A Generalized Wagner Method for Three-Dimensional Slamming

摘要: Impact between the water and ship, that is, slamming, can cause important global local effects. A numerical method has been applied to predict entry loads on three-dimensional bodies. The problem is solved as aninitial value using boundary element method. Green second identity used represent velocity potential a distribution of Rankine sources dipoles over body surface free surface. stepped up in time information from conditions. kinematic free-surface condition determine intersection at each step. exact used, whereas dynamic condition, Φ = 0, approximated horizontal line not profile. approach presented by Zhao et al (1996) for two-dimensional problems was extended arbitrary bodies this work. An idealized shape, which consists cylindrical mid-body hemispherical ends, studied. wetted calculated with great detail considered be more than elevation away body. Drop tests have carried out verify validate simulation. effect angle also agreement theory experiments good, three-dimensionality documented. computational found robust engineering use computationally less demanding. experimental results vertical force strong oscillatory nature, analyzed simplified hydroelastic model. model gives reasonable representation oscillations force. Reasons observed deviations are Recommendations conducting drop minimal effects presented.