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Linear and Nonlinear Growth of Secondary Instabilities of Stationary Crossflow Vortices Studied by Parabolized Stability Equations

Hein, Stefan (2016) Linear and Nonlinear Growth of Secondary Instabilities of Stationary Crossflow Vortices Studied by Parabolized Stability Equations. 20. DGLR-Fachsymposium der STAB, Braunschweig, Deutschland.

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Abstract

Laminar-turbulent transition in (quasi-) three-dimensional boundary layers dominated by stationary crossflow vortices is studied for the setup of the DLR swept-flat plate experiment. The linear an subsequent nonlinear development of both the stationary crossflow vortices and thier high-frequency secondary instabilities are modelled by nonlinear parabolized stability equations (PSE). In contrast to previous work secondary instability theory is used only for initialization of secondary instabilities within the PSE analysis. Thereby, the nonlinear development of secondary instabilities including the generation of higher harmonics could be studied up to the stages where the feedback of the finite-amplitude secondary instability modes on the stationary crossflow vortices is no longer negligible and the skin-friction coefficient starts to deviate from that due to the mean flow distortion caused by the stationary crossflow modes alone. Moreover, present approach allows rather efficient studies on the nonlinear development of secondary instabilities independent of thier frequency.

Item URL in elib:https://elib.dlr.de/104861/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://www.tu-braunschweig.de/stab2016
Title:Linear and Nonlinear Growth of Secondary Instabilities of Stationary Crossflow Vortices Studied by Parabolized Stability Equations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hein, Stefanstefan.hein (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:laminar-turbulent transition, DLR swept flat plate Experiment, three-dimensional boundary layer, parabolized stability equations NOLOT/PSE, secondary instability theory
Event Title:20. DGLR-Fachsymposium der STAB
Event Location:Braunschweig, Deutschland
Event Type:national Conference
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Military Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > High Speed Configurations
Deposited By: Bachmann, Barbara
Deposited On:02 Dec 2016 13:13
Last Modified:11 Jan 2017 15:30

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