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Wavepackets in turbulent flow over a NACA 4412 airfoil
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll.ORCID-id: 0000-0001-9627-5903
KTH, Skolan för teknikvetenskap (SCI), Mekanik, Stabilitet, Transition, Kontroll.ORCID-id: 0000-0001-6570-5499
Vise andre og tillknytning
2018 (engelsk)Inngår i: 31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, International Council of the Aeronautical Sciences , 2018Konferansepaper, Publicerat paper (Fagfellevurdert)
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). 

sted, utgiver, år, opplag, sider
International Council of the Aeronautical Sciences , 2018.
Emneord [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
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Identifikatorer
URN: urn:nbn:se:kth:diva-247426Scopus ID: 2-s2.0-85060443174ISBN: 9783932182884 (tryckt)OAI: oai:DiVA.org:kth-247426DiVA, id: diva2:1302018
Konferanse
31st Congress of the International Council of the Aeronautical Sciences, ICAS 2018, 9 September 2018 through 14 September 2018
Merknad

QC 20190403

Tilgjengelig fra: 2019-04-03 Laget: 2019-04-03 Sist oppdatert: 2019-05-20bibliografisk kontrollert

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Schlatter, PhilippVinuesa, RicardoHenningson, Dan S.

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