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Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB)

Schröder, Andreas und Schanz, Daniel und Gesemann, Sebastian und Novara, Matteo und Huhn, Florian (2015) Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB). WORKSHOP on Wall Turbulence and Advanced Measurement Techniques, 2015-05-18, Lille, France.

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Kurzfassung

For all PIV based approaches the spatial resolution of the local instantaneous velocity measurement is limited by the correlation window size (and the light-sheet thickness), which acts as a low-pass filter biasing the measurement in presence of strong velocity gradients. Further basic limitations of PIV are the low dynamic velocity range (DVR) which is typically in the order of 1:100 and the dynamic spatial range (DSR), which is basically limited by the resolution of the used camera sensor (and the correlation window size). Several methods have been developed in order to overcome these limitations (image deformation and variational approaches); but only particle-tracking (PTV) have been found capable of delivering reliable results for the mean flow statistics in strong-shear flow or near interfaces and walls. While the full Reynolds stress tensor in such flows is only achievable by long-term statistics of3D-PTV, 4D-PTV „Shake-The-Box“ and FlowFit enables experimental investigations of flow velocities and topologies in time and space as well as global and local statistics by spatially high-resolved volumes in an Eulerian- and a Lagrangian- reference frame at the same time. The principle of „Shake-The-Box“(STB) and the difference between Eulerian and Lagrangian frames of reference are explained briefly. Results of STB measurements in the Periodic Hill (ERCOFTAC Test Case 81) flow and of a Large-Scale Thermal Plume using Helium-Filled-Soap- Bubbles (HFSB) are presented. Both experimental investigations demonstrate the advantages of STB for gaining high velocity estimation accuracies at high seeding densities without spatial filtering and bias errors.

elib-URL des Eintrags:https://elib.dlr.de/96422/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Turbulent shear flow investigations using 4D-PTV “Shake-The-Box” (STB)
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Schanz, Danieldaniel.schanz (at) dlr.de
Gesemann, Sebastiansebastian.gesemann (at) dlr.de
Novara, Matteomatteo.novara (at) dlr.de
Huhn, Florianflorian.huhn (at) dlr.de
Datum:2015
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:PTV, Turbulent shear flow, Periodic Hill, Shake-The-Box, Helium-Filled-Soap-Bubbles
Veranstaltungstitel:WORKSHOP on Wall Turbulence and Advanced Measurement Techniques
Veranstaltungsort:Lille, France
Veranstaltungsart:Workshop
Veranstaltungsdatum:18 Mai 2015
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:16 Jun 2015 10:54
Letzte Änderung:24 Apr 2024 20:02

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