The dynamics of a long flexible horizontal circular cylinder in water waves.

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Predictions of the hydrodynamic performance of the wave rotor wave energy device

This paper provides a linear solution for the Wave Rotor, a wave energy device that comprises two parallel counter rotating cylinders in orbital motion. Theoretical results are obtained for the radiated waves generated by the device, and for its efficiency. Comparisons with earlier measurements of radiated waves show very promising agreement.<br/

Hydrodynamic damping of the vertical motion of a horizontal cylinder beneath waves at large scale

Large-scale laboratory measurements are presented of the hydrodynamic damping of the vertical oscillations of a circular cylinder beneath waves, where the wave crests are parallel to the cylinder axis. In two series of tests, the Stokes parameter ? was 647 000 and 997 000, and the Keulegan Carpenter number of the cylinder motion was in the range 0·01–0·1. Observations of the decaying motion of the cylinder, and of steady-state oscillations generated by continuous force excitation, were in reasonable agreement with the vector form of the relative velocity Morison equation with constant coefficients. In some conditions, the motion of the cylinder became phase locked to the wave-induced flow, at an integer frequency ratio

Transient motion of a vertical cylinder: Measurements and computations of the free surface

In recent years there have been concerns in the offshore oil industry over the violent motions of the water surfaceproduced around a vertical cylinder by relatively large steep waves (say height/diameter = 1, height/length =0.1)