Vortex-induced vibration of a rotating sphere

Sareen, Anchal; Zhao, Jisheng; Jacono, David Lo; Sheridan, John; Hourigan, Kerry; Thompson, Mark C.

doi:10.1017/jfm.2017.847

Cited by 50 publications

(18 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The experimental methodologies have been validated in previous related studies (e.g. Nemes et al 2012;Zhao et al 2014a,b;Wong et al 2017;Sareen et al 2018). To provide a brief validation, a study of transverse VIV of a non-rotating cylinder was conducted to compare with previous work by Khalak & Williamson (1997) and Zhao et al (2014b).…”

Section: Experimental Validationmentioning

confidence: 92%

Experimental investigation of in-line flow-induced vibration of a rotating circular cylinder

et al. 2018

Self Cite

View full text Add to dashboard Cite

This study experimentally investigates the in-line flow-induced vibration (FIV) of an elastically mounted circular cylinder under forced axial rotation in a free stream. The present experiments characterise the structural vibration, fluid forces and wake structure of the fluid–structure system at a low mass ratio (the ratio of the total mass to the displaced fluid mass) over a wide parameter space spanning the reduced velocity range $5\leqslant U^{\ast }\leqslant 32$ and the rotation rate range $0\leqslant \unicode[STIX]{x1D6FC}\leqslant 3.5$, where $U^{\ast }=U/(\,f_{nw}D)$ and $\unicode[STIX]{x1D6FC}=|\unicode[STIX]{x1D6FA}|D/(2U)$, with $U$ the free-stream velocity, $D$ the cylinder outer diameter, $f_{nw}$ the natural frequency of the system in quiescent water and $|\unicode[STIX]{x1D6FA}|$ the angular velocity of the cylinder rotation. The corresponding Reynolds number (defined by $Re=UD/\unicode[STIX]{x1D708}$, with $\unicode[STIX]{x1D708}$ the kinematic viscosity of the fluid) was varied over the interval $1349\leqslant Re\leqslant 8624$, where it is expected that the FIV response is likely to be relatively insensitive to the Reynolds number. The fluid–structure system was modelled using a low-friction air-bearing system in conjunction with a free-surface water-channel facility. Three vibration regions that exhibited vortex-induced vibration (VIV) synchronisation, rotation-induced galloping and desynchronised responses were observed. In both the VIV synchronisation and rotation-induced galloping regions, significant cylinder vibration was found to be correlated with wake–body synchronisation within the rotation rate range $2.20\lesssim \unicode[STIX]{x1D6FC}\lesssim 3.15$. Of significant interest, the frequency of the streamwise fluid force could be modulated by the imposed rotation to match that of the transverse lift force, resulting in harmonic synchronisation. Measurements using the particle image velocimetry (PIV) technique were performed to identify the wake structure. Interestingly, the imposed rotation can cause regular vortex shedding in in-line FIV at rotation rates that see suppression of the Bénard–von-Kármán vortex shedding in the case of a rigidly mounted cylinder ($\unicode[STIX]{x1D6FC}\gtrsim 1.75$). There is a monotonic increase in the drag coefficient with rotation rate beyond $\unicode[STIX]{x1D6FC}=2$ for a non-oscillating rotating cylinder. This suggests that the mechanism for sustaining the large rotation-induced galloping oscillations at higher $\unicode[STIX]{x1D6FC}$ is due to a combination of aerodynamic forcing from the locked induced vortex shedding associated with the oscillations, assisted by aerodynamic forcing, evaluated using quasi-steady theory.

show abstract

Section: Experimental Validationmentioning

confidence: 92%

Experimental investigation of in-line flow-induced vibration of a rotating circular cylinder

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, mode II also appears sensitive to disturbances and other factors. For example, the experimental study of Sareen et al (2018a) and the computational study of Rajamuni et al (2018b) found that the mode II response weakens if even weak rotation (in the transverse direction) is imposed on the sphere. In particular, they observed a considerable reduction in the maximum oscillation amplitude and a narrowing of the synchronization regime.…”

Section: Robustness Of Modes I and Iimentioning

confidence: 99%

Vortex dynamics and vibration modes of a tethered sphere

2019

View full text Add to dashboard Cite

“…Dowell & Hall 2001;Hou, Wang & Layton 2012) on this topic, to which the reader may be referred. Some recent interesting works on vortex-induced vibrations of an elastically mounted sphere are also mentioned here; these include Behara, Borazjani & Sotiropoulos (2011), Sareen et al (2018), Rajamuni, Thompson & Hourigan (2018).…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional vibrations of multilayered hollow spheres submerged in a complex fluid

Gan

Carrera

et al. 2019

J. Fluid Mech.

View full text Add to dashboard Cite

Fluid–structure interaction is fundamental to the characteristics of the induced flows due to the motion of structures in fluids and also is crucial to the performance of submerged structures. This paper presents a three-dimensional analytical study of the intrinsic free vibration of an elastic multilayered hollow sphere interacting with an exterior non-Newtonian fluid medium. The fluid is assumed to be characterized by a compressible linear viscoelastic model accounting for both the shear and compressional relaxation processes. For small-amplitude vibrations, the equations governing the viscoelastic fluid can be linearized, which are then solved by introducing appropriate potential functions. The solid is assumed to exhibit a particular material anisotropy, i.e. spherical isotropy, which includes material isotropy as a special case. The equations governing the anisotropic solid are solved in spherical coordinates using the state-space formalism, which finally establishes two separate transfer relations correlating the state vectors at the innermost surface with those at the outermost surface of the multilayered hollow sphere. By imposing the continuity conditions at the fluid–solid interface, two separate analytical characteristic equations are derived, which characterize two independent classes of vibration. Numerical examples are finally conducted to validate the theoretical derivation as well as to investigate the effects of various factors, including fluid viscosity and compressibility, fluid viscoelasticity, solid anisotropy and surface effect, as well as solid intrinsic damping, on the vibration characteristics of the submerged hollow sphere. Particularly, our theoretically predicted vibration frequencies and quality factors of gold nanospheres with intrinsic damping immersed in water agree exceptionally well with the available experimentally measured results. The reported analytical solution is truly and fully three-dimensional, covering from the purely radial breathing mode to the torsional mode to any general spheroidal mode as well as being applicable to various simpler situations, and hence can be a broad-spectrum benchmark in the study of fluid–structure interaction.

show abstract

Vortex-induced vibration of a rotating sphere

Cited by 50 publications

References 51 publications

Experimental investigation of in-line flow-induced vibration of a rotating circular cylinder

Experimental investigation of in-line flow-induced vibration of a rotating circular cylinder

Vortex dynamics and vibration modes of a tethered sphere

Three-dimensional vibrations of multilayered hollow spheres submerged in a complex fluid

Contact Info

Product

Resources

About