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Utilising flags to reduce drag around a short finite circular cylinder

Javadi, K ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1080/14685248.2017.1414225
  3. Publisher: Taylor and Francis Ltd , 2018
  4. Abstract:
  5. This paper utilises flags to decrease the drag around a short finite circular cylinder. Wall-adapted large eddy simulation and two-way fluid–structure interaction methods were applied to resolve unsteady turbulent flow structure. The far-field Reynolds number of the current configuration based on the cylinder diameter was chosen to be 20,000. In addition, the length-to-diameter ratio of the cylinder was assumed to be L/D = 2 whereas the flexible flag had a width-to-diameter ratio of W/D = 1.5. The results were compared with the regular short finite circular cylinder and the rigid flagged cylinder in our previous work. The results indicate that utilising flags inside the near-wake region of the cylinder reduces the pressure drag. The physical mechanism of this drag reduction is presented. © 2018 Informa UK Limited, trading as Taylor & Francis Group
  6. Keywords:
  7. Drag force ; FSI and LES-WALE ; Rigid and flexible flag ; Short finite circular cylinder ; Wake region
  8. Source: Journal of Turbulence ; Volume 19, Issue 3 , 2018 , Pages 229-251 ; 14685248 (ISSN)
  9. URL: https://www.tandfonline.com/doi/abs/10.1080/14685248.2017.1414225?journalCode=tjot20