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Control of the Aerodynamic Forces of a Cantilevered Square Cylinder with Free-End Suction

  • H. F. Wang
  • S. Peng
  • S. Q. Li
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

Steady slot suction is applied near the leading edge of the free end of a cantilevered square cylinder to investigate its effects on the aerodynamic forces. The slot suction significantly changes the flow separation on the free end and also the aerodynamic forces on the entire cylinder span. The best control result appears at the suction coefficient Q = 1 (Q = U s /U, where U s is the suction velocity at the slot, and U is the oncoming flow velocity), with the fluctuation drag and lift reduced by 17.8% and 45.5%, respectively. At Q = 1, the shear flow at the leading edge is weakened and reattaches on the cylinder free end, which results in stronger momentum transport between the free-end shear flow and the wake, thus suppressing the vortex shedding and aerodynamic forces efficiently.

Keywords

Cantilevered square cylinder Aerodynamic forces Flow control 

Notes

Acknowledgements

Financial support from the NSFC through Grants 11472312 is acknowledged.

References

  1. 1.
    Choi H, Jeon WP, Kim J (2008) Control of flow over a bluff body. Annu Rev Fluid Mech 40:113–139MathSciNetCrossRefGoogle Scholar
  2. 2.
    Kawai H, Okuda Y, Ohashi M (2012) Near wake structure behind a 3D square prism with the aspect ratio of 2.7 in a shallow boundary layer flow. J Wind Eng Ind Aerody 30:196–202CrossRefGoogle Scholar
  3. 3.
    Krajnovic S (2011) Flow around a tall finite cylinder explored by large eddy simulation. J Fluid Mech 676:294–317MathSciNetCrossRefGoogle Scholar
  4. 4.
    Sumner D, Heseltine JL, Dansereau OJP (2004) Wake structure of a finite circular cylinder of small aspect ratio. Exp Fluids 37:720–730CrossRefGoogle Scholar
  5. 5.
    Wang HF, Zhou Y (2009) The finite-length square cylinder near wake. J Fluid Mech 638:453–490CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.School of Civil EngineeringCentral South UniversityChangshaChina

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