Experimental investigation of vortex-induced vibrations of a circular cylinder under rotary oscillations
Résumé
A new experimental device to study vortex-induced vibrations (VIV) of a cylinder in a free-surface water channel is presented. The cylinder is elasticallymounted on an air-bearing platform and is free to oscillate in the cross-flow direction. Two DC motors are coupled to the oscillating mass and allow : (i) to simulate for positive or negative damping through forcing, (ii) to measure the position and speed of the cylinder, (iii) to force the cylinder into a rotative motion. The dynamical response of the system has a typical two or three branch response amplitude depending on the damping ratio. One case of intensification of VIV oscillations with rotary oscillations is detailled. Flow velocity surveys obtained with Particle Image Velocimetry (PIV) are reported to compare the different VIV wake modes.
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