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Numerical and Experimental Investigations of Oblique Boundary Layer Transition

Wiegel, M. and Berlin, S. and Henningson, D.S. (1999) Numerical and Experimental Investigations of Oblique Boundary Layer Transition. Journal of Fluid Mechanics, 393, pp. 23-57.

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Abstract

A transition scenario initiated by two oblique waves is studied in an incompressible boundary layer. Hot-wire measurements and flow visualizations of this scenario are reported for the first time. The experimental results are compared with spatial direct numerical simulations and a good qualitative agreement is found. Also quantitative agreement is found when the experimental device for disturbance generation is closely modeled and pressure gradient effects taken into account. The oblique waves are found to interact nonlinearly to produce streamwise streaks growing downstream, related to non-modal linear growth mechanisms. The same has previously been observed in channel flows and calculations of both compressible and incompressible boundary layers. The flow structures of oblique transition have many similarities to K- and H-type transition, for which two-dimensional Tollmien-Schlichting waves are the starting point. However, two-dimensional Tollmien-Schlichting waves are usually not initiated or observed in oblique transition and consequently the similarities are due to the oblique waves and streamwise streaks appearing in all three scenarios

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1999,
Title:Numerical and Experimental Investigations of Oblique Boundary Layer Transition
Authors:
AuthorsInstitution or Email of Authors
Wiegel, M.UNSPECIFIED
Berlin, S.KTH Stockholm
Henningson, D.S.FFA Bromma
Date:1999
Journal or Publication Title:Journal of Fluid Mechanics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:393
Page Range:pp. 23-57
Status:Published
Keywords:oblique transition, bypass transition, streaks, non-modal linear growth, transient growth
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L TG - Querschnittstechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:29

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