THE FUNDAMENTAL STUDY TO REDUCE THE SETTLED AREA OF THE FISH AGGREGATION DEVICES ON THE SEA FLOOR THROWN FROM A SHIP

Yoshiharu Matsumi, Akira Seyama

Abstract


This study aims at clarifying the effective method to set up the fish aggregation device (FAD) thrown down from a ship on the designed position most accurately. The numerical simulation technique is developed to analyzed the behavior of the settling FAD in consideration of the effect of vortices generated behind it. From the systematic calculations for the change of the initial condition on the posture of the FAD at throwing, the effective initial posture of the FAD which reduces the settled area on the sea floor most is investigated. Furthermore, the added-mass coefficient of the settling FAD is numerically analyzed from the kinetic energy of the fluid induced by the settling FAD. The FAD treated in this study is the structure to gather fishes.

Keywords


sea floor; fish aggregation device

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