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Coherent Structures in Critical Wing Flows

Kreplin, Hans-Peter und Kindler, Kolja und Ronneberger, Dirk (2004) Coherent Structures in Critical Wing Flows. 12th International Symposium „Application of laser techniques to fluid mechanics“, 2004-07-12 - 2004-07-15, Lissabon, Portugal.

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Offizielle URL: http://in3.dem.ist.utl.pt/lxlaser2004

Kurzfassung

The study is concerned with the analysis of the turbulent flow detached from an unswept wing at large angles of attack. The transition regime between subcritical and supercritical separation, which is well known to delimit the low Reynolds number regime, is in the focus of the investigation. The coherent structures that develop with trailing edge separation are extracted from Particle Image Velocimetry (PIV) data by means of Proper Orthogonal Decomposition (POD). Thus, the three-dimensionality of the flow in terms of spanwise morphology is studied, and a reduced representation by (geometrical) symmetry plane investigation turns out to be justified. Additionally, fluctuations of the flow velocity and the wall pressure exhibit an interval of characteristic, preferred length scales of the vortical structures. The decomposition of both the separation scenarios, inspecting the suction side of the wing and the near wake flow, yields to a qualitative identification of the large-scale structure. Moreover, POD dissects the vortical motion according to the energy contained in the various modes, and thus with respect to the respective impact on flow dynamics. These insights into coherent structures, and the characterization of their dynamics is beneficial particularly to the basic validation of Large Eddy Simulations (LES) of such complex flows.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Coherent Structures in Critical Wing Flows
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kreplin, Hans-PeterNICHT SPEZIFIZIERT
Kindler, KoljaNICHT SPEZIFIZIERT
Ronneberger, DirkUni Göttingen
Datum:2004
Status:veröffentlicht
Stichwörter:airfoil, separation, coherent structures, PIV, POD
Veranstaltungstitel:12th International Symposium „Application of laser techniques to fluid mechanics“
Veranstaltungsort:Lissabon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-07-12 - 2004-07-15
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L -- keine Zuordnung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hubschrauber
Hinterlegt von: Elisabeth Senger
Hinterlegt am:15 Feb 2006
Letzte Änderung:27 Apr 2009 05:00

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