The role of separation on the forces acting on a circular cylinder with a control rod

Cicolin, Murilo M.; Buxton, O. R. H.; Assi, Gustavo R. S.; Bearman, P. W.

doi:10.1017/jfm.2021.64

Cited by 24 publications

(27 citation statements)

References 26 publications

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“…In fact Cicolin et al. (2021) recently reported the observation of two such new frequencies, aside from those associated with the sheddings of the main cylinder and the control rod, for a range of positions of the control rod with respect to the main cylinder. These frequencies exactly corresponded to the sum and difference of the frequencies associated with the fundamental shedding modes of the main cylinder and control rod.…”

Section: Introductionmentioning

confidence: 95%

“…In addition to the drag reduction, a number of different flow states were identified depending on the precise position of the control rod relative to the main cylinder (Parezanović & Cadot 2012; Cicolin et al. 2021). These flow states can be characterised by the velocity signal between the cylinder and the rod, which are related to different coherent structures in the system's wake (Cicolin et al.…”

Section: Introductionmentioning

confidence: 99%

“…These flow states can be characterised by the velocity signal between the cylinder and the rod, which are related to different coherent structures in the system's wake (Cicolin et al. 2021). Unlike previous studies, where modification of the forces acting on the main cylinder have been the key area of interest, we focus on the energy exchanges taking place in the wake of the system characteristic of state I, for , as identified by Cicolin et al.…”

Section: Introductionmentioning

confidence: 99%

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Energy exchanges in the flow past a cylinder with a leeward control rod

2022

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We study the energy exchanges between coherent structures and the mean flow in the wake of a cylinder in the presence of a leeward control rod using particle image velocimetry data at Reynolds number ( $Re$ ) $20\times 10^3$ . The shedding of the control rod depends on the oncoming shear layer and hence the downstream interaction of the main cylinder's and control rod's wake strongly depends on the control rod's setting angle ( $\theta$ ). In this work we study this interaction between the shedding modes from the cylinder and control rod at different $\theta$ . New secondary coherent motions with distinct characteristic frequencies appear in the flow field aside from the frequencies associated with the sheddings of the control rod, the main cylinder and its harmonics. A multiscale triple decomposition method is applied to extract the coherent modes associated with each of these frequencies, and the dynamics of the modes are studied using kinetic energy budget equations. The primary shedding modes of the control rod and main cylinder, as well as the harmonics of the main cylinder's shedding modes, are found to be primarily energised by the mean flow at this $Re$ , while the secondary modes are almost entirely energised by the primary modes, similar to the findings of Baj & Buxton (Phys. Rev. Fluids, vol. 2, issue 11, 2017, 114607) for a different multiscale flow configuration. The remarkable similarity in the energy exchange process forming the secondary coherent modes, observed in two different studies, hints at a possible universality in the formation process of these secondary structures in a multiscale flow.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy exchanges in the flow past a cylinder with a leeward control rod

2022

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“…In the latter, the jet coming from one side leads the shear layer on the other side to separate earlier, creating a recirculation region dislocated from the centreline and inducing a large lift coefficient. In Sakamoto and Haniu (1994) or in the previous chapter (Cicolin et al, 2021), for example, the drop in drag force was followed by a surge in lift, keeping the total force magnitude at a level similar to the bare cylinder. For two rods, however, the magnitude of the lift force is not large enough to alter the level of the total force magnitude.…”

Section: State IImentioning

confidence: 98%

“…Section 6.6 describe the bi-stable case and 6.7 summarises the main conclusions of this chapter. Most of this chapter's contents were published in the article "The Role of Separation on the Forces acting on a Circular Cylinder with a Control Rod" (Cicolin et al, 2021).…”

Section: Chaptermentioning

confidence: 99%