Experimental study of hydrodynamic loads induced by the motion of a vertical circular cylinder with heave plates in proximity of the free surface
Résumé
This study presents an experimental investigation of hydrodynamic loads for surge, heave, and pitch oscillations of a vertical circular cylinder with heave plates. The study considers flow parameters (motion amplitude and frequency), the plate geometry (diameter and porosity), and the proximity of the free surface. A captive model technique is employed to obtain the hydrodynamic loads from the load cell. The load time series are analyzed to identify its harmonic components using Fourier analysis. The results show that the first harmonic is the dominant contributor to the loads in general, while the higher harmonics become more noticeable as motion amplitude increases and the submergence decreases. The added mass and damping coefficients associated with the first harmonic indicate that both the amplitude and frequency strongly influence the heave hydrodynamic coefficients as the plate approaches the free surface. The pitch hydrodynamic coefficients align with the general trend of heave motions. In the surge motion, the added mass depends less on amplitude and more on frequency, while damping is noticeably affected by the amplitude. This highlights the importance of motion frequency and higher harmonic contents, especially in shallow draft configurations where the flow induced by the heave plate interacts with the free surface.
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