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Experimental investigation of flow-induced vibration of a sinusoidally rotating circular cylinder

Published online by Cambridge University Press:  05 June 2018

K. W. L. Wong ,
J. Zhao Open the ORCID record for J. Zhao [Opens in a new window] ,
D. Lo Jacono Open the ORCID record for D. Lo Jacono [Opens in a new window] ,
M. C. Thompson  and
J. Sheridan
K. W. L. Wong
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
J. Zhao*
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
D. Lo Jacono
Affiliation:
Institut de Mécanique des Fluides de Toulouse (IMFT), Université de Toulouse, CNRS, Toulouse, France
M. C. Thompson
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
J. Sheridan
Affiliation:
Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC 3800, Australia
*
†Email address for correspondence: [email protected]
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Abstract

The present experimental investigation characterises the dynamic response and wake structure of a sinusoidally rotating circular cylinder with a low mass ratio (defined as the ratio of the total oscillating mass to the displaced fluid mass) undergoing cross-stream flow-induced vibration (FIV). The study covers a wide parameter space spanning the forcing rotary oscillation frequency ratio $0\leqslant f_{r}^{\ast }\leqslant 4.5$ and the forcing rotation speed ratio $0\leqslant \unicode[STIX]{x1D6FC}_{r}^{\ast }\leqslant 2.0$, at reduced velocities associated with the vortex-induced vibration (VIV) upper and lower amplitude response branches. Here, $f_{r}^{\ast }=f_{r}/f_{nw}$ and $\unicode[STIX]{x1D6FC}_{r}^{\ast }=\unicode[STIX]{x1D6FA}_{o}D/(2U)$, where $f_{r}$ is the forcing rotary oscillation frequency, $f_{nw}$ is the natural frequency of the system in quiescent fluid (water), $\unicode[STIX]{x1D6FA}_{o}$ is the peak angular rotation speed, $D$ is the cylinder diameter and $U$ is the free-stream velocity; the reduced velocity is defined by $U^{\ast }=U/(\,f_{nw}D)$. The fluid–structure system was modelled using a low-friction air-bearing system in conjunction with a free-surface recirculating water channel, with axial rotary motion provided by a microstepping motor. The cylinder was allowed to vibrate with only one degree of freedom transverse to the oncoming free-stream flow. It was found that in specific ranges of $f_{r}^{\ast }$, the body vibration frequency may deviate from that seen in the non-rotating case and lock onto the forcing rotary oscillation frequency or its one-third subharmonic. The former is referred to as the ‘rotary lock-on’ (RLO) region and the latter as the ‘tertiary lock-on’ (TLO) region. Significant increases in the vibration amplitude and suppression of VIV could both be observed in different parts of the RLO and TLO regions. The peak amplitude response in the case of $U^{\ast }=5.5$ (upper branch) was observed to be $1.2D$, an increase of approximately $50\,\%$ over the non-rotating case, while in the case of $U^{\ast }=8.0$ (lower branch), the peak amplitude response was $2.2D$, a remarkable increase of $270\,\%$ over the non-rotating case. Notably, the results showed that the amplitude responses at moderate Reynolds numbers ($Re=UD/\unicode[STIX]{x1D708}=2060$ and $2940$, where $\unicode[STIX]{x1D708}$ is the kinematic viscosity of the fluid) in the present study showed significant differences from those of a previous low-Reynolds-number ($Re=350$) numerical study at similar reduced velocities by Du & Sun (Phys. Fluids, vol. 14 (8), 2015, pp. 2767–2777). Remarkably, in an additional study examining the cylinder vibration as a function of $U^{\ast }$ while the fixed forcing rotary oscillation parameters were kept constant at $(f_{r}^{\ast },\unicode[STIX]{x1D6FC}_{r}^{\ast })=(1.0,1.0)$, the cylinder experienced substantially larger oscillations than in the non-rotating case, and a rotation-induced galloping response was observed for $U^{\ast }>12$, where the amplitude increased monotonically to reach approximately $3.0D$ at the highest reduced velocity ($U^{\ast }=20$) tested. Furthermore, new wake modes were identified in the RLO and TLO regions using particle image velocimetry measurements at selected points in the $f_{r}^{\ast }-\unicode[STIX]{x1D6FC}_{r}^{\ast }$ parameter space.

JFM classification

Wakes/Jets: Vortex streets Wakes/Jets: Wakes
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 848 , 10 August 2018 , pp. 430 - 466
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Copyright
© 2018 Cambridge University Press 

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Wong et al. supplementary movie 1

Phase-averaged vorticity contours showing the 2Po pattern at (fr∗, αr∗) = (1.0, 1.0) in the RLO region of the U∗ = 5.5 case.

Download Wong et al. supplementary movie 1(Video)
Video 3.4 MB

Wong et al. supplementary movie 2

Phase-averaged vorticity contours showing the 2S pattern at (fr∗, αr∗) = (1.0, 2.0) in the U∗ = 5.5 case.

Download Wong et al. supplementary movie 2(Video)
Video 3.7 MB

Wong et al. supplementary movie 3

Phase-averaged vorticity contours showing the 2S pattern at (fr∗, αr∗) = (3.0, 2.0) in the U∗ = 5.5 case.

Download Wong et al. supplementary movie 3(Video)
Video 3.1 MB

Wong et al. supplementary movie 4

Phase-averaged vorticity contours showing the 4S pattern at (fr∗, αr∗) = (3.0, 1.0) in the TLO region of the U∗ = 5.5 case.

Download Wong et al. supplementary movie 4(Video)
Video 3.4 MB

Wong et al. supplementary movie 5

Phase-averaged vorticity contours showing the 4S pattern at (fr∗, αr∗) = (1.0, 1.5) in the RLO region of the U∗ = 8.0 case.

Download Wong et al. supplementary movie 5(Video)
Video 2.4 MB

Wong et al. supplementary movie 6

Phase-averaged vorticity contours showing the 2(Po+S) pattern at (fr∗, αr∗) = (3.0, 1.0) in the TLO region of the U∗ = 8.0 case.

Download Wong et al. supplementary movie 6(Video)
Video 3.1 MB