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Synchronized flutter of two slender flags

Mougel, Jérôme and Doaré, Olivier and Michelin, Sébastien Synchronized flutter of two slender flags. (2016) Journal of Fluid Mechanics, vol. 801. pp. 652-669. ISSN 0022-1120

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Official URL: http://dx.doi.org/10.1017/jfm.2016.451

Abstract

The interactions and synchronization of two parallel and slender flags in a uniform axial flow are studied in the present paper by generalizing Lighthill's Elongated Body Theory (EBT) and Lighthill's Large Amplitude Elongated Body Theory (LAEBT) to account for the hydrodynamic coupling between flags. The proposed method consists in two successive steps, namely the reconstruction of the flow created by a flapping flag within the LAEBT framework and the computation of the fluid force generated by this nonuniform flow on the second flag. In the limit of slender flags in close proximity, we show that the effect of the wakes have little influence on the long time coupled-dynamics and can be neglected in the modeling. This provides a simplified framework extending LAEBT to the coupled dynamics of two flags. Using this simplified model, both linear and large amplitude results are reported to explore the selection of the flapping regime as well as the dynamical properties of two side-by-side slender flags. Hydrodynamic coupling of the two flags is observed to destabilize the flags for most parameters, and to induce a long-term synchronization of the flags, either in-phase or out-of-phase.

Item Type:Article
Additional Information:Thanks to Cambridge University Press editor. The definitive version is available at https://www.cambridge.org/ The original PDF of the article can be found at https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/synchronized-flutter-of-two-slender-flags/632CDD526E0F0C03734E4F0B2A4A5FF6
HAL Id:hal-01562958
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EDF (FRANCE)
Other partners > Ecole Nationale Supérieure de Techniques Avancées - ENSTA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Ecole Polytechnique (FRANCE)
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Deposited By: Jerome MOUGEL
Deposited On:17 Jul 2017 09:22

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