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3D Lagrangian Particle Tracking within transitional flows

Schanz, Daniel and Geisler, Reinhard and Leclaire, Benjamin and Pruvost, Jacques and Agocs, Janos and Ewald, Selina and Schröder, Andreas (2023) 3D Lagrangian Particle Tracking within transitional flows. In: Proceedings of the 15th International Symposium on Particle Image Velocimetry (179), pp. 1-2. SCSU San Diego State University. 15th International Symposium on Particle Image Velocimetry - ISPIV 2023, 19.-21. June 2023, San Diego, CA, USA.

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Official URL: http://hdl.handle.net/20.500.12680/wd3763760


The development and production of laminar flow wings is one important goal in Europe’s challenges to significantly reduce the fuel burn and the emission of future transport aircraft. For the aerodynamic design of laminar flow wings (NLF or HLFC), the understanding of the boundary layer transition process is essential and the further improvement of numerical prediction tools is necessary. While the transition over smooth surfaces is nowadays well understood, the understanding of the effect of surface imperfections on the laminar boundary layer is still vague. Both the effect of roughness (e.g. due to small rivet heads or insects) and the effect of surface steps (e.g. between two adjacent wing panels) are important. Two different types of imperfections were studied by 3D Lagrangian Particle Tracking (LPT) experiments, using similar setups. On the one hand, the transitional flow developing downstream of a backward facing step (BFS) of height ℎ 5 mm at several Reynolds numbers (Re_h~ 850 - 4.150) was investigated. On the other hand, the BFS was replaced by of a small cube (1.5 mm sides). In both cases, the incoming boundary layer was kept laminar, such that a transition occurs in the wake of the step and the cube. It is known that the flow around these imperfections depends on various parameters such as the dimension ratios L/ℎ, delta/ℎ and theta/ℎ, the Reynolds number, the free stream turbulence and its specific spectral distribution, etc. The transition of the boundary layer can be caused downstream due to the growth of Tollmien-Schlichting-waves in two-dimensional boundary layers or, in addition, by crossflow instabilities in three-dimensional boundary layers. The investigation of the development of disturbances due to instabilities requires the measurement of highly resolved velocity fields both in space and in time and, preferably, the skin friction distribution on the surface. For a related publication, see (Schröder et al. 2020).

Item URL in elib:https://elib.dlr.de/196272/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://piv.sdsu.edu/, https://scholarworks.calstate.edu/collections/bg257p13m?utf8=%E2%9C%93&cq=Schanz&sort=; https://scholarworks.calstate.edu/downloads/rr172457n
Title:3D Lagrangian Particle Tracking within transitional flows
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schanz, DanielUNSPECIFIEDhttps://orcid.org/0000-0003-1400-4224UNSPECIFIED
Geisler, ReinhardUNSPECIFIEDhttps://orcid.org/0009-0006-8838-3713UNSPECIFIED
Schröder, AndreasUNSPECIFIEDhttps://orcid.org/0000-0002-6971-9262140149387
Date:June 2023
Journal or Publication Title:Proceedings of the 15th International Symposium on Particle Image Velocimetry
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 1-2
Publisher:SCSU San Diego State University
Series Name:Conference Proceedings
Keywords:Lagrangian Particle Tracking, Data assimilation, BFS, surface cube, Transition
Event Title:15th International Symposium on Particle Image Velocimetry - ISPIV 2023
Event Location:San Diego, CA, USA
Event Type:international Conference
Event Dates:19.-21. June 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 - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:09 Aug 2023 13:56
Last Modified:09 Aug 2023 13:56

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