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Descripción
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| Typical streak computations present in the literature correspond to linear streaks or to small amplitude nonlinear streaks computed using DNS or nonlinear PSE. We use the Reduced Navier-Stokes (RNS) equations to compute the streamwise evolution of fully non-linear streaks with high amplitude in a laminar flat plate boundary layer. The RNS formulation provides Reynolds number independent solutions that are asymptotically exact in the limit Re>>1, it requires much less computational e®ort than DNS, and it does not have the consistency and convergence problems of the PSE. We present various streak computations to show that the flow configuration changes substantially when the amplitude of the streaks grows and the nonlinear e®ects come into play. The transversal motion (in the wall normal-streamwise plane) becomes more important and strongly distorts the streamwise velocity profiles, that end up being quite different from those of the linear case. We analyze in detail the resulting flow patterns for the nonlinearly saturated streaks and compare them with available experimental results. | |
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Internacional
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Si |
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Nombre congreso
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6th ERCOFTAC Iberian West PC |
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Tipo de participación
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960 |
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Lugar del congreso
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Vigo, Pontevedra, España. |
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Revisores
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Si |
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ISBN o ISSN
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sin ISBN |
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DOI
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Fecha inicio congreso
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07/10/2011 |
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Fecha fin congreso
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07/10/2011 |
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Desde la página
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22 |
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Hasta la página
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22 |
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Título de las actas
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Bulletin of ERCOFTAC iberian West PC |