72th Annual Meeting of the APS Division of Fluid Dynamics (November 23, 2019 — November 26, 2019)

V0025: Dynamics and Control of Flow around Circular Cylinder

  • James Ramsay, University of Canterbury
  • Mathieu Sellier, University of Canterbury
  • Wei Hua Ho, University of South Africa
DOI: https://doi.org/10.1103/APS.DFD.2019.GFM.V0025

The flow around a circular cylinder is a simple flow and has been studied for a long time. However, like Isaac Newton describing the motion of a falling apple, it is often by gaining a deeper understanding of simple phenomena that we learn useful lessons for wider contexts.

This video shows some of the results of numerical simulations that modelled laminar flow around a circular cylinder. The separation of the flow and the formation of the wake were controlled by suction through the cylinder surface. The suction profiles were optimised at a variety of Reynolds Numbers to determine how the separation can most effectively be prevented. The optimised profiles - in particular the centre of suction and strength, were found to be dependent on the Reynolds number (or alternatively, on the original separation angle) with a predictable trend.

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