The effects of wake splitter plates on the flow past a circular cylinder in the range 104&lt;R&lt;5×104

Apelt, C. J.; West, G. S.; Szewczyk, Albin A.

doi:10.1017/s0022112073000649

Cited by 290 publications

(122 citation statements)

References 2 publications

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“…A two-component laser Doppler anemometer ͑LDA͒, i.e., Dantec Model 58N40 with an enhanced FVA signal processor, was used to measure the mean velocities ͑Ū , V , and W ͒ and their fluctuating components ͑u, v, and w͒ across the wake at x / d =2. 5,4,5,6,8,10,15,20,30,40. The coordinate system ͑x , y , z͒ has already been defined in Fig.…”

Section: B Experimental Detailsmentioning

confidence: 99%

Alternative drag coefficient in the wake of an isolated bluff body

Alam

Zhou

2008

Phys. Rev. E

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An alternative drag coefficient C d a ͓=F / ͑ 1 2 U ϱ 2 U ϱ T s ͔͒, is proposed for an isolated bluff-body wake, where F is the drag force on the body per unit length, U ϱ is the free-stream velocity, is the density of fluid, and T s is the vortex shedding period. Theoretical analysis presently conducted indicates that, while the conventional drag coefficient C d ͓=F / ͑ 1 2 U ϱ 2 d͔͒ may be interpreted as the intensity of the mean kinetic energy deficit distributed over the characteristic length of cylinder height d, C d a is the intensity of the mean kinetic energy deficit distributed over the characteristic length of the Karman vortex wavelength U ϱ T s . Therefore, C d a may be considered to be a drag coefficient with the characteristic length given by U ϱ T s , instead of d. As long as a bluff body is isolated, without energy exchange between the cylinder and its support, this drag coefficient is invariant, as confirmed by our experimental data as well as those in the literature, with respect to the bluff-body geometry, angle of attack, and Reynolds number, with a caveat of limited cases examined presently.

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Section: B Experimental Detailsmentioning

confidence: 99%

Alternative drag coefficient in the wake of an isolated bluff body

Alam

Zhou

2008

Phys. Rev. E

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“…From his study, he showed that it decreased for L/D < 1, where L is the plate length, but it increased for 1 < L/D < 2. Apelt et al [16,17] conducted experiments at Re from 1 × 10 4 to 5 × 10 4 to study the influence of the splitter plate. They concluded that the vortex shedding disappeared when L/D > 5.…”

Section: Introductionmentioning

confidence: 99%

Design and CFD Simulations of a Vortex-Induced Piezoelectric Energy Converter (VIPEC) for Underwater Environment

Song

Tian

et al. 2018

Energies

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Abstract:A novel vortex-induced piezoelectric energy converter (VIPEC) is presented in this paper to harvest ocean kinetic energy in the underwater environment. The converter consists of a circular cylinder, a pivoted plate attached to the tail of the cylinder, several piezoelectric patches and a storage circuit. Vortex-induced pressure difference acts on the plate and drives the plate to squeeze piezo patches to convert fluid dynamic energy into electric energy. The output voltage is derived from the piezoelectric constitutive equation with fluid forces. In order to evaluate the performance of the VIPEC, two-dimensional computational fluid dynamics (CFD) simulations based on the Reynolds averaged Navier-Stokes (RANS) equation and the shear stress transport (SST) k-ω turbulence model are conducted. The CFD method is firstly verified for different grid resolutions and time steps, and then validated using simulation and experimental data. The influences of the plate length and flow velocity on the wake structure, the driving force and the performance of the VIPEC are investigated. The results reveal that different parameters reach their peaks at different plate lengths, and the converter has a maximal output voltage of 2.3 mV in a specified condition and the maximal power density reaches 0.035 µW/m 3 with a resistance load of 10 MΩ. The influence of the simulated subcritical Reynolds number on the driving force is not noticeable. The simulation results also demonstrate the feasibility of this device.

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“…The splitter-plate exerts passive control on the dynamics of the near wake (Kwon and Choi 1996;Akilli, Sahin and Filiz Tumen 2005;Tiwari et al 2005) modifying the wake flow in such a manner that VIV suppression is possible. Owing to the presence of the wake splitter-plate, the rolling up of the shear layers is postponed and the subsequent formation of the largescale vortices of the near wake is forced to occur at locations farther downstream (Apelt, West and Szewczyk 1973;Anderson and Szewczyk 1997), thus mitigating the …”

Section: Introductionmentioning

confidence: 99%

Flow-induced vibration characteristics of pivoted cylinders with splitter-plates

Johnstone

Stappenbelt

2015

Australian Journal of Mechanical Engineering

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Experiments have been performed to investigate the characteristics of the flow-induced vibration response of pivoted rigid circular cylinders with attached wake splitter-plates. Motion of the cylinder was constrained to the plane normal to the flow direction and the response characteristics were assessed in regard to the peak angular excursion of the cylinder and the frequency of the cylinder oscillation. Across the range of splitter-plate lengths tested 0.5 < l/D ≤ 3.0, large angular excursions of a galloping-type response were observed together with reduction in the oscillation frequency of the cylinder with increased splitter-plate length.ARTICLE HISTORY

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The effects of wake splitter plates on the flow past a circular cylinder in the range 10⁴<R<5×10⁴

Cited by 290 publications

References 2 publications

Alternative drag coefficient in the wake of an isolated bluff body

Alternative drag coefficient in the wake of an isolated bluff body

Design and CFD Simulations of a Vortex-Induced Piezoelectric Energy Converter (VIPEC) for Underwater Environment

Flow-induced vibration characteristics of pivoted cylinders with splitter-plates

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