Numerical simulation of flow over a square cylinder with upstream and downstream circular bar using lattice Boltzmann method

Yuan Ma, Rasul Mohebbi, M. M. Rashidi () and Zhigang Yang
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Yuan Ma: Shanghai Automotive Wind Tunnel Center, Tongji University, No. 4800, Cao’an Road, Shanghai 201804, P. R. China†Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, No. 4800, Cao’an Road, Shanghai 201804, P. R. China
Rasul Mohebbi: #x2021;School of Engineering, Damghan University, P. O. Box 3671641167, Damghan, Iran
M. M. Rashidi: #xA7;Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham, UK
Zhigang Yang: Shanghai Automotive Wind Tunnel Center, Tongji University, No. 4800, Cao’an Road, Shanghai 201804, P. R. China†Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, No. 4800, Cao’an Road, Shanghai 201804, P. R. China

International Journal of Modern Physics C (IJMPC), 2018, vol. 29, issue 04, 1-28

Abstract: A numerical investigation is carried out to analyze the flow patterns, drag and lift coefficients, and vortex shedding around a square cylinder using a control circular bar upstream and downstream. Lattice Boltzmann method (LBM) was used to investigate flow over a square cylinder controlled by upstream and downstream circular bar, which is the main novelty of this study. Compared with those available results in the literature, the code for flow over a single square cylinder proves valid. The Reynolds number (Re) based on the width of the square cylinder (D) and diameter of circular bar (d) are 100 for square cylinder, 30 and 50 for different circular bars. Numerical simulations are performed in the ranges of 1≤L∕D≤5 and 1≤G∕D≤5, where L and G are the center-to-center distances between the bar and cylinder. Five distinct flow patterns are observed in the present study. It is found that the maximum percentage reduction in drag coefficient is 59.86% by upstream control bar, and the maximum percentage reduction in r.m.s. lift coefficient is 73.69% by downstream control bar. By varying the distance ratio for the downstream control bar, a critical value of distance ratio is found where there are two domain frequencies.

Keywords: LBM; square cylinder; reduction of drag forces; vortex shedding control; circular bar (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (5)

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DOI: 10.1142/S0129183118500304

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