Flow-induced vibrations of a side-by-side arrangement of two flexible circular cylinders
Laboratory experiments with a side-by-side arrangement of two vertical, high aspect ratio (length over diameter) and low mass ratio (mass over mass of displaced fluid) cylinders, pin-jointed at the ends and vibrating at low mode number, were carried out in a free-surface water channel. The dynamic response of the models under two different wake interference situations is presented here. Initially, one of the cylinders was fixed and the other was completely free to move. In a second battery of experiments both cylinders were free to vibrate. A very large parameter space was covered by varying the free-stream flow speeds, the natural frequencies of the system and the separation between the models, allowing the identification of vortex-induced vibrations (VIV) and wake-coupled VIV (WCVIV). Amplitudes, frequencies and phase synchronisation between the models are presented.
© 2011 Elsevier Ltd. Received 15 March 2010; Accepted 23 December 2010; Available online 3 February 2011. Support provided by the European Commission through the Marie Curie IOF actions for individuals (PIOF-GA-2008-219429) is gratefully acknowledged.