Abstract
We present a semi-hollow body as an effective strategy to increase the driving force for vortex-induced vibrations (VIVs) of a circular cylinder. The hollow-body concept is evaluated numerically at Reynolds number Re = 200 and in a range of reduced velocity 3 ≤ Ured ≤ 8 with a mass-spring system released to vibrate in the transverse direction. Our numerical solutions reveal that, compared with solid-cylinder counterparts, the net transverse force is increased significantly through the semi-hollow body. The transverse force acting on the inner surface is found to be developed as a consequence of semi-confined flows driven by the cylinder oscillation. Furthermore, it is shown that the inner force has a phase difference with respect to the force acting on the outer surface. Based on a systematic force analysis, the appreciable increase in the transverse force is attributed to the constructive interference between the inner and outer forces.
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Abbreviations
- t :
-
Time
- m :
-
Mass
- k :
-
Spring stiffness
- c :
-
Damping coefficient
- P i :
-
Position vector
- p :
-
Pressure
- V :
-
Kinematic viscosity
- ω:
-
Vorticity
- f :
-
Oscillation frequency
- f n :
-
Natural frequency
- Re :
-
Reynolds number
- St :
-
Strouhal number
- U red :
-
Reduced velocity
- M red :
-
Reduced mass
- C D :
-
Drag coefficient
- C L :
-
Lift coefficient
- C p :
-
Pressure coefficient
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grants funded by the Korean government (Ministry of Science, ICT, and Future Planning) (No. 2017R1 D1A1B03032117).
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Sungmin Ryu is a faculty member of the Department of Mechanical Engineering, Incheon National University. He received his Ph.D. in Mechanical Engineering from Stanford University. His research interests include fluid-structure interaction (FSI) and turbulence modeling.
Seungmin Kang has been a Ph.D. candidate in Department of Mechanical Engineering at Hanyang University, Seoul, Korea. His research interests include computational fluid dynamics, fluid-structure interaction, and multiphase flows.
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Kang, S., Ryu, S. Passive increase in driving force in vortex-induced vibration of a semi-hollow cylinder for Reynolds number 200. J Mech Sci Technol 34, 2435–2442 (2020). https://doi.org/10.1007/s12206-020-0519-3
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DOI: https://doi.org/10.1007/s12206-020-0519-3