Linear global instability of non-orthogonal incompressible swept attachment-line boundary layer flow

Pérez Pérez, José Miguel and Rodríguez Álvarez, Daniel and Theofilis, Vassilios (2011). Linear global instability of non-orthogonal incompressible swept attachment-line boundary layer flow. In: "6th AIAA Theoretical Fluid Mechanics Conference", 27/06/2011 - 30/06/2011, Honolulu, Hawaii, USA.

Description

Title: Linear global instability of non-orthogonal incompressible swept attachment-line boundary layer flow
Author/s:
  • Pérez Pérez, José Miguel
  • Rodríguez Álvarez, Daniel
  • Theofilis, Vassilios
Item Type: Presentation at Congress or Conference (Article)
Event Title: 6th AIAA Theoretical Fluid Mechanics Conference
Event Dates: 27/06/2011 - 30/06/2011
Event Location: Honolulu, Hawaii, USA
Title of Book: 6th AIAA Theoretical Fluid Mechanics Conference
Date: 2011
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Instability of the orthogonal swept attachment line boundary layer has received attention by local1, 2 and global3–5 analysis methods over several decades, owing to the significance of this model to transition to turbulence on the surface of swept wings. However, substantially less attention has been paid to the problem of laminar flow instability in the non-orthogonal swept attachment-line boundary layer; only a local analysis framework has been employed to-date.6 The present contribution addresses this issue from a linear global (BiGlobal) instability analysis point of view in the incompressible regime. Direct numerical simulations have also been performed in order to verify the analysis results and unravel the limits of validity of the Dorrepaal basic flow7 model analyzed. Cross-validated results document the effect of the angle _ on the critical conditions identified by Hall et al.1 and show linear destabilization of the flow with decreasing AoA, up to a limit at which the assumptions of the Dorrepaal model become questionable. Finally, a simple extension of the extended G¨ortler-H¨ammerlin ODE-based polynomial model proposed by Theofilis et al.4 is presented for the non-orthogonal flow. In this model, the symmetries of the three-dimensional disturbances are broken by the non-orthogonal flow conditions. Temporal and spatial one-dimensional linear eigenvalue codes were developed, obtaining consistent results with BiGlobal stability analysis and DNS. Beyond the computational advantages presented by the ODE-based model, it allows us to understand the functional dependence of the three-dimensional disturbances in the non-orthogonal case as well as their connections with the disturbances of the orthogonal stability problem.

More information

Item ID: 12517
DC Identifier: http://oa.upm.es/12517/
OAI Identifier: oai:oa.upm.es:12517
Deposited by: Memoria Investigacion
Deposited on: 27 Feb 2013 09:54
Last Modified: 22 Sep 2014 10:55
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