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DNS of Laminar-Turbulent Transition in Separation Bubbles

In: High Performance Computing in Science and Engineering ’99

Author

Listed:
  • U. Maucher

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

  • U. Rist

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

  • M. Kloker

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

  • S. Wagner

    (Universität Stuttgart, Institut für Aerodynamik und Gasdynamik)

Abstract

A Laminar Separation Bubble (LSB) is created under the influence of an adverse (positive) pressure gradient along a wall by laminar separation, laminar-turbulent transition and turbulent re-attachment of the flow to the wall. Direct Numerical Simulations (DNS) of the flow in an airfoil boundary layer which are based on solving the full Navier-Stokes equations exhibit good quantitative agreement of the mean-flow data with wind-tunnel experiments, but only examinations of the unsteady results are able to reveal the underlying physics. Thus, a hitherto unknown temporal amplification of three-dimensional small-amplitude disturbances is observed and explained by the entrainment of three-dimensional fluctuations by the roll-up of the detached boundary layer. Once the three-dimensional disturbances become saturated this mechanism leads to a rapid breakdown of the laminar flow into regions of small-scale turbulence which are organized in a quasi two-dimensional coherent manner.

Suggested Citation

  • U. Maucher & U. Rist & M. Kloker & S. Wagner, 2000. "DNS of Laminar-Turbulent Transition in Separation Bubbles," Springer Books, in: Egon Krause & Willi Jäger (ed.), High Performance Computing in Science and Engineering ’99, pages 279-294, Springer.
    • Handle: RePEc:spr:sprchp:978-3-642-59686-5_24
    DOI: 10.1007/978-3-642-59686-5_24
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