Mommert, Michael und Bahavar, Philipp und Barta, Robin und Bauer, Christian und Volk, Marie-Christine und Wagner, Claus (2025) Curvature-based energy spectra revealing flow regime changes in Rayleigh-Bénard convection. European Journal of Mechanics B-Fluids, 114 (204343), Seiten 1-14. Elsevier. doi: 10.1016/j.euromechflu.2025.204343. ISSN 0997-7546.
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Offizielle URL: https://www.sciencedirect.com/science/article/pii/S0997754625001244
Kurzfassung
We use the local curvature derived from velocity vector fields or particle tracks as a surrogate for structure size to compute curvature-based energy spectra. An application to homogeneous isotropic turbulence shows that these spectra replicate certain features of classical energy spectra such as the slope of the inertial range extending towards the equivalent curvature of the Taylor microscale. As this curvature-based analysis framework is sampling based, it also allows further statistical analyses of the time evolution of the kinetic energies and curvatures considered. The main findings of these analyses are that the slope for the inertial range also appears as a salient point in the probability density distribution of the angle of the vector comprising the two time evolution components. This density distribution further exhibits changing features of its shape depending on the Rayleigh number. This Rayleigh number evolution allows to observe a change in the flow regime between the Rayleigh numbers and . Insight into this regime change is gathered by conditionally sampling the salient time evolution behaviours and projecting them back into physical space. Concretely, the regime change is manifested by a change in the spatial distribution for the different time evolution behaviours. Finally, we show that this analysis can be applied to measured Lagrangian particle tracks.
elib-URL des Eintrags: | https://elib.dlr.de/213463/ | ||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||
Titel: | Curvature-based energy spectra revealing flow regime changes in Rayleigh-Bénard convection | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | 21 August 2025 | ||||||||||||||||||||||||||||
Erschienen in: | European Journal of Mechanics B-Fluids | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||
Band: | 114 | ||||||||||||||||||||||||||||
DOI: | 10.1016/j.euromechflu.2025.204343 | ||||||||||||||||||||||||||||
Seitenbereich: | Seiten 1-14 | ||||||||||||||||||||||||||||
Herausgeber: |
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Verlag: | Elsevier | ||||||||||||||||||||||||||||
Name der Reihe: | Science Direct | ||||||||||||||||||||||||||||
ISSN: | 0997-7546 | ||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||
Stichwörter: | Rayleigh-Bénard convection, energy spectrum, turbulent energy | ||||||||||||||||||||||||||||
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: | Mommert, Michael | ||||||||||||||||||||||||||||
Hinterlegt am: | 19 Sep 2025 09:00 | ||||||||||||||||||||||||||||
Letzte Änderung: | 19 Sep 2025 09:00 |
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