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    Effects of Structural Motion on Separation and Separation Control: An Integrated Investigation using Numerical Simulations, Theory, Wind-Tunnel and Free-Flight Experiments

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    Author
    Fasel, Hermann F.
    Hosseinverdi, Shirzad
    Jesse, Little
    Gross, Andreas
    Issue Date
    2017-01
    
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    Publisher
    TU Braunschweig – Niedersächsisches Forschungszentrum für Luftfahrt
    Rights
    Copyright © 2017 The Author(s).
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    A combined investigative approach which employs high-fidelity numerical simulations, wind & water-tunnel and free-flight experiments is taken to investigate the fundamental flow physics of separation and separation control for wing sections undergoing temporal motions. Detailed investigations of the underlying unsteady flow physics have been carried out for the X-56A airfoil at nominal angles of attack of 10 and 12 degrees for Re = 200k. The reduced frequency of the structural motion is k=0.7 and the plunging amplitude is 3.2% and 4.8% of the chord length. For 10deg AoA, the agreement between the measurements, simulations, and Theodorsen's theory is good even though the instantaneous angles of attack during the airfoil oscillations are outside the linear CL - AoA regime and extend into the region associated with static stall. As the angle of attack is increased to 12deg, the flow over the suction surface of the wing begins to intermittently separate and Theodorsen's theory fails. Experiments and simulations show strong qualitative agreement and both capture "bursting" of the laminar separation bubble near the leading edge of the airfoil. Furthermore, highly resolved Direct Numerical Simulations (DNS) were performed in order to investigate the hydrodynamic instability mechanisms and transition to turbulence in swept laminar separation bubbles.
    Version
    Final published version
    Additional Links
    https://ostiv.org/files/ostiv-docs/congress/2017/Ostiv_Book_long_final.pdf
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    UA Faculty Publications

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