Analysis of wake region behind bluff body for piezoelectric energy harvester

Mohd Nor Fakhzan Mohd Kazim, Mohammad Rasidi Mohammad Rasani, Mohd. Zaki Nuawi, Zambri Harun, Yap Khang Hau, Mohd Shukry Abdul Majid

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Inspired by enhancement of vortex induced vibration energy harvesting as a green and renewable energy source, several geometry shapes such as cylinder, square, triangle, D shape, and U shape bluff body were studied in terms of vortex shedding frequency, vorticity and pressure difference in order to determine the best bluff body for piezoelectric film. A 2-dimensional computational fluid dynamic (CFD) simulation analysis is carried out with the length and height of bluff body fixed as 0.1 m and air flow used for simulations are 0.0438 m/s, 0.292 m/s, and 0.73 m/s which corresponds to Reynolds number (Re) of 300, 2000, and 5000. Overall, cylinder, triangle, and D shape bluff body gives a higher vortex shedding frequency and Strouhal Number (St) compare to square and U shape. Triangle bluff body was able to maintain the highest vorticity for all three difference air speeds. It is found that maximum vorticity point will move backwards when higher air velocity is simulated. Nevertheless, triangle bluff body gave the highest-pressure difference reading among all tested shapes. In conclusion, triangle shape bluff body is the most suitable shape for inducing vortex shedding to piezoelectric film and it is suggested the length of the piezoelectric beam is between 0.05m and 0.15m.

Original languageEnglish
Pages (from-to)249-263
Number of pages15
JournalJournal of Advanced Research in Fluid Mechanics and Thermal Sciences
Volume55
Issue number2
Publication statusPublished - 1 Mar 2019

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Harvesters
Vortex shedding
Vorticity
Air
Strouhal number
Energy harvesting
Vibrations (mechanical)
Computational fluid dynamics
Vortex flow
Reynolds number
Geometry
Computer simulation

Keywords

  • Bluff body
  • Piezoelectric film
  • Pressure difference
  • Vortex shedding frequency
  • Vorticity
  • Wake region

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

Cite this

Analysis of wake region behind bluff body for piezoelectric energy harvester. / Kazim, Mohd Nor Fakhzan Mohd; Mohammad Rasani, Mohammad Rasidi; Nuawi, Mohd. Zaki; Harun, Zambri; Hau, Yap Khang; Majid, Mohd Shukry Abdul.

In: Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Vol. 55, No. 2, 01.03.2019, p. 249-263.

Research output: Contribution to journalArticle

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