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Dynamics of a strake vortex interaction with the turbulent boundary layer of a two-element airfoil

Rathje, Nils and Ströer, Philip and Weiner, Andre and Knopp, Tobias and Radespiel, Rolf (2023) Dynamics of a strake vortex interaction with the turbulent boundary layer of a two-element airfoil. In: AIAA Aviation 2023 Forum, pp. 1-14. American Institute of Aeronautics and Astronautics. AIAA Aviation Forum 2023, 12.-16. Jun. 2023, San Diego, USA. doi: 10.2514/6.2023-4438.

Full text not available from this repository.

Official URL: https://arc.aiaa.org/doi/abs/10.2514/6.2023-4438


This paper deals with the interaction of a generic strake vortex with the turbulent boundary layer of a two-element airfoil. For this, an angle of attack study of the two-element airfoil as well as a displacement of the height of the vortex generator relative to the airfoil is experimentally investigated. In order to resolve the vortex dynamics, a time-resolved Stereo-PIV campaign is conducted within the subsonic wind tunnel of the Technical University Braunschweig at a Reynolds number of Re ≈ 2 Mio, based on the retracted chord of the airfoil. The underlying vortex dynamics are investigated by means of a vortex core tracking from the PIV plane. Additionally, a proper orthogonal decomposition (POD) and a high-order dynamic mode decomposition (HODMD) are applied as a modal analysis. The POD produces the well established dipole structures for the longitudinal vortex, which are associated with a coherent vortex movement. Within the analysis, equivalent structures are found within the HODMD results. In contrast to the isolated strake vortex configuration, the spectrum of the modes and the top modes are shifted towards lower frequencies. Additionally, a circular motion of the HODMD modes is established to be the source of the lateral or vertical displacement observed within the vortex meandering.

Item URL in elib:https://elib.dlr.de/195442/
Document Type:Conference or Workshop Item (Speech)
Title:Dynamics of a strake vortex interaction with the turbulent boundary layer of a two-element airfoil
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Knopp, TobiasUNSPECIFIEDhttps://orcid.org/0000-0002-3161-5353UNSPECIFIED
Date:9 June 2023
Journal or Publication Title:AIAA Aviation 2023 Forum
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-14
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:American Institute of Aeronautics and Astronautics
Series Name:AIAA AVIATION 2023 Forum
Keywords:Longitudinal Vortex Dynamics, Strake Vortex, Vortex Wandering, Vortex Meandering, Turbulent Boundary Layer Vortex Interaction, POD, DMD, HODMD, Delta Wing, PIV
Event Title:AIAA Aviation Forum 2023
Event Location:San Diego, USA
Event Type:international Conference
Event Dates:12.-16. Jun. 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > CASE, GO
Deposited By: Ströer, Philip
Deposited On:27 Jul 2023 13:50
Last Modified:23 Aug 2023 13:50

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