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Memorias de investigación
Communications at congresses:
On Instability Properties of Incompressible Laminar Separation Bubbles on a Flat Plate Prior to Shedding
Year:2007
Research Areas
  • Fluid mechanics
Information
Abstract
Our present concern is with identification and systematic classification of the parameters defining the race between two-dimensional shedding and three-dimensional global instability of two-dimensional incompressible laminar separation bubbles. Here attention is paid to separation bubbles generated in a flat plate boundary layer subject to Howarth's adverse-pressure gradient in the Reynolds number range Re in [10000,50000], within which BiGlobal instability in laminar separation bubbles was first discovered. A two-dimensional direct numerical simulation (DNS) methodology is being utilized for the recovery of laminar separated boundary layer flows. Preliminary three-dimensional BiGlobal instability analyses have demonstrated the stringent resolution requirements for complete and accurate description of the instability physics pertinent to the convectively unstable (and globally stable) Kelvin-Helmholtz (KH) modes. This gave rise to the development of novel numerical solution approaches for both the DNS and the BiGlobal eigenvalue problems, based on large-scale parallelization; first results on model applications are reported.
International
Si
Congress
AIAA-2007-540, 45th AIAA Aerospace Sciences Meeting and Exhibit
960
Place
Reno, NV, USA
Reviewers
Si
ISBN/ISSN
ISBN-10: 1-56347-890
Start Date
08/01/2007
End Date
11/01/2007
From page
To page
Participants
  • Autor: Vassilios Theofilis (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Mecánica de Fluidos Computacional
  • Departamento: Motopropulsión y Termofluidodinámica
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