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On the Suppression of Vortex Shedding From Circular Cylinders Using Detached Short Splitter-Plates

[+] Author and Article Information
Behzad Ghadiri Dehkordi

Department of Mechanical Engineering, School of Engineering, Tarbiat Modares University, Tehran, Iranghadirib@modares.ac.ir

Hamed Houri Jafari1

Department of Mechanical Engineering, School of Engineering, Tarbiat Modares University, Tehran, Iranhhjafari@gmail.com

1

Corresponding author.

J. Fluids Eng 132(4), 044501 (Apr 16, 2010) (4 pages) doi:10.1115/1.4001384 History: Received July 12, 2009; Revised February 25, 2010; Published April 16, 2010; Online April 16, 2010

Flow over a circular cylinder with detached short splitter-plates is numerically simulated in order to assess the suppression of periodic vortex shedding. A finite-volume solver based on the Cartesian-staggered grid is implemented, and the ghost-cell method in conjunction with Great-Source-Term technique is employed in order to enforce directly the no-slip condition on the cylinder boundary. The accuracy of the solver is validated by simulation of the flow around a single circular cylinder. The results are in good agreement with the experimental data reported in the literature. Finally, the flows over a circular cylinder with splitter-plate in its downstream (off and on the centerline) are computed in Re=40 as a nonvortex shedding case and in Re=100 and 150 as cases with vortex shedding effects. The same simulations are also performed for the case where dual splitter-plates are in a parallel arrangement embedded in the downstream of the cylinder. The optimum location of the splitter-plate to achieve maximum reduction in the lift and drag forces is determined.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pressure distribution obtained by the present work in comparison with some experimental and numerical data reported in the literature (Re=40 and 100)

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Figure 2

Variation in the drag and lift coefficients in Re=100 and different Z/D and G/D values: (a) drag coefficient and (b) absolute amplitude of the lift coefficient

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Figure 3

Variation in the Strouhal number in Re=100 and different Z/D and G/D values

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Figure 4

Variation in the drag coefficient in Re=100 and different G/D values for both single and dual splitter-plate cases

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