Unsteady Evolution of a Laminar Separation Bubble Subjected to Structural Motion

Adrián Grille Guerra, Shirzad Hosseinverdi, Ashish Sing, Jesse Little, Hermann Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

Experiments and direct numerical simulations are employed to investigate the laminar separation bubble that forms on the suction side of a static and plunging wing section for a modified NACA 643 - 618 airfoil at a chord Reynolds number of Re = 200k. The simulations show that the transition process in the separated shear layer is mainly due to the amplification of Kelvin-Helmholtz instabilities, followed by shedding of strong spanwise coherent structures that lead to the reattachment of a turbulent boundary layer. A plunging motion with an amplitude of h = 6% of the chord and a reduced frequency of k = 0.67 is imposed to the wing in a wind tunnel experiment, at a nominal angle of attack of zero degrees. Surface pressure and 2D Particle Image Velocimetry measurements are used to track the unsteady evolution of the bubble along the plunging cycle and its effect on the wing’s loading. A hysteretic behaviour is observed for the bubble size and location during the cycle. No bubble bursting is observed at these conditions, thus having a small impact on the global lift and pitching moment coefficientsof the wing.

Original languageEnglish (US)
Title of host publicationAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624106101
DOIs
StatePublished - 2021
Externally publishedYes
EventAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021 - Virtual, Online
Duration: Aug 2 2021Aug 6 2021

Publication series

NameAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021

Conference

ConferenceAIAA Aviation and Aeronautics Forum and Exposition, AIAA AVIATION Forum 2021
CityVirtual, Online
Period8/2/218/6/21

ASJC Scopus subject areas

  • Aerospace Engineering
  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering

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