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Flow Around Curved Tandem Cylinders

Abstract

The flow around curved tandem cylinders of equal diameter has been investigated for the first time, by means of direct numerical simulations. A convex configuration was used. The nominal gap ratio was L/D = 3.0 and a Reynolds number of 500 was chosen. Due to the change in effective gap ratio along the cylinder axis, there is a variation of tandem flow regimes, from alternating overshoot/reattachment, via stable reattachment, to co-shedding, in this case called gap shedding. The combination of reattachment and gap shedding gives near-zero drag and vertical forces for the downstream cylinder, whereas the corresponding forces on the upstream cylinder are comparable to single curved cylinders. Meanwhile, the opposite is true for the lift forces. A low-frequency variation of horizontal and vertical forces is seen, and this is attributed to a slow variation of the position where gap shedding commences. Finally, the concept of a critical angle is proposed to describe the transition to gap shedding, for a given combination of nominal gap ratio and Reynolds number.
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Category

Academic article

Language

English

Author(s)

  • Tale Egeberg Aasland
  • Bjørnar Pettersen
  • Helge Ingolf Andersson
  • Fengjian Jiang

Affiliation

  • SINTEF Ocean / Skip og havkonstruksjoner
  • Norwegian University of Science and Technology

Year

2022

Published in

Journal of Fluids Engineering - Trancactions of The ASME

ISSN

0098-2202

Volume

144

Issue

12

View this publication at Norwegian Research Information Repository