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Energy harvesting from passive oscillation of inverted foil

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2021

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Alam, Md. Mahbub
Rehman, Shafiqur
Ji, Chunning
Wang, Hanfeng

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Published

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Physics of Fluids. AIP Publishing. 2021, 33(7), 075111. ISSN 1070-6631. eISSN 1089-7666. Available under: doi: 10.1063/5.0056567

Zusammenfassung

A numerical study is carried out to investigate the energy harvesting from an inverted foil undergoing flow-induced pitching oscillation for reduced velocity Ur  =  1–45 and damping ratio ζ = 0–0.295. The benchmark results with undamped foil (ζ = 0) indicate that the foil does not oscillate for Ur  ≤ 27 but does oscillate with increasing amplitude for 27 < Ur < 34 and with constant amplitude for Ur  ≥ 34. Lissajous diagrams of moment coefficient against the foil displacement are linked to the energy harvesting, showing how Ur and ζ affect the oscillating amplitude, reduced frequency, wake structures, and power exchange between the foil and the flow. The energy harvesting efficiency η up to 15.06% is achieved at Ur  =  37 and ζ = 0.130 with a reduced frequency f* = 0.151 that is used by the cruising aquatic animals. The foil oscillation with negative power enhances the growth of vortices while that with positive power weakens the growth.

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570 Biowissenschaften, Biologie

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ISO 690ALAM, Md. Mahbub, Li-Ming CHAO, Shafiqur REHMAN, Chunning JI, Hanfeng WANG, 2021. Energy harvesting from passive oscillation of inverted foil. In: Physics of Fluids. AIP Publishing. 2021, 33(7), 075111. ISSN 1070-6631. eISSN 1089-7666. Available under: doi: 10.1063/5.0056567
BibTex
@article{Alam2021Energ-66317,
  year={2021},
  doi={10.1063/5.0056567},
  title={Energy harvesting from passive oscillation of inverted foil},
  number={7},
  volume={33},
  issn={1070-6631},
  journal={Physics of Fluids},
  author={Alam, Md. Mahbub and Chao, Li-Ming and Rehman, Shafiqur and Ji, Chunning and Wang, Hanfeng},
  note={Article Number: 075111}
}
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    <dcterms:abstract xml:lang="eng">A numerical study is carried out to investigate the energy harvesting from an inverted foil undergoing flow-induced pitching oscillation for reduced velocity Ur  =  1–45 and damping ratio ζ = 0–0.295. The benchmark results with undamped foil (ζ = 0) indicate that the foil does not oscillate for Ur  ≤ 27 but does oscillate with increasing amplitude for 27 &lt; Ur &lt; 34 and with constant amplitude for Ur  ≥ 34. Lissajous diagrams of moment coefficient against the foil displacement are linked to the energy harvesting, showing how Ur and ζ affect the oscillating amplitude, reduced frequency, wake structures, and power exchange between the foil and the flow. The energy harvesting efficiency η up to 15.06% is achieved at Ur  =  37 and ζ = 0.130 with a reduced frequency f* = 0.151 that is used by the cruising aquatic animals. The foil oscillation with negative power enhances the growth of vortices while that with positive power weakens the growth.</dcterms:abstract>
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