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Topology of vortex creation in the cylinder wake

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Abstract

We analyze the topology of the two-dimensional flow around a circular cylinder at moderate Reynolds numbers in the regime where the vortex wake is created. A normal form for the stream function close to the cylinder is presented and used to predict the streamline pattern both in the steady and the periodic regime, where two different vortex shedding scenarios are identified. The theoretical predictions are verified numerically. For the vorticity, a very different topology occurs with infinite nested sequences of iso-curves moving downstream. General equations of motion for critical points are derived.

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Authors and Affiliations

  1. Department of Mathematics, Technical University of Denmark, 2800, Kongens Lyngby, Denmark

    Morten Brøns

  2. NKT Flexibles I/S, Priorparken 510, 2605, Brøndby, Denmark

    Anders V. Bisgaard

Authors
  1. Morten Brøns
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  2. Anders V. Bisgaard
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Correspondence to Morten Brøns.

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Communicated by H. Aref

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Brøns, M., Bisgaard, A.V. Topology of vortex creation in the cylinder wake. Theor. Comput. Fluid Dyn. 24, 299–303 (2010). https://doi.org/10.1007/s00162-009-0110-0

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  • DOI: https://doi.org/10.1007/s00162-009-0110-0

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