundary-layer stability and transition is reviewed. The material focuses on the crossflow instability that leads to transition on swept wings and rotating disks. Following a brief overview of instability mechanisms and the crossflow problem, a summary of the important findings of the 1990s is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fluid.35.101101.161045
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of curvature variations on the nonlinear evolution of Goertler vortices (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 3353-3367 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nonlinear development of Goertler vortices over walls of variable curvature is studied. The parabolized disturbance equations governing the problem for small curvature, high Reynolds number, and order unity Goertler number are integrated numerically. Cases with concave, convex, and zero curvatures are analyzed. The "mushroom-shaped'' distributions of low-momentum fluid riding above high-momentum fluid that are subject to secondary instability are predicted. The results show significant stabilization of disturbances introduced from a concave into a convex region, where new sets of vortices are successively created with opposite rotation to the preceding set. The convex curvature tends to eliminate the inflection points from the spanwise and normal profiles of the streamwise velocity and, hence, suppresses the oscillatory secondary instability that leads to turbulence. Decay of Goertler vortices in a flat region is found to be less rapid than in a convex region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868394
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  • 4
    Electronic Resource
    Electronic Resource
    BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM DISTURBANCES (2002)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 34 (2002), S. 291-319 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The current understanding of boundary-layer receptivity to external acoustic and vortical disturbances is reviewed. Recent advances in theoretical modeling, numerical simulations, and experiments are discussed. It is shown that aspects of the theory have been validated and that the mechanisms by which freestream disturbances provide the initial conditions for unstable waves are better understood. Challenges remain, however, particularly with respect to freestream turbulence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fluid.34.082701.161921
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  • 5
    Electronic Resource
    Electronic Resource
    Stability of liquid films adjacent to compressible streams (1975)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 26 (1975), S. 771-788 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Résumé Une analyse est presentée pour la stabilité linéaire d'une couche liquide adjacente à un gaz visqueux et compressible. L'analyse est valable pour toutes les longueurs d'onde et pour tous les nombres de Reynolds des liquides. Les perturbations de pression et de cisaillement exercées par le gaz sur le liquide sont calculées (utilisant) au moyen d'un modèle qui tient compte de la viscosité, du profil des vitesses et du transfert de chaleur. Les résultats montrent qu'un modèle qui (ignore) fait abstraction de la viscosité et qui suppose que l'écoulement est uniforme n'est suffisant que si la couche limite perturbée est très mince. Quoique l'analyse linéaire actuelle s'accorde assez bien avec les expériences sur les écoulements subsoniques, cette analyse ne prédit pas les longueurs d'onde et les vitesses d'onde observées pour le cas supersonique.
    Notes: Abstract An analysis is presented for the linear stability of a liquid film, adjacent to a compressible viscous gas stream. The analysis is valid for all wavelengths and liquid Reynolds numbers. The pressure and shear perturbations exerted by the gas on the liquid are calculated, using a gas model which takes into account the gas viscosity, velocity profile, and heat transfer. The results show that an inviscid, uniform stream model for the gas is inadequate unless the disturbed boundary layer is very thin. Although the present linear analysis is in fairly good agreement with the experimental observations for subsonic flow, it does not predict the observed wavelengths and wave speeds for supersonic flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596080
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  • 6
    Electronic Resource
    Electronic Resource
    Nonlinear Stability and Transition in 3-D Boundary Layers (1998)
    Springer
    Meccanica 33 (1998), S. 469-487 
    Details
    ISSN: 1572-9648
    Keywords: Stability ; Nonlinear waves ; Transition ; Boundary layers ; Fluid mechanics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The important recent progress in three-dimensional boundary-layer transition research is reviewed with emphasis on the crossflow instability that leads to transition on swept wings with a favorable pressure gradient. Following a brief overview of swept-wing instability mechanisms and the crossflow problem, a summary of the important findings of the 1990s is given. The discussion is presented from the experimental viewpoint, and where appropriate, relevant comparisons with CFD are drawn. The recent research conducted with distributed roughness is described in more detail in order to underscore the latest developments concerning nonlinear effects and transition control. Sommario. I recenti importanti sviluppi sullo studio della tansizione in uno strato limite tridimensionale sono esaminati con particolare attenzione alla instabilità trasversale che conduce alla transizione su ali a freccia con gradiente di pressione favorevole. Dopo una breve descrizione dei meccanismi di instabilità sulle ali a freccia viene dato un riassunto degli importanti progressi ottenuti negli anni '90. La discussione è presentata dal punto di vista sperimentale e, ove appropriato, sono riportati confronti con la simulazione numerica. La recente ricerca, condotta con rugosità distribuita,è descritta con maggiore dettaglio allo scopo di presentare gli ultimi sviluppi concernenti gli effetti non lineari ed il controllo della transizione.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004368526215
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