Wave drift forces and moments on two ships arranged side by side in waves

Numerical investigations on transient behaviours of two 3-D freely floating structures by using a fully nonlinear method

“…Even it is taken into account, the results based on 2 nd -order disturbance theory are usually applied [Kashiwagi et al (2005), Sun, Eatock Taylor and Taylor (2010)]. It has been concluded that the nonlinearity in such problems is…”

Analysis of wave resonant effects in-between offshore vessels arranged side-by-side

“…Even though it is true that the forces are larger in the twin bodies configuration, the ten times increase is an over estimation due to the fact that viscous damping is not accounted for by the potential flow solvers. Kashiwagi et al (2005) provided experimental data, in terms of hydrodynamic variable (added mass and radiation damping), diffraction and drift forces, for parametric shapes (a barge and a Wigley hull). In their cases, wide gap values (of the order of one length between perpendiculares) were used, which makes them of limited interest for practical side-by-side operations.…”

“…The results in term of vessels' motion are not considered in the first analyzed case (barge-barge system). For the second analyzed case the Kashiwagi et al (2005) geometries (a wigley hull side-by-side with a barge, at large distance) were considered. In the latter the vessels are fixed and the gap flow was not investigated.…”

“…This commonly raises confidentiality issues, and a simple benchmark is not available. Kashiwagi et al (2005) (already cited since it was used to validate Chen (2005) gap flow modeling technique) provided experimental data, in terms of added mass, damping, diffraction and drift forces for parametric shapes, a barge and a Wigley hull, as represented in Fig 1.12. The geometries' characteristics are similar to the models used in this thesis, but their separation is much wider of one ship length, than a typical side-by-side separations, making it more similar to a replenishment one.…”

Um método de elementos de contorno do domínio do tempo para análise de comportamento no mar de sistemas oceânicos.

“…In this regard, the correct modelling of the fully coupled dynamics of this multi-body problem and also the prediction of the vessels relative motions are important aspects when planning such a complex operation (KOO; KIM, 2005). Indeed, this analysis must also be taken in to account in the design of a mooring system for this kind of operation (KASHIWAGI; ENDO;YAMAGUCHI, 2005).…”