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Interaction between the near wake and the cross-section variation of a circular cylinder in uniform flow

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Abstract

The flow around a circular cylinder with a cross-section variation is experimentally investigated. Particle Image Velocimetry (PIV) is used to scrutinize the interaction of the cylinder’s wall with its near wake. The Reynolds number based on the cylinder’s diameter and freestream velocity is 80 × 103, corresponding to the upper subcritical flow regime. At a forcing Strouhal number of St f = 0.02, the maximum vorticity level around the cylinder is reduced by more than 50% as compared to its uncontrolled value. The topology of the bulk flow confined between the primary vortical structure and the cylinder surface is modified resulting in substantial drag reduction.

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Acknowledgments

The authors are indebted to the Professors C. Tournier and L. Labraga for their helpful suggestions during the course of this work in LME Laboratory of Valenciennes University.

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Authors and Affiliations

  1. MDF, EMP, Bordj el Bahri, Alger, Algeria

    H. Oualli & S. Hanchi

  2. LTSE, Université des Sciences et de la Technologie (USTHB), Alger, Algeria

    A. Bouabdellah

  3. LME, UVHC, 59313, Valenciennes Cedex 9, France

    R. Askovic

  4. Virginia Commonwealth University, Richmond, VA, USA

    M. Gad-El-Hak

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  1. H. Oualli
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  2. S. Hanchi
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  3. A. Bouabdellah
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  4. R. Askovic
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  5. M. Gad-El-Hak
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Correspondence to H. Oualli.

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Oualli, H., Hanchi, S., Bouabdellah, A. et al. Interaction between the near wake and the cross-section variation of a circular cylinder in uniform flow. Exp Fluids 44, 807–818 (2008). https://doi.org/10.1007/s00348-007-0437-5

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  • DOI: https://doi.org/10.1007/s00348-007-0437-5

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