The receptivity to localized surface roughness of a swept-wing boundary layer is studied by direct numerical simulation (DNS) and computations using the parabolized stability equations (PSEs). The DNS is laid out to reproduce wind tunnel experiments performed by Saric and coworkers, where micron-sized cylinders were used to trigger steady crossflow modes. The amplitudes of the roughness-induced fundamental crossflow wave and its superharmonics obtained from nonlinear PSE solutions agree excellently with the DNS results. A receptivity model using the direct and adjoint PSEs is shown to provide reliable predictions of the receptivity to roughness cylinders of different heights and chordwise locations. Being robust and computationally efficient, the model is well suited as a predictive tool of receptivity in flows of practical interest. The crossflow mode amplitudes obtained based on both DNS and PSE methods are 40 % of those measured in the experiments. Additional comparisons between experimental and PSE data for various disturbance wavelengths reveal that the measured disturbance amplitudes are consistently larger than those predicted by the PSE-based receptivity model by a nearly constant factor. Supplementary DNS and PSE computations suggest that possible natural leading-edge roughness and free-stream turbulence in the experiments are unlikely to account for this discrepancy. It is more likely that experimental uncertainties in the streamwise location of the roughness array and cylinder height are responsible for the additional receptivity observed in the experiments.


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    Titel :

    Swept wing boundary-layer receptivity to localized surface roughness


    Weitere Titelangaben:

    Abhängigkeit der Pfeilflügel-Grenzschicht von der lokalen Oberflächenrauigkeit


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2012


    Format / Umfang :

    29 Seiten, 19 Bilder, 1 Tabelle, 53 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    BOUNDARY-LAYER RECEPTIVITY OF THREE-DIMENSIONAL ROUGHNESS ARRAYS ON A SWEPT-WING

    Hunt, L. / Saric, W. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011



    Simulation of Swept-Wing Receptivity to Distributed Roughness

    Mistry, Vinan / Page, Gary / McGuirk, James J. | AIAA | 2013



    Numerical Study of Boundary-layer Receptivity on a Swept Wing

    Templemann, D. / Hanifi, A. / Brandt, L. et al. | British Library Conference Proceedings | 2011