Flow features in three-dimensional turbulent duct flows with different aspect ratios

Vinuesa R, Schlatter P, Nagib HM (2016)

Publication Type: Conference contribution

Publication year: 2016

Publisher: Springer Science and Business Media, LLC

Book Volume: 165

Pages Range: 123-126

Conference Proceedings Title: Springer Proceedings in Physics

Event location: Warsaw, POL

ISBN: 9783319291291

DOI: 10.1007/978-3-319-29130-7_22

Abstract

Direct numerical simulations of turbulent duct flows with width-to-height ratios 1, 3, 5, 7 and 10, at a friction Reynolds number Reτ,c ≃ 180, are carried out with the spectral element code Nek5000. The aim of these simulations is to gain insight into the kinematics and dynamics of Prandtl’s secondary flow of second kind, and its impact on the flow physics of wall-bounded turbulence. The secondary flow is characterized in terms of the cross-plane mean kinetic energy K = (V2 + W2)/2, and its variation in the spanwise direction of the flow. Our results show that averaging times of at least 3, 000 time units are required to reach a converged state of the secondary flow, which extends up to z* ≃ 5 h from the side walls. We also show that if the duct is not wide enough to accommodate the whole extent of the secondary flow, then its structure is modified by means of a different spanwise distribution of energy. Future proposed work includes coherent structure eduction, quadrant analysis at the corner, and comparisons with spanwise-periodic channels at comparable Reynolds numbers.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) Indian Institute of Technology (IIT) Gandhinagar IN India (IN)

How to cite

APA:

Vinuesa, R., Schlatter, P., & Nagib, H.M. (2016). Flow features in three-dimensional turbulent duct flows with different aspect ratios. In Alessandro Talamelli, Joachim Peinke, Gerrit Kampers, Martin Oberlack, Marta Wacławczyk (Eds.), Springer Proceedings in Physics (pp. 123-126). Warsaw, POL: Springer Science and Business Media, LLC.

MLA:

Vinuesa, Ricardo, Philipp Schlatter, and Hassan M. Nagib. "Flow features in three-dimensional turbulent duct flows with different aspect ratios." Proceedings of the 6th International Conference on Progress in Turbulence, iTi 2014, Warsaw, POL Ed. Alessandro Talamelli, Joachim Peinke, Gerrit Kampers, Martin Oberlack, Marta Wacławczyk, Springer Science and Business Media, LLC, 2016. 123-126.

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