Müller, Max und Ehrenfried, Klaus und Wagner, Claus (2024) Low-Order Modeling of Bistable Side Forces on a Sphere Measured for a Transient Inflow in a Wind Tunnel. In: 23rd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIV, 154, Seiten 88-98. Springer Nature. 23. STAB-DGLR-Symposium 2022, 2022-11-09 - 2022-11-10, Berlin, Deutschland. doi: 10.1007/978-3-031-40482-5_9. ISBN 978-3-031-40481-8. ISSN 1612-2909.
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Offizielle URL: https://link.springer.com/book/10.1007/978-3-031-40482-5
Kurzfassung
The unsteady forces acting on a sphere laterally mounted in a wind tunnel with transient sinusoidal inflow are investigated. The study shows that the low-frequency dynamic is characterized by a spontaneous switching between two partially stable states, also known as bistability. Additionally, oscillatory forces exist, which, on the one hand, are induced by the sinusoidal transient inflow and, on the other hand, originate from natural vortex shedding. By separating the bistability and the oscillatory forces using proper orthogonal decomposition, a low-order model based on the Duffing equation is developed both for the bistability and the oscillatory multi-scale induced forces. The bistability is represented by a chaotic bistable Duffing equation, whose parameters are determined by manual adjustment. In contrast, the parameters of the oscillatory multi-scale forcing are determined by expanding the forcing of the Duffing equation to three terms and preserving the phase angles between the three characteristic frequencies, the flapping frequency, its multiples and the natural vortex shedding.
elib-URL des Eintrags: | https://elib.dlr.de/192021/ | ||||||||||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||
Zusätzliche Informationen: | ISSN 1612-2909 ISSN 1860-0824 (electronic) ISBN 978-3-031-40481-8 ISBN 978-3-031-40482-5 (eBook) | ||||||||||||||||||||||||
Titel: | Low-Order Modeling of Bistable Side Forces on a Sphere Measured for a Transient Inflow in a Wind Tunnel | ||||||||||||||||||||||||
Autoren: |
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Datum: | 2024 | ||||||||||||||||||||||||
Erschienen in: | 23rd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIV | ||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||
Band: | 154 | ||||||||||||||||||||||||
DOI: | 10.1007/978-3-031-40482-5_9 | ||||||||||||||||||||||||
Seitenbereich: | Seiten 88-98 | ||||||||||||||||||||||||
Herausgeber: |
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Verlag: | Springer Nature | ||||||||||||||||||||||||
Name der Reihe: | Notes on Numerical Fluid Mechanics and Multidisciplinary Design | ||||||||||||||||||||||||
ISSN: | 1612-2909 | ||||||||||||||||||||||||
ISBN: | 978-3-031-40481-8 | ||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||
Stichwörter: | Duffing, low-order modeling, bistability, Reduced-order Model, Chaos | ||||||||||||||||||||||||
Veranstaltungstitel: | 23. STAB-DGLR-Symposium 2022 | ||||||||||||||||||||||||
Veranstaltungsort: | Berlin, Deutschland | ||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||
Veranstaltungsbeginn: | 9 November 2022 | ||||||||||||||||||||||||
Veranstaltungsende: | 10 November 2022 | ||||||||||||||||||||||||
Veranstalter : | STAB/DGLR | ||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||
HGF - Programm: | Verkehr | ||||||||||||||||||||||||
HGF - Programmthema: | Schienenverkehr | ||||||||||||||||||||||||
DLR - Schwerpunkt: | Verkehr | ||||||||||||||||||||||||
DLR - Forschungsgebiet: | V SC Schienenverkehr | ||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | V - RoSto - Rolling Stock | ||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Bodengebundene Fahrzeuge | ||||||||||||||||||||||||
Hinterlegt von: | Müller, Max | ||||||||||||||||||||||||
Hinterlegt am: | 16 Dez 2022 13:31 | ||||||||||||||||||||||||
Letzte Änderung: | 31 Jul 2024 17:55 |
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