• Estimation of critical rotation rates for suppression of steady separation bubble behind a circular cylinder

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    • Keywords

       

      Steady separated flow; attached flow; circular cylinder; low Reynolds number; critical rotation.

    • Abstract

       

      An effort has been made in this paper to numerically estimate the critical rotational speeds for which the steady separation bubble completely disappears behind a circular cylinder. The cylinder is subjected to an unconfined free stream flow, however, fictitious confining boundaries are considered for computationalconvenience. The Reynolds numbers computed from the free stream flow velocity are considered in the range of 10–40. In this range of Reynolds number, the flow around a stationary circular cylinder remains steady and separated with the formation of a recirculation zone through counter-rotating vortices (separation bubble) behind the body. Rotational motion is provided to the cylinder that causes stabilization of the flow field. The separation bubble vanishes and an attached type flow feature is observed. The rotational speeds at which the recirculating zone behind the cylinder completely vanishes in the said range of Reynolds number are considered as the critical rotation rates. The aerodynamic coefficients are obtained for the specific operating conditions and a regimediagram is produced depicting the separated and the attached flows.

    • Author Affiliations

       

      DIPANKAR CHATTERJEE1 2 SOURAV GARAI2

      1. CSIR-Central Mechanical Engineering Research Institute, Durgapur 713209, India
      2. Academy of Scientific and Innovative Research, Ghaziabad 201002, India
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