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Uhlmann, Markus and Pinelli, Alfredo and Sekimoto, Atshushi and Kawahara, Genta
(2008)
*Coherent structures in marginally turbulent square duct flow.*
In
IUTAM Symposium on Computational Physics and New Perspectives in Turbulence.
IUTAM Bookseries, Part I
(4).
Springer, pp. 137-142.
ISBN 978-1-4020-6471-5

Official URL: http://link.springer.com/chapter/10.1007/978-1-4020-6472-2_21

## Abstract

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.

Item Type: | Book Section |
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Additional Information: | Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence, Nagoya University, Nagoya, Japan, September, 11-14, 2006 |

Uncontrolled Keywords: | square duct; marginally turbulent flow; coherent structure; secondary flow |

Subjects: | Sciences > Physics |

ID Code: | 22021 |

Deposited On: | 20 Jun 2013 08:19 |

Last Modified: | 12 Dec 2018 15:07 |

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