Parallel implementations of coupled formulations for the analysis of floating production systems, Part II: Domain decomposition strategies

An integrated methodology for the design of mooring systems and risers

“…Several research works on coupled analysis have been conducted (see for instance [8,12e19]). Recently, Jacob et al [20,21] described and studied alternative formulations (referred as "weak coupling" WkC and "strong coupling" StC) for the fully coupled analysis of FPS. The WkC formulation is focused on the equations of motion of the hull: the coupling between the hydrodynamic model of the hull and the hydrodynamic/structural model of the lines is performed by forces acting on the right-hand side of the hull equations.…”

A reduced integration method for the coupled analysis of floating production systems

“…The numerical model is associated to the StC coupling formulation implemented in the PROSIM program (Jacob et al, 2012a(Jacob et al, , 2012b. The hull is represented by the hybrid Morison/radiationdiffraction hydrodynamic model mentioned in Section 2.1, comprising equivalent cylindrical members with properties devised to adequately represent the displaced volume and the hydrodynamic characteristics of the actual members.…”

“…Finally, it can be remarked that, while the parallel implementations described by Jacob et al (2012aJacob et al ( , 2012b) have led to more efficient "fully coupled" methodologies (where the lines are modeled by FE meshes refined enough to provide, on a single analysis, accurate results for the platform motions and the structural response of the risers), they may depend on more specialized hardware resources such as clusters of computers. On the other hand, the reduced integration method presented here (possibly associated to "hybrid" methodologies such as the described above) may comprise more expedite coupled solution procedures, allowing the feasible use of more simple personal computers, thus contributing to establish a more extensive use of coupled analysis tools on the daily design practice of floating production systems.…”

“…In this context, Jacob et al (2012aJacob et al ( , 2012b described alternative formulations for the coupled analysis of FPS, and presented parallel implementations associated to those formulations. The goal was to obtain improved computational efficiency while maintaining higher levels of accuracy (attained by a full time-domain method and a rigorous representation of the lines by Finite Element models).…”

A time-domain finite element method for seakeeping and wave resistance problems

“…For instance, the classic simulation approaches are based on uncoupled formulations, where the hydrodynamic response of the floater is linearised and can be decoupled from the mooring [117,118]. Recently, coupled simulations have been adopted to solve the seakeeping of FOWT devices, since the dynamic of FOWT offers a high complexity due to the variety of loads and non-linear effects.…”