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Analysis of dynamic stall using dynamic mode decomposition technique

Mariappan, Sathesh and Gardner, Anthony Donald and Richter, Kai and Raffel, Markus (2013) Analysis of dynamic stall using dynamic mode decomposition technique. 31st AIAA Applied Aerodynamics Conference, 24. - 27. Juni 2013, San Diego, USA.

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Official URL: http://arc.aiaa.org/doi/abs/10.2514/6.2013-3040


Dynamic mode decomposition (DMD) is applied to investigate the unsteady flow field around a pitching airfoil. The extracted flow structures are termed as DMD modes. Analyses are performed for both attached flow and dynamic stall cases. Initially flow field data generated from numerical simulations are investigated. The effect of exclusion of the flow field near the surface of the airfoil on the structure of the DMD modes is examined. This is of vital importance for the experimental measurements, as the flow field near the airfoil's surface is difficult to measure using particle image velocimetry. In the latter part of the paper, DMD modes extracted from the experimental data are analyzed. The structure of the DMD modes are compared with the modes obtained from the proper orthogonal decomposition (POD) technique. A lower order model is constructed from few DMD modes and compared with a model obtained using POD modes. Both techniques capture the overall dynamics of the flow field during dynamic stall. Finally, effects of phase averaging and insufficient measurement time on the modes are discussed.

Item URL in elib:https://elib.dlr.de/83899/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of dynamic stall using dynamic mode decomposition technique
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Gardner, Anthony Donaldtony.gardner (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-22
Series Name:Conference Proceedings online
Keywords:Dynamic stall, dynamic mode decomposition, lower order model, PIV
Event Title:31st AIAA Applied Aerodynamics Conference
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:24. - 27. Juni 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Virtual Aerodynamic Rotorcraft (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Micknaus, Ilka
Deposited On:21 Aug 2013 08:11
Last Modified:07 Oct 2014 09:30

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