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Nonlinear Nonlocal Instability Analyses of Transitional Separation Bubbles

Hein, S. (2004) Nonlinear Nonlocal Instability Analyses of Transitional Separation Bubbles. NATO RTO AVT-111, Specialists' Meeting on Enhancement of NATO Military Flight Vehicle Performance by Management of Interacting Boundary Layer Transition and Separation, 2004-10-04 - 2004-10-07, Prague (Czech Republic).

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Kurzfassung

The linear and nonlinear instability properties of steady laminar two-dimensional incompressible boundary-layer flows with thin separation bubbles are analyzed by means of nonlocal instability theory based on the parabolized stability equations (PSE). The results are compared to data from a direct numerical simulation (DNS). Good to excellent agreement is found in the linear as well as the moderately nonlinear regime, clearly demonstrating that PSE methods are an appropriate instability analysis tool for this type of flow as well. Moreover, a vortex-shedding Strouhal number available in literature and reportedly being independent of Reynolds number and pressure gradient is verified. This Strouhal number, obtained by time-accurate Navier-Stokes simulations, is in line with the Strouhal numbers of the most amplified two-dimensional disturbances obtained from the instability analysis of the two laminar separated flows considered here.

Dokumentart:Konferenzbeitrag (Paper)
Titel:Nonlinear Nonlocal Instability Analyses of Transitional Separation Bubbles
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hein, S.NICHT SPEZIFIZIERT
Datum:2004
Referierte Publikation:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:transitional separation bubble, convective instability, linear and nonlinear nonlocal instability analysis, NOLOT/PSE, comparison with DNS
Veranstaltungstitel:NATO RTO AVT-111, Specialists' Meeting on Enhancement of NATO Military Flight Vehicle Performance by Management of Interacting Boundary Layer Transition and Separation
Veranstaltungsort:Prague (Czech Republic)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2004-10-04 - 2004-10-07
Veranstalter :RTO
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Hubschrauber
Hinterlegt von: elib DLR-Beauftragter
Hinterlegt am:24 Aug 2007
Letzte Änderung:14 Jan 2010 19:35

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