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Shake-The-Box particle tracking with variable time-steps in flows with high velocity range (VT-STB)

Schanz, Daniel und Novara, Matteo und Schröder, Andreas (2021) Shake-The-Box particle tracking with variable time-steps in flows with high velocity range (VT-STB). In: Proceedings of 14th International Symposium on Particle Image Velocimetry, 1 (1), 1 - 11. ILLINOIS Tech / Paul V. Galvin Library. 14th International Symposium on Particle Image Velocimetry 2021, 01.-04.08.2021, Chicago, USA (online). doi: 10.18409/ispiv.v1i1.65.

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Offizielle URL: https://doi.org/10.18409/ispiv.v1i1.65

Kurzfassung

In recent years, Lagrangian Particle Tracking (LPT) has become more and more important in the field of 3D flow measurements, largely due to the introduction of the methods of Iterative Particle Reconstruction (IPR, Wieneke 2013) and Shake-The-Box (STB, Schanz et al. 2016). Applying the STB algorithm, particles can be tracked in large numbers, with a nearly complete suppression of ghost particles. The ability of the STB algorithm to discern real particles from ghost particles is largely stemming from the observation that for real particles the change of acceleration is small between time-steps, while ghost particles are generated in quasi-random locations all over the measurement volume. However, this assumption only holds if the particles exhibit a certain amount of movement relative to each other, such that the ambiguities ‘de-correlate’ within few time-steps. However, flows with a high velocity range can exhibit regions in space with only very little movement of the particles (e.g. jet flows). As the time separation has to be chosen such that the fastest particles are reliably tracked, particles in the surrounding flow might move only a fraction of a pixel in the same time. Another potentially problematic effect of slowly moving particle clouds is that situations of overlapping particle images are retained over several time-steps. In this work we propose an extension to the standard STB evaluation, which applies multiple iterations of particle tracking with variable time-separation Δ. The idea is to start the evaluation with a Δ at iteration 1 such that the slowest particles of the flow can be optimally tracked. From there, the time-separation is iteratively reduced, tracking faster particles with every iteration. Finally, the original time-separation of the recording is reached, where only the fastest particles - remain to be tracked.

elib-URL des Eintrags:https://elib.dlr.de/143961/
Dokumentart:Konferenzbeitrag (Vortrag)
Zusätzliche Informationen:https://doi.org/10.18409/ispiv.v1i1, https://www.iit.edu/ispiv2021, Paper 125
Titel:Shake-The-Box particle tracking with variable time-steps in flows with high velocity range (VT-STB)
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Schanz, Danieldaniel.schanz (at) dlr.dehttps://orcid.org/0000-0003-1400-4224NICHT SPEZIFIZIERT
Novara, MatteoMatteo.Novara (at) dlr.dehttps://orcid.org/0000-0002-8975-0419NICHT SPEZIFIZIERT
Schröder, AndreasAndreas.Schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262NICHT SPEZIFIZIERT
Datum:August 2021
Erschienen in:Proceedings of 14th International Symposium on Particle Image Velocimetry
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:1
DOI:10.18409/ispiv.v1i1.65
Seitenbereich:1 - 11
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der HerausgeberHerausgeber-ORCID-iDORCID Put Code
Christensen, Kenneth T.Kenneth.Christensen (at) iit.eduNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Verlag:ILLINOIS Tech / Paul V. Galvin Library
Name der Reihe:Conference Proceedings
Status:veröffentlicht
Stichwörter:variable time-steps, Shake-The-Box, Lagrangian Particle Tracking, Particle Image Cluster (PIC)
Veranstaltungstitel:14th International Symposium on Particle Image Velocimetry 2021
Veranstaltungsort:Chicago, USA (online)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:01.-04.08.2021
Veranstalter :Illinois Institute of Technology
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Effizientes Luftfahrzeug
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L EV - Effizientes Luftfahrzeug
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Flugzeug und Validierung
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:06 Jan 2022 16:31
Letzte Änderung:06 Jan 2022 16:31

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