This study investigated Floating Production Storage and Offloading (FPSO) responses
under wave and current interactions. A higher order boundary element
method (HOBEM) was adopted to probe the behavior of an FPSO. Forces and moment
of an FPSO were studied under wave and current interactions. The simulations
of diffracted and radiated waves were performed in a time domain. Time marching
schemes were used for this time domain calculation. The predictor-corrector(P-C)
method was used. Boundary integral equations were used to solve each problem with
Rankine sources and distributed over the entire calculation domain.
For the far-field boundary condition, Orlanski's truncated open boundary condition
was used for an open truncated boundary condition to prevent reflected waves. The
current effect was considered an explicit term due to being a moving coordinate. Various
current heading angles were also studied. Truncated open boundary, maximum
likelihood method, proper element size and shape, modulation function, and Chebyshev
filtering were studied to avoid diverged solutions.
From our findings, higher order elements fitted a complicated model such as an FPSO. We found that this method required considerably fewer elements than the constant
panel method in order to obtain reasonable outcomes. Using our developed numerical
method, we calculated wave forces and moment, mean drift forces, added mass, and
damping coefficients. Conclusively, HOBEM was found to be more effective and
more reliable in calculating and predicting wave and current influence on an FPSO.
Future studies are needed to develop finer simulation tools for FPSO's large horizontal
- Mercier, Richard Professor