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Measuring Lagrangian particle tracks in densely seeded wall bounded turbulent flows using 4D-PTV “Shake-the-box”

Schröder, Andreas und Schanz, Daniel (2014) Measuring Lagrangian particle tracks in densely seeded wall bounded turbulent flows using 4D-PTV “Shake-the-box”. WALLTURB Workshop: Progress in Wall Turbulence: Understanding and modelling, 2014-06-18 - 2014-06-20, Lille, France.

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Offizielle URL: http://lmlm6-62.univ-lille1.fr/Wallturb_Workshop/index.html

Kurzfassung

Turbulent wall bounded flows at aerodynamically relevant Reynolds numbers consist of manifold temporal and spatial scales and are essentially characterized by the self-organization and dynamics of coherent flow structures. The latter ones can be regarded as energy containing structures such as hairpin-like vortices and spanwise alternating wall bounded low- and high-speed streaks, which have been observed and extensively analysed in the past with both advanced experimental (e.g. PIV) and numerical methods (e.g. DNS). In many studies the role of coherent structures for the wall normal and spanwise fluid exchange has been highlighted mostly within an Eulerian frame of reference. In the present work the time series of already existing particle images achieved during two different applications of time-resolved tomographic PIV to wall bounded flows will be reprocessed applying the novel 4D-PTV algorithm “Shake-the-box” (STB) developed at DLR Göttingen. The series of 3D velocity vector data from conventional tomographic MART reconstructions and related correlation-based evaluation techniques will be compared to results of the STB algorithm for a) the flat plate turbulent boundary layer flow in a water tunnel at Re ~ 2460 and b) the turbulent flow in the shear layer region downstream of the 7th hill of the ERCOFTAC test case Nr. 81 in the “Periodic hill” water tunnel at TU Munich at Re = 33,000 gained during the EC project AFDAR. The advantages of the STB results compared to Tomo PIV will be highlighted in terms of accuracy, ghost-level, spatial resolution and the possibility to switch between the Eulerian and Lagrangian frame of reference. In the same sense these advantages and further potential benefits of the STB will be discussed for serving as a 4D measurement tool for characterizing wall bounded turbulence in future projects.

elib-URL des Eintrags:https://elib.dlr.de/88115/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Measuring Lagrangian particle tracks in densely seeded wall bounded turbulent flows using 4D-PTV “Shake-the-box”
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262NICHT SPEZIFIZIERT
Schanz, Danieldaniel.schanz (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seite 39
Name der Reihe:Book of Abstracts
Status:veröffentlicht
Stichwörter:4D-PTV, Lagrangian, Wall Turbulence
Veranstaltungstitel:WALLTURB Workshop: Progress in Wall Turbulence: Understanding and modelling
Veranstaltungsort:Lille, France
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:18 Juni 2014
Veranstaltungsende:20 Juni 2014
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Simulation und Validierung (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:06 Nov 2014 09:18
Letzte Änderung:24 Apr 2024 19:54

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