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LES of the unsteady response of a natural laminar flow airfoil
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-3344-9686
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0002-5913-5431
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, Centres, SeRC - Swedish e-Science Research Centre.ORCID iD: 0000-0001-7864-3071
2018 (English)In: 2018 Applied Aerodynamics Conference, American Institute of Aeronautics and Astronautics, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Large-eddy simulations are performed to investigate the dynamic response of a natural laminar flow airfoil undergoing harmonic pitch oscillations at a chord based Reynolds number of Rec= 750, 000. Large changes in the transition location are observed throughout the pitch cycles which leads to a non-linear response of the aerodynamic force coefficients. Preliminary results show that the evolution of the boundary layer over the airfoil can be modeled by using a simple phase-lag concept which implies that the boundary-layer evolution is quasi-steady in nature. A simple empirical model is developed based on this quasi-steady, phase-lag assumption which fits very well with the measured experimental data.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics, 2018.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-234512DOI: 10.2514/6.2018-3824Scopus ID: 2-s2.0-85051738799ISBN: 9781624105593 (print)OAI: oai:DiVA.org:kth-234512DiVA, id: diva2:1246252
Conference
36th AIAA Applied Aerodynamics Conference, 2018, [state] GA, United States, 25 June 2018 through 29 June 2018
Funder
VINNOVAEU, European Research CouncilSwedish e‐Science Research Center
Note

QC 20180907

Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2019-12-20Bibliographically approved

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Negi, Prabal SinghHanifi, ArdeshirHenningson, Dan S.

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