Browsing by Author "Riches, Graham Paul"

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    Experimental Investigation of Vortex-Induced Vibrations using a Cyber-Physical System
    (2018-09-11) Riches, Graham Paul; Morton, Chris R.; Bauwens, Luc; Zhou, Qi; Wood, David H.
    The dynamic response and wake of a circular cylinder undergoing vortex-induced vibrations (VIV) is investigated experimentally using a cyber-physical force-feedback system and particle image velocimetry (PIV) measurements. The effects of the structural mass ratio and mass-damping on the VIV amplitude and frequency response are investigated at a constant Reynolds number by manipulating the structural mass, stiffness and damping in the cyber-physical system. The extent of amplitude modulations in VIV is investigated and a new metric is proposed to quantify the extent of amplitude modulations. A methodology for extracting relevant flow physics associated with coherent structures in the flow is presented for VIV data. Low-order models (LOM) are proposed to describe the dynamics of the wake in each of the VIV branches based on the evolution of the modal temporal coefficients obtained from the proper orthogonal decomposition (POD). The low-order modelling approach is re fined by including a phase-averaging term to better model cases where significant spatial oscillations of the velocity field occur.