This paper presents a physically based calculation model to simulate the behavior of a cage system considered as moored flexible structures. The flexible structure described is composed of a network of mass points and springs, the behavior of which is calculated using the implicit integration method of the fundamental law of dynamics. Also, to increase the accuracy of calculations, the reduction ratio of flow speed due to shielding effects is acquired by using the flume tank experiments. By applying the reduction ratio of flow speed to the numerical calculation, the calculation accuracy was increased, and it was found that the result of the simulated cage movements was very close to that of the model cage. In addition, the dynamic behavior of an actual fish cage system under the current and waves was simulated.

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