Although there is considerable interest in using wall suction to increase boundary-layer stability, stability analyses suggest that porous walls are inherently destabilizing. We explore this contradiction by performing a spatial linear stability analysis of the asymptotic suction boundary layer using a realistic model of wall suction. The porous wall is modelled as a layer of rigid, homogeneous, isotropic, porous material of small permeability, in which inertial effects may be neglected. The porous layer is bounded above by a semi-infinite region in which a boundary layer is driven by a constant freestream velocity. The wall suction is created by applying a suction pressure to a semi-infinite region below the porous layer. Our stability analysis takes account of the full coupling between the flowfields in the boundary-layer and suction regions, governed by the Navier–Stokes equations, and the flow in the porous layer, governed by the volume-averaged Navier–Stokes equations. We find that small amounts of wall permeability destabilize the Tollmien–Schlichting wave and cause a substantial broadening of the unstable region. As a result, the stabilization of boundary layers by wall suction is substantially less effective and more expensive than what is predicted by classical boundary-layer theory.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Stability of Boundary Layers over Porous Walls with Suction


    Beteiligte:
    Tilton, Nils (Autor:in) / Cortelezzi, Luca (Autor:in)

    Erschienen in:

    AIAA Journal ; 53 , 10 ; 2856-2868


    Erscheinungsdatum :

    01.10.2015




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    "Stability of Boundary Layers with Non-Uniform Suction"

    Floryan, J. M. / Roberts, P. J. D. / Arnal, D. et al. | British Library Conference Proceedings | 1999