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Descripción
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| dies. An angular momentum injection scheme is proposed to shift the critical Reynolds number corresponding to the first Hopf bifurcation to higher values. We show that the base suction, wake formation length, absolute instability, and the Karman vortex street are e ectively controlled by the angular momentum injection. An analytical boundary condition is designed to implement the injection. The Navier-Stokes equations, along with the control mechanism, are solved and the resulting base ow has been analyzed by the BiGlobal stability theory. New critical Reynolds numbers have been calculated depending on the control parameters and the geometry considered. Initially a circular cylinder has been considered as a validation case and after it two di erent blu bodies have been also studied. This numerical experiments have been also validated experimentally under the hypothesis that the imposition of a slip velocity boundary condition at the wall can be certainly represented by the operation of a electrohydrodynamic (EHD) actuators. Particle Image Velocimetry (PIV) visualizations and experimental measurements show how the presence of these EHD actuators are able to eliminate completely the vortex shedding in the wake. | |
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Internacional
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Si |
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Nombre congreso
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Symposium on Global Flow Instability and Control |
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Tipo de participación
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960 |
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Lugar del congreso
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Creta Grecia |
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Revisores
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Si |
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ISBN o ISSN
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978-84-692-6247-4 |
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DOI
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Fecha inicio congreso
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27/09/2009 |
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Fecha fin congreso
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02/10/2010 |
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2 |
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Título de las actas
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Global Flow Instability and Control |