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Comparison of two unstable flow states in turbulent mixed convection

Niehaus, Konstantin A and Mommert, Michael and Schiepel, Daniel and Schmeling, Daniel and Wagner, Claus (2020) Comparison of two unstable flow states in turbulent mixed convection. In: 21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics, 142, pp. 543-552. Springer Nature. 21. STAB/DGLR Symposium 2018, 6.-7. Nov. 2018, Darmstadt, Deutschland. doi: 10.1007/978-3-030-25253-3_52. ISBN 978-3-030-25252-6. ISSN 1612-2909.

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Official URL: https://doi.org/10.1007/978-3-030-25253-3_52


We present an experimental study focusing on the large- and small-scale structures in turbulent mixed convection. Measurements are conducted at stable conditions and during a reconfiguration event using temperature probes and triggered stereoscopic particle image velocimetry. It is found that the amplitude of the temperature distribution is higher for a state with three Large-Scale Circulations (LSC) than for a state with four LSCs. Furthermore, a correlation analysis of velocity fields measured during a reconfiguration process reveals the change of the dominant LSC mode. However, the mean spatial power distribution computed via a fast Fourier transformation reflects no changes in small-scale flow structures.

Item URL in elib:https://elib.dlr.de/120454/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Print ISBN 978-3-030-25252-6 Online ISBN 978-3-030-25253-3 ISSN-electronic 1860-0824
Title:Comparison of two unstable flow states in turbulent mixed convection
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Niehaus, Konstantin AKonstantin.Niehaus (at) dlr.deUNSPECIFIED
Mommert, MichaelMichael.Mommert (at) dlr.dehttps://orcid.org/0000-0002-7817-3388
Schiepel, Danieldaniel.schiepel (at) dlr.dehttps://orcid.org/0000-0002-3703-3514
Schmeling, DanielDaniel.Schmeling (at) dlr.dehttps://orcid.org/0000-0003-2712-9974
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Journal or Publication Title:21st STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
DOI :10.1007/978-3-030-25253-3_52
Page Range:pp. 543-552
EditorsEmailEditor's ORCID iD
Dillmann, Andreasandreas.dillmann@dlr.deUNSPECIFIED
Heller, GerdAirbus BremenUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik Universität StuttgartUNSPECIFIED
Wagner, ClausClaus.Wagner@DLR.deUNSPECIFIED
Tropea, CameronFachgebiet Strömungslehre und Aerodynamik, TU DarmstadtUNSPECIFIED
Jakirlic, SuadTU DarmstadtUNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Keywords:mixed convection, generic passenger cabin ventilation, rayleigh-bernard convection, Stereo PIV, flow reconfiguration
Event Title:21. STAB/DGLR Symposium 2018
Event Location:Darmstadt, Deutschland
Event Type:international Conference
Event Dates:6.-7. Nov. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Niehaus, Konstantin A
Deposited On:04 Dec 2018 12:15
Last Modified:18 Jun 2020 09:49

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