Simulation of Focused Waves Using a Free-Surface Capturing Code

In this paper, the focused wave groups, which have been used in physical flumes for testing the survivability of offshore installations under extreme wave conditions, are generated numerically by using a recently developed two-fluid free-surface capturing code (AMAZON-SC). The finite volume based method solves Navier-Stokes equations for a variable density fluid on a Cartesian grid and the movement of the wave maker (a piston-type paddle) is simulated efficiently and accurately by adopting a generic cut cell mesh approach for moving boundaries. Two test cases of the focused wave group with different frequency bandwidths have been calculated and results are in generally good agreements with the relevant experimental data.