Time-domain wave diffraction of two-dimensional single and twin hulls

The nonlinear diffraction of 2D single and twin hulls are studied by employ ing a mixed Eulerian-Lagrangian model based on a higher-order cubic-spline boundary element solver. Two types of simulations are considered. In the fi rst, waves are generated by a piston-type wave-maker in a rectangular tank and in the second case a nonlinear incident wave is assumed to exist in the tank in which the body is introduced. For the application of this model, t he full nonlinear diffraction problem is recast in terms of a perturbation wave-field. Computations are performed for rectangular and triangular hull geometries. Computed results show significant nonlinearities, particularly in the heave force. The twin hull results show the influence of wave interf erence on the diffraction forces. This interference influences the surge fo rce considerably, but heave force is less affected. (C) 2000 Elsevier Scien ce Ltd. All rights reserved.