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Bi-stability Detection in the Flow Around a Sphere by Means of Experiments and Lattice Boltzmann Simulations

Bauer, Christian and Müller, Max and Ehrenfried, Klaus and Wagner, Claus (2021) Bi-stability Detection in the Flow Around a Sphere by Means of Experiments and Lattice Boltzmann Simulations. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII, 151, pp. 441-450. Springer Nature. 22. STAB/DGLR Symposium 2020, 2020-07-15, Göttingen, Deutschland. doi: 10.1007/978-3-030-79561-0_42. ISBN 978-3-030-79560-3. ISSN 1612-2909.

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Official URL: https://link.springer.com/book/10.1007/978-3-030-79561-0#editorsandaffiliations

Abstract

With the aim to detect bi-stability in the highly separated flow around a sphere mounted on a cross-stream rod, wind tunnel measurements and numerical simulations with a Lattice Boltzmann method (LBM) are performed and compared. In both, LBM simulation and experiment, a bi-stable flow behaviour is detected at a Reynolds number of Re=105 based on the sphere diameter, the inflow velocity and the kinematic viscosity, whereas such behaviour is absent at Reynolds numbers as high as Re=3×105. The bi-stable behaviour detected in the time series of the aerodynamic side force acting on the sphere for Re=105 is reflected by a bi-modal probability density function. For Re=3×105, on the contrary, the probability density function is nearly Gaussian. Further, in agreement with the experiment, two counter-rotating vortex tubes originating from the intersection of the leeward and cross-stream rod-ward side of the sphere are generated.

Item URL in elib:https://elib.dlr.de/136382/
Document Type:Conference or Workshop Item (Other)
Additional Information:Hardcover ISBN 978-3-030-79560-3 Softcover ISBN 978-3-030-79563-4 eBook ISBN 978-3-030-79561-0 Series ISSN 1612-2909 Series E-ISSN 1860-0824
Title:Bi-stability Detection in the Flow Around a Sphere by Means of Experiments and Lattice Boltzmann Simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bauer, ChristianUNSPECIFIEDhttps://orcid.org/0000-0003-1838-6194UNSPECIFIED
Müller, MaxUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ehrenfried, KlausUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:14 July 2021
Journal or Publication Title:22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:151
DOI:10.1007/978-3-030-79561-0_42
Page Range:pp. 441-450
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Dillmann, AndreasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heller, GerdAirbusUNSPECIFIEDUNSPECIFIED
Krämer, EwaldInstitut für Aerodynamik und Gasdynamik, Universität StuttgartUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-030-79560-3
Status:Published
Keywords:Lattice Boltzmann Method, Unsteady Aerodynamics
Event Title:22. STAB/DGLR Symposium 2020
Event Location:Göttingen, Deutschland
Event Type:international Conference
Event Date:15 July 2020
Organizer:STAB/DGLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bauer, Christian
Deposited On:09 Dec 2020 10:30
Last Modified:24 Apr 2024 20:38

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