Bifurcations of vortex-induced vibrations of a fixed membrane wing at Re $$\le $$≤ 1000

The fluid-structure energy transfer of a tensioned beam of length to diameter ratio 200, subject to vortex-induced vibrations in linear shear flow, is investigated by means of direct numerical simulation at three Reynolds numbers, from 110 to 1,100. In both the in-line and cross-flow directions, the high-wavenumber structural responses are characterized by mixed standing-traveling wave patterns. The spanwise zones where the flow provides energy to excite the structural vibrations are located mainly within the region of high current where the lock-in condition is established, i.e. where vortex shedding and cross-flow vibration frequencies coincide. However, the energy input is not uniform across the entire lock-in region. This can be related to observed changes from counterclockwise to clockwise structural orbits. The energy transfer is also impacted by the possible occurrence of multi-frequency vibrations.

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On the efficiency of energy harvesting using vortex-induced vibrations of cables

Journal of Fluids and Structures ◽

10.1016/j.jfluidstructs.2014.05.004 ◽

2014 ◽

Vol 49 ◽

pp. 427-440 ◽

Cited By ~ 44

Author(s):

Clément Grouthier ◽

Sébastien Michelin ◽

Rémi Bourguet ◽

Yahya Modarres-Sadeghi ◽

Emmanuel de Langre

Keyword(s):

Energy Harvesting ◽

Vortex Induced Vibrations

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Vortex-Induced Vibrations of a Cylinder at Subcritical Reynolds Number

ASME 2011 Pressure Vessels and Piping Conference: Volume 4 ◽

10.1115/pvp2011-57392 ◽

2011 ◽

Author(s):

Yoann Jus ◽

Elisabeth Longatte ◽

Jean-Camille Chassaing ◽

Pierre Sagaut

Keyword(s):

Reynolds Number ◽

Numerical Simulations ◽

Numerical Study ◽

Damping Ratio ◽

Experimental Studies ◽

Cross Flow ◽

Physical Analysis ◽

Arbitrary Lagrangian Eulerian ◽

Vortex Induced Vibrations ◽

Low Mass

The present work focusses on the numerical study of Vortex-Induced Vibrations (VIV) of an elastically mounted cylinder in a cross flow at moderate Reynolds numbers. Low mass-damping experimental studies show that the dynamic behavior of the cylinder exhibits a three-branch response model, depending on the range of the reduced velocity. However, few numerical simulations deal with accurate computations of the VIV amplitudes at the lock-in upper branch of the bifurcation diagram. In this work, the dynamic response of the cylinder is investigated by means of three-dimensional Large Eddy Simulation (LES). An Arbitrary Lagrangian Eulerian framework is employed to account for fluid solid interface boundary motion and grid deformation. Numerous numerical simulations are performed at a Reynolds number of 3900 for both no damping and low-mass damping ratio and various reduced velocities. A detailed physical analysis is conducted to show how the present methodology is able to capture the different VIV responses.

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