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Author

S. Tucker Harvey

Bio: S. Tucker Harvey is an academic researcher from University of Warwick. The author has contributed to research in topics: Vortex & Flow (mathematics). The author has an hindex of 2, co-authored 2 publications receiving 7 citations.
Topics: Vortex, Flow (mathematics), Wake, Mechanics, Medicine

Papers
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Journal ArticleDOI
TL;DR: In this article, the galloping energy harvester, a curved blade oriented perpendicular to the flow, is capable of producing self-sustained oscillations at uncharacteristically low wind speeds.
Abstract: Aeroelastic energy harvesters are a promising technology for powering wireless sensors and microelectromechanical systems. In this letter, we present a harvester inspired by the trembling of aspen leaves in barely noticeable winds. The galloping energy harvester, a curved blade oriented perpendicular to the flow, is capable of producing self-sustained oscillations at uncharacteristically low wind speeds. The dynamics of the harvesting system are studied experimentally and compared to a lumped parameter model. Numerical simulations quantitatively describe the experimentally observed dynamic behaviour. Flow visualisation is performed to investigate the patterns generated by the device. Dissimilar to many other galloping harvester designs, the flow is found to be attached at the rear surface of the blade when the blade is close to its zero displacement position, hence acting more closely to aerofoils rather than to conventionally used bluff bodies. Simulations of the device combined with a piezoelectric harvesting mechanism predict higher power output than that of a device with the square prism.

17 citations

Journal ArticleDOI
TL;DR: In this article , the authors investigate the swimming dynamics of rainbow trout in the wake of a thrust-producing oscillating hydrofoil and find that despite the higher flow velocities in the inner region of the vortex street, some fish maintain position in this region while exhibiting an altered swimming gait.
Abstract: Many aquatic and aerial animal species are known to utilise their surrounding flow field and/or the induced flow field of a neighbour to reduce their physical exertion, however, the mechanism by which such benefits are obtained has remained elusive. In this work, we investigate the swimming dynamics of rainbow trout in the wake of a thrust-producing oscillating hydrofoil. Despite the higher flow velocities in the inner region of the vortex street, some fish maintain position in this region, while exhibiting an altered swimming gait. Estimates of energy expenditure indicate a reduction in the propulsive cost when compared to regular swimming. By examining the accelerations of the fish, an explanation of the mechanism by which energy is harvested from the vortices is proposed. Similar to dynamic soaring employed by albatross, the mechanism can be linked to the non-equilibrium hydrodynamic forces produced when fish encounter the cross-flow velocity generated by the vortex street.

4 citations

Journal ArticleDOI
TL;DR: In this article, the performance of galloping energy harvesters depends on the geometry of the tip, with the structure of the flow around the tip defining the nature of fluid-structure interaction and hence the potential efficiency of the device.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article , the state-of-the-art advances on flow-induced vibration energy harvesters in terms of their working principles, categories, enhancement methods, model derivation and calculation methods, influence of interface circuits, and energy harvesting efficiency calculation methods are reviewed.

57 citations

Journal ArticleDOI
TL;DR: In this article, a new converter consisting of a circular cylinder on an end-spring is proposed to harness hydrokinetic power from water flow and tides, which is inspired by the trembling of cables with ice attached in barely noticeable winds.

39 citations

Journal ArticleDOI
15 Nov 2019-Energy
TL;DR: In this paper, a galloping piezoelectric energy harvester with an external super capacitor in addition to the small internal PPE was designed to improve the low-velocity wind energy extracting performance.

36 citations

Journal ArticleDOI
05 Dec 2019-Energies
TL;DR: In this article, a galloping piezoelectric energy harvester with a V-shaped groove on the windward side was designed and tested in a wind tunnel by gradually changing the angle of two symmetrical sharp angles of the V-groove.
Abstract: A square cylinder with a V-shaped groove on the windward side in the piezoelectric cantilever flow-induced vibration energy harvester (FIVEH) is presented to improve the output power of the energy harvester and reduce the critical velocity of the system, aiming at the self-powered supply of low energy consumption devices in the natural environment with low wind speed. Seven groups of galloping piezoelectric energy harvesters (GPEHs) were designed and tested in a wind tunnel by gradually changing the angle of two symmetrical sharp angles of the V-groove. The GPEH with a sharp angle of 45° was selected as the optimal energy harvester. Its output power was 61% more than the GPEH without the V-shaped groove. The more accurate mathematical model was made by using the sparse identification method to calculate the empirical parameters of fluid based on the experimental data and the theoretical model. The critical velocity of the galloping system was calculated by analyzing the local Hopf bifurcation of the model. The minimum critical velocity was 2.53 m/s smaller than the maximum critical velocity at 4.69 m/s. These results make the GPEH with a V-shaped groove (GPEH-V) more suitable to harvest wind energy efficiently in a low wind speed environment.

21 citations

Journal ArticleDOI
TL;DR: In this article, the effect of sharp edge square and diamond wakes on the energy harvesting of downstream circular cylinders is investigated through combined experimental and analytical modelings, and the results show that the dissimilar wake is capable of considerably increasing the mechanical power of the circular oscillator but, at the cost of lower efficiency at high flow rates.

15 citations