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Título:
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Coherent structures in marginally turbulent square duct flow
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Autores:
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Uhlmann, Markus ;
Pinelli, Alfredo ;
Sekimoto, Atshushi ;
Kawahara, Genta
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Tipo de documento:
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texto impreso
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Editorial:
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Springer, 2008
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física
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Tipo = Sección de libro
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Resumen:
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Direct numerical simulation of fully developed turbulent flow in a straight square duct was performed in order to determine the minimal requirements for self-sustaining turbulence. It was found that turbulence can be maintained for values of the bulk Reynolds number above approximately 1100, corresponding to a friction-velocity-based Reynolds number of 80. The minimum value for the streamwise period of the computational domain measures around 190 wall units, roughly independently of the Reynolds number. Furthermore, we present a characterization of the marginal state, where coherent structures are found to have significant relevance to the appearance of secondary flow of Prandtl’s second kind.
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