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Bluff-Body Wakes, Dynamics and Instabilities pp 127–130Cite as

Numerical Analysis of the Instabilities in the Near Wake of a Circular Cylinder at Low Reynolds Numbers

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Summary

Numerical experiments are described which followed the experimental observation of the production of an oscillatory wake by the insertion of a control rod on the centre line of the near wake at Reynolds numbers, Re, (based on diameter, d) less than the critical Re. The computed values of CL grew exponentially for a range of positions of the control on the wake axis.

Results are presented which show that the driving force at Re < Recrit is small fluctuations in the near wake which convect downstream. Their interaction with the control rod produces oscillations at the control rod which feed back to the cylinder to initiate the exponential growth of CL. At Re > Recrit the exponential growth of CL takes place without a control in the wake. The growth rate as a function of Re is determined and compared with other work.

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References

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Author information

Authors and Affiliations

  1. Department of Engineering, University of Manchester, UK

    J. H. Gerrard

Authors
  1. J. H. Gerrard
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Editor information

Editors and Affiliations

  1. Institut für Angewandte Mechanik und Strömungsphysik, Universität Göttingen und Max-Planck-Institut für Strömungsforschung, Bunsenstraße 10, 37073, Göttingen, Germany

    Helmut Eckelmann

  2. Department of Aeronautics, Imperial College of Science, Technology and Medicine, SW72BY, South Kensington, London, UK

    J. Michael R. Graham

  3. Laboratoire d’Hydrodynamique (LADHYX), Ecole Polytechnique, 91128, Palaiseau Cedex, France

    Patrick Huerre

  4. Mechanical, Aerospace and Nuclear Engineering Dept., University of California, Los Angeles, 405 Hilgard Ave., 90024-1597, Los Angeles, CA, USA

    Peter A. Monkewitz

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© 1993 Springer-Verlag Berlin Heidelberg

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Gerrard, J.H. (1993). Numerical Analysis of the Instabilities in the Near Wake of a Circular Cylinder at Low Reynolds Numbers. In: Eckelmann, H., Graham, J.M.R., Huerre, P., Monkewitz, P.A. (eds) Bluff-Body Wakes, Dynamics and Instabilities. International Union of Theoretical and Applied Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-00414-2_30

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  • DOI: https://doi.org/10.1007/978-3-662-00414-2_30

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-00416-6

  • Online ISBN: 978-3-662-00414-2

  • eBook Packages: Springer Book Archive

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