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Descripción
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| Streaky perturbations play an essential role in the destabilization of boundary layers, especially in the presence of free-stream turbulence. These perturbations are calculated in terms of a streamwise evolving parabolic problem. Using the asymptotic behaviour of the solutions near the leading edge singularity, we obtain a low-dimensional modal description of the streaks in the case of a boundary layer attached to a flat plate. Comparison with optimal streaks obtained via the adjoint gradient (Luchini, JFM 2000), seems to indicate that the development of the instability may be understood on the basis of appropriate amplitude equations giving the streamwise evolution of the amplitudes of the relevant modes. | |
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Internacional
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Si |
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Nombre congreso
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61st Annual Meeting of the APS Division of Fluid Dynamics. |
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Tipo de participación
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960 |
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Lugar del congreso
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San Antonio, Texas, EE.UU |
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Revisores
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Si |
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ISBN o ISSN
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0003-0503 |
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DOI
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Fecha inicio congreso
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23/11/2008 |
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Fecha fin congreso
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25/11/2008 |
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Desde la página
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126 |
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Hasta la página
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126 |
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Título de las actas
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Bulletin of the American Physical Society, Division of Fluids Dynamics. 'Low-Dimensional Modal Descriptionof Optimal Streaks'. |