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Vortex shedding in the flow around two side-by-side circular cylinders of different diameters

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Abstract

In this paper, the 3-D turbulent flow around two side-by-side circular cylinders of different diameters, at sub-critical Reynolds number (Re = 3 900), is numerically simulated by the large eddy simulation (LES). The spacing ratios (T /D) between the two cylinders are considered in four cases (T /D = 1.2, 1.5, 1.8 and 2.7) to study the vortex shedding and turbulent properties in the flow field. The main results are focused on the drag and lift coefficients, the vortex shedding frequency, the coherent structure, and the scale properties. It is shown that when T /D is equal to 1.2, the vortex shedding of the main cylinder is strongly suppressed by the small cylinder, the drag and lift coefficients of the main cylinder are smaller than those in other three cases. While T /D is equal to 1.5, the vortex shedding of the main cylinder can be improved, the drag and lift coefficients of the main cylinder are larger than those in other three cases. The empirical mode decomposition (EMD) method is applied to decompose the velocity signals traced by the LES. It is shown that there is a linear relationship between the mean period and the mode in the semi-log coordinates. The vortex shedding period of the main cylinder is consistent with the period of the restructured coherent structures quantitatively.

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Authors and Affiliations

  1. School of Science, Shanghai Institute of Technology, Shanghai, 201418, China

    Xiang Qiu  (邱翔)

  2. School of Mechanical Engineering, Shanghai Institute of Technology, Shanghai, 201418, China

    Zhen-xiao Bi  (毕贞晓) & Jian-ping Luo  (罗剑平)

  3. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai, 200072, China

    Yu-lu Liu  (刘宇陆)

Authors
  1. Xiang Qiu  (邱翔)
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  2. Zhen-xiao Bi  (毕贞晓)
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  3. Jian-ping Luo  (罗剑平)
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  4. Yu-lu Liu  (刘宇陆)
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Corresponding author

Correspondence to Xiang Qiu  (邱翔).

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 11572203, 11332006), the Innovation Program of Shanghai Municipal Education Commission (Grant No.13YZ124).

Biography: Xiang Qiu (1978-), Male, Ph. D., Professor

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Qiu, X., Bi, Zx., Luo, Jp. et al. Vortex shedding in the flow around two side-by-side circular cylinders of different diameters. J Hydrodyn 29, 470–478 (2017). https://doi.org/10.1016/S1001-6058(16)60758-8

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  • DOI: https://doi.org/10.1016/S1001-6058(16)60758-8

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