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Coherent structures in marginally turbulent square duct flow

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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


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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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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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