Abstract

The dynamic response of a system of mooring lines, feeder vessel and cage under waves and currents has been investigated. The structure has been modeled by using the fully nonlinear finite element software Orcaflex. To model the cage, a combination of lines, 3 and 6 degree of freedom buoys are. The drag coefficient acting over the net is determined every time step of the simulation based on the relative normal velocity between the element and the fluid flow. The system is kept in place by the use of a SPM mooring line attached to a surface buoy, then connected to the vessel which is coupled to the cage by an umbilical line.