Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session M14: Aerodynamics: General
8:00 AM–9:57 AM,
Tuesday, November 20, 2018
Georgia World Congress Center
Room: B301
Chair: Vibhav Durgesh, California State University, Northridge
Abstract ID: BAPS.2018.DFD.M14.3
Abstract: M14.00003 : Efficiency enhancement of a self-propelled pitching profile using non-sinusoidal trajectories
8:26 AM–8:39 AM
Presenter:
M. Mekadem
(Ecole Militaire Polytechnique, Algiers, Algeria)
Authors:
M. Mekadem
(Ecole Militaire Polytechnique, Algiers, Algeria)
E. Chihani
(Ecole Militaire Polytechnique, Algiers, Algeria)
H. Oualli
(Ecole Militaire Polytechnique, Algiers, Algeria)
S. Hanchi
(Ecole Militaire Polytechnique, Algiers, Algeria)
A. Bouabdallah
(Universite des Sciences et de la Technologie Houari Boumediene, Algiers, Algeria)
M. Gad-el-Hak
(Virginia Commonwealth University, Richmond, Virginia, USA)
A symmetrical profile is subjected to non-sinusoidal pitching motion. The airfoil has a chord length c=0.006 m and a semi-circular leading edge with a diameter of d=0.001 m. The extrados and intrados are two straight lines that intersect at a tapered trailing edge, and the pitching pivot point is positioned at the leading edge. The pitching frequency is in the range of 1<f<190 Hz, while the tangential amplitude of the flapping trailing edge varies from 18% to 114% of the foil cord. To improve the airfoil propulsive performance, two-dimensional numerical simulations are implemented on FLUENT. The Reynolds number based upon the maximum profile thickness t varies in the range of 35<Re<210, comparable to insect’s Reynolds numbers. The foil movement is executed using a dynamic mesh technique and a user defined function (UDF). The adopted mesh has 70,445 nodes with 5,1960 quadrilateral cells. The results are in good agreement with prior experiments, and, compared to sinusoidal oscillations, show that non-sinusoidal flapping trajectories lead to advancing velocity increase of 550%. Additionally, if improved propulsive efficiency is sought, non-sinusoidal flapping lead to better thrust.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.M14.3
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