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Improved CFD Predictions for High Lift Flows in the European Project EUROLIFT II

Eliasson, Peter und Catalano, Pietro und Le Pape, Marie-Claire und Ortmann, Judith und Pelizzari, Emilio und Ponsin, Jorge (2007) Improved CFD Predictions for High Lift Flows in the European Project EUROLIFT II. In: AIAA-2007-4303. 25th AIAA Applied Aerodynamics Conference, 2007-06-25 - 2007-06-28, Miami, Florida (USA).

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Offizielle URL: http://www.aiaa.com

Kurzfassung

In the framework of the European High Lift Programme EUROLIFT II the numerical and experimental validation of high lift configurations initiated in EUROLIFT are being pursued. This present contribution describes a summary of the CFD improvements carried out in this project. The improvements cover turbulence modeling and grid generation. More sophisticated turbulence models beyond the eddy viscosity concept are evaluated as well as unsteady effects and efficiency enhancement through wall function approaches. Different techniques to reduce the number of nodes in unstructured grids have been implemented in partners grid generators, mainly through the stretching of elements and introduction of hexahedral elements. The overlapping grid technique for high lift flows are demonstrated as well. Efficiency enhancement through wall functions show that the cost can be reduced to about 50% or more. The computed results agree well with results from near wall resolved grids in the linear range but the maximum lift is over-predicted. Explicit algebraic Reynolds stress models as well as full differential Reynolds stress models improve the predictions in the maximum lift region compared to standard eddy viscosity models. Introducing stretching of unstructured grids along leading and trailing edges as well as introducing hexahedral elements can substantially reduce the number of grid nodes while maintaining the solution accuracy. Overlapping grid techniques for high lift flows show good results but some grid dependencies are observed.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Improved CFD Predictions for High Lift Flows in the European Project EUROLIFT II
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Eliasson, PeterFOI, Swedish Defence Research Agency, SE164 90, Stockholm, Sweden
Catalano, PietroCira, via Maiorise, 81043 Capua, Italy
Le Pape, Marie-ClaireOnera, BP 72, 92322 Chatillon CEDEX, France
Ortmann, JudithNICHT SPEZIFIZIERT
Pelizzari, EmilioAlenia Aeronautica S.p.A., Corso Marche 41, 10146 Torino, Italy
Ponsin, JorgeINTA, Torrejon de Ardoz, Madrid, 28850, Spain
Datum:Juni 2007
Erschienen in:AIAA-2007-4303
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:EUROLIFT II, CFD Prediction, turbulence model, stretching of unstructured grid, unstructured grid with hexahedral elements
Veranstaltungstitel:25th AIAA Applied Aerodynamics Conference
Veranstaltungsort:Miami, Florida (USA)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-06-25 - 2007-06-28
Veranstalter :AIAA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L - keine Zuordnung
DLR - Teilgebiet (Projekt, Vorhaben):L -- keine Zuordnung
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Konfigurativer Entwurf
Hinterlegt von: Judith Geyr von Schweppenburg
Hinterlegt am:28 Jun 2007
Letzte Änderung:27 Apr 2009 13:53

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