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Wavepackets in turbulent flow over a NACA 4412 airfoil
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-9627-5903
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control.ORCID iD: 0000-0001-6570-5499
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2018 (English)In: 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, International Council of the Aeronautical Sciences , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Turbulent flow over a NACA 4412 airfoil with an angle of attack AoA = 5◦ was analysed using an incompressible direct numerical simulation (DNS) at chord Reynolds number of Rec = 4 · 105. Snapshots of the flow field were analysed using the method of Spectral Proper Orthogonal Decomposition (SPOD) in frequency domain, in order to extract the dominant coherent structures of the flow. Focus is given to two-dimensional disturbances, known to be most relevant for aeroacoustics. The leading SPOD modes show coherent structures forming a wavepacket, with significant amplitudes in the trailing-edge boundary layer and in the wake. To model coherent structures in the turbulent boundary layer, the optimal harmonic forcing and the associated linear response of the flow were obtained using the singular value decomposition of the linear resolvent operator. The resolvent analysis shows that the leading SPOD modes can be associated to most amplified, linearised flow responses. Furthermore, coherent structures in the wake are modelled as the Kelvin-Helmholtz mode from linear stability theory (LST). 

Place, publisher, year, edition, pages
International Council of the Aeronautical Sciences , 2018.
Keywords [en]
Coherent structures, Reduced order models, Resolvent analysis, SPOD, Wavepackets, Airfoils, Angle of attack, Boundary layer flow, Boundary layers, Frequency domain analysis, Principal component analysis, Reynolds number, Sailing vessels, Singular value decomposition, Wakes, Wave packets, Coherent structure, Kelvin-Helmholtz modes, Linear stability theory, Proper orthogonal decompositions, Turbulent boundary layers, Atmospheric thermodynamics
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-247426Scopus ID: 2-s2.0-85060443174ISBN: 9783932182884 (print)OAI: oai:DiVA.org:kth-247426DiVA, id: diva2:1302018
Conference
31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, 9 September 2018 through 14 September 2018
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-05-20Bibliographically approved

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Schlatter, PhilippVinuesa, RicardoHenningson, Dan S.

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