Large eddy simulation of turbulent flow for wall mounted cantilever cylinders of aspect ratio 6 and 10

Imran Afgan, Charles Moulinec, Robert Prosser, Dominique Laurence

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

The flow structure around wall mounted circular cylinders of finite heights is numerically investigated via large eddy simulation (LES). The cylinder aspect ratios (AR) are 6 and 10 and the Reynolds number (Re) based on cylinder diameter and free stream velocity is 20,000 for both cases. The cantilever cylinder mounted on a flat plate is chosen since it gives insight into two entirely different flow phenomena; the tip effects of the free end (which show strong three-dimensional wake structures) and the base or junction effects (due to interaction of flow between the cylinder and the flat plate). Regular vortex shedding is found in the wake of the higher aspect ratio case as was anticipated, along with a strong downwash originating from the flow over the free end of the cylinder, whereas irregular and intermittent vortex shedding occurs in the lower aspect ratio case. Pressure distributions are computed along the length of the cylinder and compared to experimental results. Lift and drag values are also computed, along with Strouhal numbers.

Original languageBritish English
Pages (from-to)561-574
Number of pages14
JournalInternational Journal of Heat and Fluid Flow
Volume28
Issue number4
DOIs
StatePublished - Aug 2007

Keywords

  • Embedded refinement
  • Finite cylinder
  • Free end effect
  • Large eddy simulation
  • Unstructured finite volumes
  • Vortex shedding

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