Numerical investigation on seakeeping performance of SWATH with Three Dimensional Translating-pulsating Source Green Function

摘要

The seakeeping performance of Small Waterplane Area Twin Hull (SWATH) was investigated by the boundary element method based on the Three Dimensional Translating-pulsating Source Green Function (3DTP). Some factors that differ from conventional monohull ships, but may have great influence on SWATH were included in the equations of motion, namely the hydrodynamic interaction between the twin hulls, the viscous damping and the effect of stabilizing fins. Numerical simulations have been carried out to predict the wave loads and motions of several SWATH vehicles. The present method has been validated by comparison with both the strip theory formulation (STF) method and the experiment. The result indicates that the predictions of heave responses from both numerical methods agrees well with that of the experiment at different forward speed, while the discrepancies between numerical methods and the experiment are much more pronounced at pitch motions. Generally, the motions are better predicted by the present method based on 3DTP than by the STF method, particularly for pitch motion.