Coherent structures in marginally turbulent square duct flow

Markus Uhlmann; Alfredo Pinelli; Atsushi Sekimoto; Genta Kawahara

doi:10.1007/978-1-4020-6472-2_21

Coherent structures in marginally turbulent square duct flow

Markus Uhlmann, Alfredo Pinelli, Atsushi Sekimoto, Genta Kawahara

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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.

Original language	English
Title of host publication	IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Pages	137-142
Number of pages	6
DOIs	https://doi.org/10.1007/978-1-4020-6472-2_21
Publication status	Published - 2008
Externally published	Yes
Event	IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Nagoya, Japan Duration: Sept 11 2006 → Sept 14 2006

Publication series

Name	Solid Mechanics and its Applications
Volume	4
ISSN (Print)	1875-3507

Other

Other	IUTAM Symposium on Computational Physics and New Perspectives in Turbulence
Country/Territory	Japan
City	Nagoya
Period	9/11/06 → 9/14/06

Keywords

Coherent structure
Marginally turbulent flow
Secondary flow
Square duct

ASJC Scopus subject areas

Civil and Structural Engineering
Automotive Engineering
Aerospace Engineering
Acoustics and Ultrasonics
Mechanical Engineering

Access to Document

10.1007/978-1-4020-6472-2_21

Cite this

Uhlmann, M., Pinelli, A., Sekimoto, A., & Kawahara, G. (2008). Coherent structures in marginally turbulent square duct flow. In IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence (pp. 137-142). (Solid Mechanics and its Applications; Vol. 4). https://doi.org/10.1007/978-1-4020-6472-2_21

Coherent structures in marginally turbulent square duct flow. / Uhlmann, Markus; Pinelli, Alfredo; Sekimoto, Atsushi et al.
IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence. 2008. p. 137-142 (Solid Mechanics and its Applications; Vol. 4).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Uhlmann, M, Pinelli, A, Sekimoto, A & Kawahara, G 2008, Coherent structures in marginally turbulent square duct flow. in IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence. Solid Mechanics and its Applications, vol. 4, pp. 137-142, IUTAM Symposium on Computational Physics and New Perspectives in Turbulence, Nagoya, Japan, 9/11/06. https://doi.org/10.1007/978-1-4020-6472-2_21

Uhlmann M, Pinelli A, Sekimoto A, Kawahara G. Coherent structures in marginally turbulent square duct flow. In IUTAM Symposium on Computational Physics and New Perspectives in Turbulence - Proceedings of the IUTAM Symposium on Computational Physics and New Perspectives in Turbulence. 2008. p. 137-142. (Solid Mechanics and its Applications). doi: 10.1007/978-1-4020-6472-2_21

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AB - 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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Coherent structures in marginally turbulent square duct flow

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Keywords

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