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On the Coverage of Dynamic Processes in Highly Separated Flows Using the Lattice Boltzmann Method

Bauer, Christian and Müller, Max and Ehrenfried, Klaus and Wagner, Claus (2020) On the Coverage of Dynamic Processes in Highly Separated Flows Using the Lattice Boltzmann Method. In: 22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII - Jahresbericht 2020, pp. 110-111. Springer Nature. 22. STAB/DGLR Symposium 2020, 15. Juli 2020, Göttingen, Deutschland.

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Official URL: https://www.dlr.de/as/de/Portaldata/5/Resources/dokumente/veranstaltungen/stab_workshop/STAB-Jahresbericht-2020.pdf

Abstract

Ground vehicles are exposed to a vast variety of unsteady aerodynamic phenomena such as gusts. This is why the effect of gusts has been the focus of many studies, e.g. on cars in full scale (Schroeck et al., 2011), trains in full scale (Baker et al., 2004) as well as on simplified car models in wind tunnels (Ferrand, 2014). In order to gain better insight into the flow dynamics, Hemida and Krajnovic (2010) investigated the effect of ´cross winds on a generic train with different nose shapes using large-eddy simulations. Another unsteady effect that has recently gained interest is the multi-stability of the wake behind cars. In this context, Cadot et al. (2016) detected bi-stability in the lift forces acting on full-scale cars during wind tunnel testing. This bi-stability was further investigated in wind tunnel testing on simplified car models by Grandemange et al. (2013) and Pavia et al. (2018). Due to the highly transient behaviour of the flow, the existing numerical methods require revision concerning their capability of coping with the flow dynamics. For such investigations, the flow around a sphere is usually chosen as a setup, as it has been in the focus of aerodynamic research since the very beginning (Prandtl, 1914) and, thus, is the subject of many studies described in the literature. However, the flow around a sphere is an example of a fully separated flow, whose prediction poses a challenge to numerical investigations such as the DES study of Constantinescu and Squires (2004). The highly instationary dynamics in the wake of such a flow are described by hot-wire measurements (Achenbach, 1972) as well as by flow visualisation (Chrust et al., 2013). The latter clearly shows the development of hairpin vortices and the loss of planar symmetry

Item URL in elib:https://elib.dlr.de/136382/
Document Type:Conference or Workshop Item (Other)
Additional Information:STAB-Jahresbericht 2020
Title:On the Coverage of Dynamic Processes in Highly Separated Flows Using the Lattice Boltzmann Method
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bauer, ChristianChristian.Bauer (at) dlr.dehttps://orcid.org/0000-0003-1838-6194
Müller, MaxMax.Mueller (at) dlr.deUNSPECIFIED
Ehrenfried, KlausKlaus.Ehrenfried (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) DLR.deUNSPECIFIED
Date:October 2020
Journal or Publication Title:22nd STAB/DGLR Symposium on New Results in Numerical and Experimental Fluid Mechanics XIII - Jahresbericht 2020
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 110-111
Publisher:Springer Nature
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
Status:Published
Keywords:Lattice Boltzmann Method, Unsteady Aerodynamics
Event Title:22. STAB/DGLR Symposium 2020
Event Location:Göttingen, Deutschland
Event Type:national Conference
Event Dates:15. Juli 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
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:09 Dec 2020 10:30

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