Numerical study of asymmetric effect on a pitching foil

Qing Xiao, Wei Liao

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

This study investigates numerically the effect of asymmetric sinusoidal oscillating motion on the propulsion performance of a pitching foil and attempts to gain insight in whether the low thrust generated by pure pitching could be improved by asymmetric motion. The propulsion performance and flow structure are explored by solving the unsteady Navier{Stokes equations. Computations are conducted for a range of oscillation frequency, pitching amplitude, and asymmetry. The results show that the higher asymmetry can induce the stronger reverse Von Karman vortex in the wake, which in turn leads to the increased thrust. However, the propulsion effciency reduces as increasing asymmetry. Computed results are further adopted to shed insight into the mechanism of thrust enhancement.
LanguageEnglish
Pages1663-1680
Number of pages18
JournalInternational Journal of Modern Physics C
Volume20
Issue number10
Early online date16 Jun 2009
DOIs
Publication statusPublished - Oct 2009

Fingerprint

propulsion
Metal foil
Propulsion
Asymmetry
Numerical Study
foils
thrust
Motion
Wake
asymmetry
low thrust
Vortex
Reverse
Navier-Stokes Equations
Enhancement
Oscillation
Flow structure
wakes
Navier-Stokes equation
Navier Stokes equations

Keywords

  • asymmetry
  • sinusoidal motion
  • pitching foil
  • thrust performance

Cite this

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Numerical study of asymmetric effect on a pitching foil. / Xiao, Qing; Liao, Wei.

In: International Journal of Modern Physics C, Vol. 20, No. 10, 10.2009, p. 1663-1680.

Research output: Contribution to journalArticle

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AB - This study investigates numerically the effect of asymmetric sinusoidal oscillating motion on the propulsion performance of a pitching foil and attempts to gain insight in whether the low thrust generated by pure pitching could be improved by asymmetric motion. The propulsion performance and flow structure are explored by solving the unsteady Navier{Stokes equations. Computations are conducted for a range of oscillation frequency, pitching amplitude, and asymmetry. The results show that the higher asymmetry can induce the stronger reverse Von Karman vortex in the wake, which in turn leads to the increased thrust. However, the propulsion effciency reduces as increasing asymmetry. Computed results are further adopted to shed insight into the mechanism of thrust enhancement.

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