Proposal for consideration of inertial and drag parcels to deformable anchor lines in catenary configurations

Resumo

This work proposes the construction of an alternative method for dynamics analysis of deformable
anchor lines, in free catenary configuration, linked to the floating units of oil exploration systems. Among the
various methods used for numerical simulation of offshore lines, the catenary and finite element methods are the
most widely used. The catenary method generates a quick analysis and not so faithful to the dynamics exercised
by the line, while the finite element method proves greater fidelity in exchange for high computational cost.
Observing the problems of mechanical representativeness and computational cost present in the catenary and finite
element methods, respectively, the aim is to develop a methodology to which the computational cost is reduced
and that provides results more consistent with the physical problem, respecting the mechanics of deformable solids.
For that, this work proposes, after reviewing formulations of structures in deformable cables and finite element
method, to combine the positive aspects of each modeling mode and incorporate the environmental actions,
providing data related to the line, such as its geometry and traction in the fairlead. Thus, a study about the
representativeness of the model was executed through dynamics analysis, which showed promising results through
the developed methodology.