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Publications
Liu, ZC. and Guedes Soares, C. (2024), Experimental and numerical studies on the effect of the reinforced tubes on the drag forces of a gravity cage system, Ocean Engineering, Vol. 311, 118780
Vertical tubes are proposed to connect the collar and bottom ring to address the significant deformation of gravity cage nets caused by currents and waves. The goal is to minimize the volume loss of the cages, which reduces the habitat available for fish. This study analyses the effect of vertical tubes on drag forces using numerical and experimental methods. Tests are conducted in a towing tank to measure drag forces and validate a numerical model that employs line elements to simulate the gravity cage behaviour. Comparing the results with those of gravity cages without reinforcement, it is found that the vertical tubes increase the drag force and thicker tubes exacerbate this effect. The study also examines the influence of waves and cages with reinforcement, which exhibit different trends in amplitudes due to tilting at high current velocities. Additionally, the differences between numerical simulations and experiments are discussed. Cages with thin tubes show larger differences than those with thick tubes due to initial bending.
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