elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Global Field Invariants and Local Vortex Axis Invariants Analysis for Flow Prediction.

Rütten, Markus (2007) Global Field Invariants and Local Vortex Axis Invariants Analysis for Flow Prediction.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

Flow prediction is the ultimative task of each aerodynamicist. The knowledge about the flow structure, in particular it’s vortical structures and their temporal development would allow to design more efficient technical applications or flow control systems. The goal of this paper is to analyze the global flow field and the flow along local vortex axes by applying topological criteria with the objective to get more information about the structural stability of the flow field for flow prediction. The analysis is performed on a numerical calculated dataset of a pitching delta wing flow. In the global field approach vortical flow regions are detected, whereas the invariants of the involved vector fields are analyzed and visualized. The topological flow structure change is shown by temporal development of the invariants in relation to the evolution of the dominant vortices. For the local flow topological analysis, vortex axis identification and calculation methods have been utilized to destinate the vortex axes of the dominant vortices. Here, a new vortex axis detection scheme has been applied. A local analysis of the flow field invariants on the vortex axes allows us to visualize their development in time. The resulting curves in the phase space of tensor invariants embody stability information that indicates changes of topological flow structures. The analysis of these phase space curves can be used as a prediction methodology for topological flow structure change. In a further step surfaces of invariants of the vorticity vector field are presented in relation to the development of the velocity field. This gives significant insight into the development of the vortex breakdown phenomenon and reveals the interdependency of different vector fields. This can serve as a fundamental building block in methods for controlling flow structures.

Dokumentart:Tagungsband
Titel:Global Field Invariants and Local Vortex Axis Invariants Analysis for Flow Prediction.
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Rütten, MarkusNICHT SPEZIFIZIERT
Datum:22 Mai 2007
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:delta wing, vortical flow structures, flow topology
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 - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hubschrauber
Hinterlegt von: Dr.-Ing. Markus Rütten
Hinterlegt am:15 Mai 2008
Letzte Änderung:15 Jan 2010 00:27

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.