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research-article

Prediction of Turbulent Flow around a Square Cylinder With Rounded Corners

[+] Author and Article Information
Shaoshi Dai

Deep Water Engineering Research Center, Harbin Engineering University, 150001, China
daishaoshi@163.com

Bassam A. Younis

Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA
bayounis@ucdavis.edu

Hongyang Zhang

Deep Water Engineering Research Center, Harbin Engineering University, 150001, China
123566886@qq.com

1Corresponding author.

ASME doi:10.1115/1.4035957 History: Received June 30, 2016; Revised January 18, 2017

Abstract

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 data from flows pastcylinders 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 RANS approach to this important class of flows provided that the effects of vortex shedding are properly accounted for in the turbulence closure.

Copyright (c) 2017 by ASME
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