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Weakly nonlinear analysis of the flutter motion of thin cylinders

Tchoufag, Joël and Fabre, David and Magnaudet, Jacques Weakly nonlinear analysis of the flutter motion of thin cylinders. In: Ercoftac International Symposium on Unsteady separation in Fluid-Structure Interaction, 17 June 2013 - 21 June 2013 (Mykonos, Greece). (Unpublished)

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Official URL: http://www.ercoftac.org/special_interest_groups/41_fluid_structure_interaction/latest_news/unsteady_separation_in_fsi/

Abstract

The nature overflows with examples which prove that buoyancy-driven objects in a viscous medium can result in diverse and exotic trajectories. Among them is found the so-called Zig-Zag (ZZ)path or flutter which we investigate in the present work. The configuration is that of a thin cylinder initially rising/falling vertically in an unbounded fluid otherwise at rest. The problem is parametrized by the aspect ratio (diameter to thickness) X, the moment of inertia I* and Archimedes number (gravitational-velocity-based Reynolds) Ar. For small I*, past studies have reported asupercritical transition from the vertical to the ZZ path at a critical Arc. We show by means of linear and weakly nonlinear analyses that the observed flutter results from the nonlinear saturation of an unstable global mode of the coupled fluid+disk problem.

Item Type:Conference or Workshop Item (UNSPECIFIED)
HAL Id:hal-00918002
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Jacques MAGNAUDET
Deposited On:26 Nov 2013 13:28

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