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research-article

Numerical investigation of the effect of motion trajectory on the vortex shedding process behind a flapping airfoil

[+] Author and Article Information
Ali Boudis

LTSE, Faculty of Physics, University of Science and Technology, Houari Boumediene (USTHB), BP 32 El-Alia,16111, Algiers, Algeria
aboudis@usthb.dz

Annie Claude Bayeul Laine

Arts et Métiers ParisTech,LMFL, 8 boulevard Louis XIV, 59046 Lille, France
Annie-Claude.BAYEUL-LAINE@ensam.eu

Ahmed Benzaoui

LTSE, Faculty of Physics, University of Science and Technology, Houari Boumediene (USTHB), BP 32 El-Alia,16111, Algiers, Algeria
a1benzaoui@yahoo.fr

Hamid Oualli

LMF, Ecole Militaire Polytechnique, B.P 17 Bordj-el-Bahri, 16046, Algiers, Algeria
houalli@gmail.com

Ouahiba Guerri

Centre de Développement, des EnergiesRenouvelables, CDER, B.P 62, Route de l’Observatoire 16340, Bouzareah, Algiers, Algeria
o.guerri@cder.dz

Olivier Coutier-Delgosha

Virginia Tech, Kevin T. Crofton Dept., of Aerospace & Ocean Eng., Blacksburg VA 24060, USA
olivier.Coutier-Delgosha@ensam.eu

1Corresponding author.

ASME doi:10.1115/1.4042175 History: Received February 15, 2018; Revised November 30, 2018

Abstract

The effect of non-sinusoidal trajectory on the propulsive performances and the vortex shedding process behind a flapping airfoil is investigated in this study. A movement of a rigid NACA0012 airfoil undergoing a combined heaving and pitching motions at low Reynolds number (Re = 11; 000) is considered. An elliptic function with an adjustable parameter S (flattening parameter) is used to realize various non-sinusoidal trajectories of both motions. The two-dimensional unsteady and incompressible Navier-Stokes equation governing the flow over the flapping airfoil is resolved using the commercial software STAR CCM+. It is shown that the non-sinusoidal flapping motion has a major effect on the propulsive performances of the flapping airfoil. Although the maximum propulsive efficiency is always achievable with sinusoidal trajectories. Non-sinusoidal trajectories are found to considerably improve performance: a 110% increase of the thrust force was obtained in the best studied case. This improvement is mainly related to the modification of the heaving motion, more specifically the increase of the heaving speed at maximum pitching angle of the foil. The analysis of the flow vorticity and wake structure also enables to explain the drop of the propulsive efficiency for non-sinusoidal trajectories.

Copyright (c) 2018 by ASME
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