Control of Turbulent Flow over a Circular Cylinder Using Tabs

Junyoung Seo, Jinhyeok Yun and Jungil Lee ()
Additional contact information
Junyoung Seo: Department of Mechanical Engineering, Ajou University, Suwon 16499, Republic of Korea
Jinhyeok Yun: Department of Mechanical Engineering, Ajou University, Suwon 16499, Republic of Korea
Jungil Lee: Department of Mechanical Engineering, Ajou University, Suwon 16499, Republic of Korea

Mathematics, 2023, vol. 11, issue 4, 1-19

Abstract: In this study, we investigate tabs applied to turbulent flow over a circular cylinder for the reductions of the mean drag and lift fluctuations. Tabs are small and thin passive devices attached to the upper and lower surfaces of a circular cylinder near the flow separation. The Reynolds number considered is R e = 3900, based on the free-stream velocity and cylinder diameter. Large eddy simulations are performed using a dynamic global subgrid-scale eddy-viscosity model. A parametric study is carried out to find the optimal tab configuration for minimizing the mean drag and lift fluctuations. Parameters considered are the height ( l y ) and width ( l z ) of the tabs, and spanwise spacing ( λ z ) between them. With the optimal parameters, the spanwise coherence of the vortex shedding behind the cylinder is effectively disrupted, resulting in three-dimensional vortical structures varying in the spanwise direction. As a result, the strength of the vortex shedding in the wake is successfully weakened, and the mean drag and lift fluctuations are significantly reduced by 14% and 95%, respectively, with the optimal tab configuration of l y / d = 0.2 , l z / d = 0.3 , and λ z / d = 4 , where d is the cylinder diameter.

Keywords: flow control; turbulent flow; flow over a cylinder; drag; lift; passive control (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/2227-7390/11/4/968/pdf (application/pdf)
https://www.mdpi.com/2227-7390/11/4/968/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jmathe:v:11:y:2023:i:4:p:968-:d:1067819

Access Statistics for this article

Mathematics is currently edited by Ms. Emma He

More articles in Mathematics from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().