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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 (2014) Analysis of Dynamic Stall Using Dynamic Mode Decomposition Technique. AIAA Journal, 52 (11), pp. 2427-2439. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J052858. ISSN 0001-1452.

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Official URL: http://arc.aiaa.org/doi/pdf/10.2514/1.J052858


Dynamic mode decomposition is applied to investigate the unsteady flowfield around a pitching airfoil. The extracted flow structures are termed as dynamic mode decomposition modes. Analyses are performed for both attached flow and dynamic stall cases. Initially, flowfield data generated from numerical simulations are investigated. The effect of exclusion of the flowfield near the surface of the airfoil on the structure of the dynamic mode decomposition modes is examined. This is of vital importance for the experimental measurements, as the flowfield near the airfoil’s surface is difficult to measure using particle image velocimetry. In the latter part of the paper, dynamicmode decomposition modes extracted from the experimental data are analyzed. The structure of these modes are compared with the modes obtained from the proper orthogonal decomposition technique. Finally, effects of phase averaging on the modes are discussed.

Item URL in elib:https://elib.dlr.de/83402/
Document Type:Article
Title:Analysis of Dynamic Stall Using Dynamic Mode Decomposition Technique
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Mariappan, SatheshDepartment of Aerospace Engineering, Indian Institute of Technology Kanpur, Kanpur, IndiaUNSPECIFIED
Gardner, Anthony Donaldtony.gardner (at) dlr.deUNSPECIFIED
Richter, Kaikai.richter (at) dlr.deUNSPECIFIED
Raffel, Markusmarkus.raffel (at) dlr.deUNSPECIFIED
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.J052858
Page Range:pp. 2427-2439
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:Dynamic Stall, Dynamic Mode Decomposition, PIV, helicopter rotor blades, lower order model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:rotorcraft
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:23 Oct 2014 16:00
Last Modified:08 Mar 2018 18:42

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