Experimental study of the response of a flexible plate to a harmonic forcing in a flow

Florine Paraz; Christophe Eloy; Lionel Schouveiler

doi:10.1016/j.crme.2014.06.004

Experimental study of the response of a flexible plate to a harmonic forcing in a flow
[Étude expérimentale de la réponse d'une plaque flexible à un forçage harmonique dans un écoulement]

Florine Paraz ¹ ; Christophe Eloy ¹ ; Lionel Schouveiler ¹

¹ Aix–Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, 13384 Marseille cedex 13, France

Comptes Rendus. Mécanique, Volume 342 (2014) no. 9, pp. 532-538.

Résumé
Abstract

La plupart des animaux aquatiques se propulsent grâce au battement d'appendices flexibles. Afin d'avoir une meilleure compréhension de l'effet de la flexibilité sur la performance de la nage, nous avons étudié expérimentalement un système idéalisé. Il consiste en une plaque flexible, immergée dans un écoulement uniforme, dont le bord d'attaque est forcé en un mouvement harmonique transverse à l'écoulement. En augmentant graduellement la fréquence de forçage, des pics de résonance ont été mis en évidence. Outre la fréquence de forçage, on a également fait varier le nombre de Reynolds, la rigidité de la plaque et l'amplitude du forçage. Dans le domaine de paramètres étudié, le principal effet sur la résonance est dû à l'amplitude du forçage, ce qui révèle que les non-linéarités sont essentielles dans ce problème.

Most aquatic animals propel themselves by flapping flexible appendages. To gain insight into the effect of flexibility on the swimming performance, we have studied experimentally an idealized system. It consists of a flexible plate whose leading edge is forced into a harmonic heave motion, and which is immersed in a uniform flow. As the forcing frequency is gradually increased, resonance peaks are evidenced on the plate's response. In addition to the forcing frequency, the Reynolds number, the plate rigidity and the forcing amplitude have also been varied. In the range of parameters studied, the main effect on the resonance is due to the forcing amplitude, which reveals that non-linearities are essential in this problem.

Reçu le : 2014-04-14
Accepté le : 2014-06-10
Publié le : 2014-07-16

DOI : 10.1016/j.crme.2014.06.004

Keywords: Fluid–structure interaction, Flexible plate, Harmonic forcing, Resonance, Non-linearity, Propulsion
Mot clés : Interaction fluide–structure, Plaque flexible, Forçage harmonique, Résonance, Non-linéarité, Propulsion

Affiliations des auteurs :

Florine Paraz ¹ ; Christophe Eloy ¹ ; Lionel Schouveiler ¹

¹ Aix–Marseille Université, CNRS, Centrale Marseille, IRPHE UMR 7342, 13384 Marseille cedex 13, France

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     author = {Florine Paraz and Christophe Eloy and Lionel Schouveiler},
     title = {Experimental study of the response of a flexible plate to a harmonic forcing in a flow},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {532--538},
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     volume = {342},
     number = {9},
     year = {2014},
     doi = {10.1016/j.crme.2014.06.004},
     language = {en},
}

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Florine Paraz; Christophe Eloy; Lionel Schouveiler. Experimental study of the response of a flexible plate to a harmonic forcing in a flow. Comptes Rendus. Mécanique, Volume 342 (2014) no. 9, pp. 532-538. doi : 10.1016/j.crme.2014.06.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.06.004/

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