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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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.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Nonlinear Nonlocal Instability Analyses of Transitional Separation Bubbles|
|In ISI Web of Science:||No|
|Keywords:||transitional separation bubble, convective instability, linear and nonlinear nonlocal instability analysis, NOLOT/PSE, comparison with DNS|
|Event Title:||NATO RTO AVT-111, Specialists' Meeting on Enhancement of NATO Military Flight Vehicle Performance by Management of Interacting Boundary Layer Transition and Separation|
|Event Location:||Prague (Czech Republic)|
|Event Type:||international Conference|
|Event Dates:||2004-10-04 - 2004-10-07|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flight Physics|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Helicopters|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||24 Aug 2007|
|Last Modified:||14 Jan 2010 19:35|
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