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Abstract
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| 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. | |
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International
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Si |
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Congress
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AIAA-2007-540, 45th AIAA Aerospace Sciences Meeting and Exhibit |
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960 |
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Place
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Reno, NV, USA |
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Reviewers
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Si |
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ISBN/ISSN
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ISBN-10: 1-56347-890 |
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Start Date
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08/01/2007 |
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End Date
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11/01/2007 |
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