A numerical model is developed to investigate the structural performance and stress
distribution of floating pipes of fish cage subjected to the flow. The modeling
approach is based on the joint use of the finite element method using the shell elements to
simulate the floating pipes and the hydrodynamic force model improved from the Morison’s equation
and lumped-mass method. The hydrodynamic response of the fish cage and forces on the floating pipes
can be obtained by the Morison’s equation and lumped-mass method. The stress and
deformation of the floating pipes can be evaluated using the finite element method. Using an
appropriate iterative scheme, the stress distribution and maximum stress of the floating pipes can
be obtained using the proposed model. To validate the numerical model, the numerical results were
compared with the data obtained from corresponding physical model tests. The comparisons show the
numerical results agree well with the experimental data. On that basis, the simulations of floating
pipes in currents are performed to investigate the maximum stress and the critical locations.
Simulations of the fish cage in different flow velocity are performed. The effect of the velocity
on the deformations and stress of the floating pipes is analyzed. The simulations results show
that the stress and deformations drastically increases with the increase of flow
velocity. Comparing results of floating pipes with different mooring line arrangements
indicates that increasing mooring lines can efficiently lower the stress of the floating
pipes. The simulation of the SPM cage system with multiple net cages in current is preformed and
the results show the middle cage is most dangerous for the tripartite-cage
system
