Hydrodynamic interactions and relative motions of two floating platforms with mooring lines in side-by-side offloading operation

摘要: Abstract The hydrodynamic interaction and mechanical coupling effects of two floating platforms connected by elastic lines are investigated using a time-domain multi-hull/mooring/riser coupled dynamics analysis program. Particular attention is paid to the contribution off-diagonal terms on relative motions during side-by-side offloading operation. In this regard, exact method (CMM: combined matrix method) including all vessel line dynamics, 12×12 coefficients in developed. performance typical approximation methods (NHI/No Hydrodynamic Interaction: iteration between vessels without considering effects; SMM/Separated Matrix Method: with partially effects, i.e. ignoring cross-coupling coefficient matrix) also tested for same operation different environmental conditions. numerical examples show that there exists significant discrepancy at sway roll modes methods, which means (off-diagonal block) full play an important role case Therefore, such should be used care. fender reaction forces, exhibit large force contact but no contact, numerically modeled present simulation study.