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A Combined Experimental/Numerical Study of Unsteady Phenomena in a Laminar Separation Bubble

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Abstract

A laminar boundary layer separates in a region of adverse pressure gradient on a flat plate and undergoes transition. Finally the turbulent boundary layer reattaches, forming a laminar separation bubble (LSB). Laminar-turbulent transition within such a LSB is investigated by means of Laser-Doppler-Anemometry (LDA), Particle Image Velocimetry (PIV), and direct numerical simulation (DNS). The transition mechanism occurring in the flow-field under consideration is discussed in detail. Observations for the development of small disturbances are compared to predictions from viscous linear instability theory (Tollmien–Schlichting instability). Non-linear development of these disturbances and their role in final breakdown to turbulence is analyzed.

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Authors and Affiliations

  1. Institut für Aerodynamik und Gasdynamik (IAG), Universität Stuttgart, Pfaffenwaldring 21, 70550, Stuttgart, Germany

    O. Marxen, M. Lang, U. Rist & S. Wagner

Authors
  1. O. Marxen
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  2. M. Lang
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  3. U. Rist
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  4. S. Wagner
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Marxen, O., Lang, M., Rist, U. et al. A Combined Experimental/Numerical Study of Unsteady Phenomena in a Laminar Separation Bubble. Flow, Turbulence and Combustion 71, 133–146 (2003). https://doi.org/10.1023/B:APPL.0000014928.69394.50

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  • DOI: https://doi.org/10.1023/B:APPL.0000014928.69394.50

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