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Ebrahimi M, Abbaspour M. A Comparative Numerical Study on the Performances and Vortical Patterns of Two Bioinspired Oscillatory Mechanisms: Undulating and Pure Heaving. Appl Bionics Biomech. 2015;2015:325934doi: 10.1155/2015/325934.
Ebrahimi, M., & Abbaspour, M. (2015). A Comparative Numerical Study on the Performances and Vortical Patterns of Two Bioinspired Oscillatory Mechanisms: Undulating and Pure Heaving. Applied bionics and biomechanics, 2015325934. https://doi.org/10.1155/2015/325934
Ebrahimi, Mohsen, and Abbaspour, Madjid. "A Comparative Numerical Study on the Performances and Vortical Patterns of Two Bioinspired Oscillatory Mechanisms: Undulating and Pure Heaving." Applied bionics and biomechanics vol. 2015 (2015): 325934. doi: https://doi.org/10.1155/2015/325934
Ebrahimi M, Abbaspour M. A Comparative Numerical Study on the Performances and Vortical Patterns of Two Bioinspired Oscillatory Mechanisms: Undulating and Pure Heaving. Appl Bionics Biomech. 2015;2015:325934. doi: 10.1155/2015/325934. Epub 2015 May 11. PMID: 27057133; PMCID: PMC4745436.
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Appl Bionics Biomech. 2015;2015:325934. doi: 10.1155/2015/325934. Epub 2015 May 11.

A Comparative Numerical Study on the Performances and Vortical Patterns of Two Bioinspired Oscillatory Mechanisms: Undulating and Pure Heaving.

Applied bionics and biomechanics

Mohsen Ebrahimi, Madjid Abbaspour

Affiliations

  1. Department of Mechanical Engineering, Sharif University of Technology, Tehran 9567-11155, Iran.

PMID: 27057133 PMCID: PMC4745436 DOI: 10.1155/2015/325934

Abstract

The hydrodynamics and energetics of bioinspired oscillating mechanisms have received significant attentions by engineers and biologists to develop the underwater and air vehicles. Undulating and pure heaving (or plunging) motions are two significant mechanisms which are utilized in nature to provide propulsive, maneuvering, and stabilization forces. This study aims to elucidate and compare the propulsive vortical signature and performance of these two important natural mechanisms through a systematic numerical study. Navier-Stokes equations are solved, by a pressure-based finite volume method solver, in an arbitrary Lagrangian-Eulerian (ALE) framework domain containing a 2D NACA0012 foil moving with prescribed kinematics. Some of the important findings are (1) the thrust production of the heaving foil begins at lower St and has a greater growing slope with respect to the St; (2) the undulating mechanism has some limitations to produce high thrust forces; (3) the undulating foil shows a lower power consumption and higher efficiency; (4) changing the Reynolds number (Re) in a constant St affects the performance of the oscillations; and (5) there is a distinguishable appearance of leading edge vortices in the wake of the heaving foil without observable ones in the wake of the undulating foil, especially at higher St.

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