Direct numerical simulations of variable-aspect-ratio turbulent duct flows at low to moderate reynolds numbers

Vinuesa R, Noorani A, Lozano-Durán A, El Khoury G, Schlatter P, Fischer PF, Nagib HM (2013)

Publication Type: Conference contribution

Publication year: 2013

Publisher: TSFP-8

Book Volume: 1

Conference Proceedings Title: International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013

Event location: Poitiers, FRA

ISBN: 9780000000002

Abstract

Three-dimensional effects in turbulent duct flows, i.e., side-wall boundary layers and secondary motions, are studied by means of direct numerical simulations (DNS). The spectral element code Nek5000 is used to compute turbulent duct flows with aspect ratios 1 to 7 (at Reb, c = 2800, Reτ 180) and 1 (at Reb, c = 5600, Reτ 330) in streamwiseperiodic boxes of length 25h. The total number of grid points ranges from 28 to 145 million, and the fluid kinematic viscosity n was adjusted iteratively in order to keep the same bulk Reynolds number at the centerplane with changing aspect ratio. Spanwise variations in wall shear, mean-flow profiles and turbulence statistics are analyzed with aspect ratio, and also compared with the 2D channel. These computations show good agreement with experimental measurements carried out at IIT in parallel, and reinforces one important conclusion: the conditions obtained in the core region of a high-aspect-ratio duct cannot exactly be reproduced by spanwise-periodic DNSs of turbulent channel flows.

Authors with CRIS profile

Philipp Schlatter

Involved external institutions

Illinois Institute of Technology US United States (USA) (US) Royal Institute of Technology / Kungliga Tekniska Högskolan (KTH) SE Sweden (SE) Universidad Politécnica de Madrid (UPM) ES Spain (ES) Argonne National Laboratory US United States (USA) (US)

How to cite

APA:

Vinuesa, R., Noorani, A., Lozano-Durán, A., El Khoury, G., Schlatter, P., Fischer, P.F., & Nagib, H.M. (2013). Direct numerical simulations of variable-aspect-ratio turbulent duct flows at low to moderate reynolds numbers. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013. Poitiers, FRA: TSFP-8.

MLA:

Vinuesa, Ricardo, et al. "Direct numerical simulations of variable-aspect-ratio turbulent duct flows at low to moderate reynolds numbers." Proceedings of the 8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013, Poitiers, FRA TSFP-8, 2013.

BibTeX: Download