NUMERICAL STUDY OF ASYMMETRIC EFFECT ON A PITCHING FOIL

Qing Xiao () and Wei Liao ()
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Qing Xiao: Department of Naval Architecture and Marine Engineering, University of Strathclyde, Glasgow, G4 0LZ, UK
Wei Liao: Department of Mathematics and Statistics, Old Dominion University, 4700 Elkhorn Ave, Norfolk, VA 23529, USA

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 10, 1663-1680

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 efficiency reduces as increasing asymmetry. Computed results are further adopted to shed insight into the mechanism of thrust enhancement.

Keywords: Asymmetry; sinusoidal motion; pitching foil; thrust performance; 11.25.Hf; 123.1K (search for similar items in EconPapers)
Date: 2009
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Citations: View citations in EconPapers (5)

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DOI: 10.1142/S0129183109014667

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