Large-eddy simulation of turbulent flow and structures in a square duct roughened with perpendicular and V-shaped ribs

Xingjun Fang; Zixuan Yang; Bing Chen Wang; Mark F. Tachie; Donald J. Bergstrom

doi:10.1063/1.4985715

Large-eddy simulation of turbulent flow and structures in a square duct roughened with perpendicular and V-shaped ribs

Xingjun Fang, Zixuan Yang, Bing Chen Wang, Mark F. Tachie, Donald J. Bergstrom

Mechanical Engineering

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31 Scopus citations

Abstract

In this paper, highly disturbed turbulent flows confined within a square duct with uniformly spaced=V-shaped ribs mounted on one wall are investigated using large-eddy simulation (LES). Two Vshaped (60° and 45°) rib cases are studied in comparison with the perpendicular (90°) rib case. The LES results are validated against a set of water-channel measurement data newly acquired by the authors. The effects of different shaped ribs on turbulent flow are systematically studied in terms of the mean velocity field, turbulence statistics, and coherent structures. The results show that strong secondary flows in the pattern of a pair of large symmetrical streamwise-elongated vortices exist in all three rib cases. The impacts of rib geometry on turbulent coherent structures are investigated using vortex identifiers, temporal autocorrections, spatial two-point autocorrelations, and velocity spectra.

Original language	English (US)
Article number	065110
Journal	Physics of Fluids
Volume	29
Issue number	6
DOIs	https://doi.org/10.1063/1.4985715
State	Published - Jun 1 2017

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10.1063/1.4985715

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title = "Large-eddy simulation of turbulent flow and structures in a square duct roughened with perpendicular and V-shaped ribs",

abstract = "In this paper, highly disturbed turbulent flows confined within a square duct with uniformly spaced=V-shaped ribs mounted on one wall are investigated using large-eddy simulation (LES). Two Vshaped (60° and 45°) rib cases are studied in comparison with the perpendicular (90°) rib case. The LES results are validated against a set of water-channel measurement data newly acquired by the authors. The effects of different shaped ribs on turbulent flow are systematically studied in terms of the mean velocity field, turbulence statistics, and coherent structures. The results show that strong secondary flows in the pattern of a pair of large symmetrical streamwise-elongated vortices exist in all three rib cases. The impacts of rib geometry on turbulent coherent structures are investigated using vortex identifiers, temporal autocorrections, spatial two-point autocorrelations, and velocity spectra.",

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AU - Fang, Xingjun

AU - Yang, Zixuan

AU - Wang, Bing Chen

AU - Tachie, Mark F.

AU - Bergstrom, Donald J.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - In this paper, highly disturbed turbulent flows confined within a square duct with uniformly spaced=V-shaped ribs mounted on one wall are investigated using large-eddy simulation (LES). Two Vshaped (60° and 45°) rib cases are studied in comparison with the perpendicular (90°) rib case. The LES results are validated against a set of water-channel measurement data newly acquired by the authors. The effects of different shaped ribs on turbulent flow are systematically studied in terms of the mean velocity field, turbulence statistics, and coherent structures. The results show that strong secondary flows in the pattern of a pair of large symmetrical streamwise-elongated vortices exist in all three rib cases. The impacts of rib geometry on turbulent coherent structures are investigated using vortex identifiers, temporal autocorrections, spatial two-point autocorrelations, and velocity spectra.

AB - In this paper, highly disturbed turbulent flows confined within a square duct with uniformly spaced=V-shaped ribs mounted on one wall are investigated using large-eddy simulation (LES). Two Vshaped (60° and 45°) rib cases are studied in comparison with the perpendicular (90°) rib case. The LES results are validated against a set of water-channel measurement data newly acquired by the authors. The effects of different shaped ribs on turbulent flow are systematically studied in terms of the mean velocity field, turbulence statistics, and coherent structures. The results show that strong secondary flows in the pattern of a pair of large symmetrical streamwise-elongated vortices exist in all three rib cases. The impacts of rib geometry on turbulent coherent structures are investigated using vortex identifiers, temporal autocorrections, spatial two-point autocorrelations, and velocity spectra.

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Large-eddy simulation of turbulent flow and structures in a square duct roughened with perpendicular and V-shaped ribs

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