<div class="csl-bib-body">
<div class="csl-entry">Stojanovic, I., & Braun, S. (2022, September 15). <i>Viscous layer dynamics of the Euler-Prandtl stage in marginal separation</i> [Conference Presentation]. 14th European Fluid Mechanics Conference (Athens), Athens, Greece.</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/80596
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dc.description.abstract
In the present work we consider the incipient stages of the transition from laminar to turbulent flow caused by a localized separation of a boundary layer. From a high Reynolds number asymptotic viewpoint the early development of this so-called bypass transition can be described in four characteristic stages, see Figure 1, of which we focus on the last one. Starting from the classical boundary layer theory, the laminar flow is forced to separate locally due to an imposed adverse pressure gradient (i). Taking into account the interaction between the displacement of the viscous layer and the induced pressure from the inviscid outer region allows the characterization of reverse flow regions (ii). The resulting evolution of the marginal separation stage typically develops a finite-time singularity. This breakdown is resolved by yet another triple-deck (TD) interaction with smaller length and time scales (iii). The computation of the TD stage indicates the formation of a spike at the rear of the separation bubble. However, the TD stage fails to cover the subsequent vortex wind-up process, which is governed by the Euler-Prandtl (EP) stage (iv). This stage is represented by two non-interacting regions, i.e. the inviscid Euler region (investigated by Kuzdas2) and the viscous Prandtl layer, which is of key interest in our study. This layer is introduced to satisfy the no-slip condition. The pressure gradient is imposed from the Euler region and the initial condition follows from the blow-up structure of the TD stage.
Such high Reynolds number flows can be observed for example at the leading edge suction side of a slender airfoil at a small angle of attack. The method of matched asymptotic expansions is used to analyze the Navier-Stokes equations. The resulting equations are solved by means of a spectral collocation method based on Chebyshev polynomials in wall-normal and streamwise direction. A backward Euler finite-difference scheme is applied for the time discretization.
The work is supported by the Austrian Science Fund FWF (grant no. P31873-N32).
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dc.description.sponsorship
Fonds zur Förderung der wissenschaftlichen Forschung (FWF)
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dc.language.iso
en
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dc.subject
laminar-turbulent transition
en
dc.subject
matched asymptotic expansions
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dc.subject
marginal separation
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dc.subject
spectral methods
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dc.subject
laminar separation bubble
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dc.title
Viscous layer dynamics of the Euler-Prandtl stage in marginal separation
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.relation.grantno
P31873-N32
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dc.type.category
Conference Presentation
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tuw.project.title
Bypass Transition aus asymptotischer Sicht
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tuw.researchTopic.id
C2
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tuw.researchTopic.id
C4
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tuw.researchTopic.id
C5
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tuw.researchTopic.name
Computational Fluid Dynamics
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tuw.researchTopic.name
Mathematical and Algorithmic Foundations
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tuw.researchTopic.name
Computer Science Foundations
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tuw.researchTopic.value
60
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tuw.researchTopic.value
30
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tuw.researchTopic.value
10
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tuw.publication.orgunit
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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tuw.author.orcid
0000-0002-7145-1103
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tuw.event.name
14th European Fluid Mechanics Conference (Athens)
en
tuw.event.startdate
13-09-2022
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tuw.event.enddate
16-09-2022
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tuw.event.online
On Site
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tuw.event.type
Event for scientific audience
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tuw.event.place
Athens
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tuw.event.country
GR
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tuw.event.presenter
Stojanovic, Ivo
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wb.sciencebranch
Maschinenbau
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wb.sciencebranch
Mathematik
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wb.sciencebranch.oefos
2030
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wb.sciencebranch.oefos
1010
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wb.sciencebranch.value
60
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wb.sciencebranch.value
40
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item.openairetype
Presentation
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item.openairetype
Vortrag
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item.grantfulltext
none
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item.cerifentitytype
Publications
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item.cerifentitytype
Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.fulltext
no Fulltext
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crisitem.project.funder
Fonds zur Förderung der wissenschaftlichen Forschung (FWF)
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crisitem.project.grantno
P31873-N32
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crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
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crisitem.author.dept
E322-01 - Forschungsbereich Strömungsmechanik
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crisitem.author.orcid
0000-0002-7145-1103
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crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung
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crisitem.author.parentorg
E322 - Institut für Strömungsmechanik und Wärmeübertragung