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Título:
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Three dimensional structures of flow through a square cylinder with an upstream splitter plate and for several velo city ratios
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Autor/a:
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El Mansy, Reda; Sarwar, Wasim; Rodríguez Pérez, Ivette María; Bergadà Granyó, Josep Maria
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics; Universitat Politècnica de Catalunya. Departament de Mecànica de Fluids; Universitat Politècnica de Catalunya. TUAREG - Turbulence and Aerodynamics in Mechanical and Aerospace Engineering Research Group |
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Abstract:
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In the present paper, three-dimensional Fluid structures and wake characteristics are evaluated for a square cylinder with an upstream splitter plate.
The splitter plate divides the incoming flow in two streams, the upper
and lower one, existing between them a velocity ratio. Two different
Reynolds numbers of 56 and 200 and three different velocity ratios are
here considered. The effect of the mixing enhancement using a
square cylinder located downstream of the splitter plate is evaluated.
A Floquet analysis to compute the spanwise wavelengths of three dimensional disturbances appearing in the square cylinder wake with
and without a splitter plate is performed.
It is observed that the use of the detached splitter plate has a
stabilizing effect at low velocity ratios.
However, when the velocity ratio increases, the vortex shedding
suffers a linear increase and the wake resembles that of a mixing layer.
Vortex dislocations appear at ratios larger than 2, which points out
the onset of a bifurcation to a more chaotic wake. The wavelength
of this secondary instability has been measured by means of Floquet
analysis and two-point correlations being in the order of 3.5D. |
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Abstract:
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Peer Reviewed |
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Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids
-Reynolds number
-Fluid dynamics
-Square cylinder
-splitter plate
-3D CFD
-Dinàmica de fluids -- Càlcul numèric |
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Derechos:
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Tipo de documento:
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Artículo - Versión publicada
Objeto de conferencia |
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