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Research Papers: CFD and VIV

Prediction of Turbulent Flow Around a Square Cylinder With Rounded Corners

[+] Author and Article Information
S. S. Dai, H. Y. Zhang

Deep Water Engineering Research Center,
Harbin Engineering University,
Harbin 150001, China

B. A. Younis

Department of Civil and
Environmental Engineering,
University of California,
Davis, CA 95616

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 30, 2016; final manuscript received January 18, 2017; published online April 11, 2017. Assoc. Editor: David R. Fuhrman.

J. Offshore Mech. Arct. Eng 139(3), 031804 (Apr 11, 2017) (9 pages) Paper No: OMAE-16-1073; doi: 10.1115/1.4035957 History: Received June 30, 2016; Revised January 18, 2017

Predictions are reported of the two-dimensional turbulent flow around a square cylinder with rounded corners at high Reynolds numbers. The effects of rounded corners have proved difficult to predict with conventional turbulence closures, and hence, the adoption in this study of a two-equation closure that has been specifically adapted to account for the interactions between the organized mean-flow motions due to vortex shedding and the random motions due to turbulence. The computations were performed using openfoam and were validated against the data from flows past cylinders with sharp corners. For the case of rounded corners, only the modified turbulence closure succeeded in capturing the consequences of the delayed flow separation manifested mainly in the reduction of the magnitude of the lift and drag forces relative to the sharp-edged case. These and other results presented here argue in favor of the use of the computationally more efficient unsteady Reynolds-averaged Navier-Stokes approach to this important class of flows provided that the effects of vortex shedding are properly accounted for in the turbulence closure.

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Figures

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Fig. 1

Grid arrangement and boundary conditions: (a) grid distribution and computational domain, (b) mesh details near rounded corners, and (c) locations of pressure monitoring points

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Fig. 2

Predicted variation of lift- and drag coefficients with time as obtained with the standard and the modified k–ϵ models for cylinder with rounded corners (Re=2.0×104)

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Fig. 3

Contours of velocity and pressure for square cylinder with sharp corners (Re=2.0×104): (a) velocity contours and (b) pressure contours

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Fig. 4

Time history of Cd and Cl of square cylinder with sharp corners (Re=2.0×104)

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Fig. 5

Instantaneous velocity vectors and streamlines of square cylinder at Re=2.0×104: (a) sharp-cornered cylinder and (b) rounded corners cylinder

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Fig. 6

Predicted and measured mean wall static pressure distribution: (a) Re=2.0×104 and (b) Re=2.0×105

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Fig. 7

Predicted variation of fluctuating pressure versus θ: (a) Re=2.0×104 and (b) Re=2.0×105

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Fig. 8

Time history of drag and lift coefficients for rounded corners cylinder (Re=2×104)

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Fig. 9

Comparison of time history of drag for square column with rounded corners at different Reynolds number: (a) Re=2.0×104 and (b) Re=2.0×105

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Fig. 10

Comparison of time history of lift forces for square column with rounded corners at different Reynolds number: (a) Re=2.0×104 and (b) Re=2.0×105

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Fig. 11

Predicted power spectrum of fluctuating lift coefficients for square column with and without rounded corners at Re=2.0×105

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