Development of a fully non-linear circular numerical wave basin based on the HOBEM and omni-controlling sources

A novel fully nonlinear circular numerical wave basin is developed based on potential flow theory and high-order boundary element methods (HOBEM). By controlling the vector input of wave velocity from wave-making sources uniformly distributed on the three-dimensional cylindrical surface, the wave basin is capable of generating waves in all directions. The wave basin is used to simulate nonlinear waves, including uni-directional, multi-directional, and even omni-directional focused waves. These waves as typical cases demonstrate the advantages of the wave basin generating multi-directional, multi-frequency waves and localized distorted waves. The results show that the fully nonlinear free-surface boundary conditions allow the wave basin to capture higher-order wave components during the propagation and deformation of stronger nonlinear waves. The annular artificial damping layer effectively absorbs wave energy from all directions, ensuring the stability of the simulation by mitigating spurious reflections. This fully nonlinear numerical wave basin overcomes the limitations of traditional wave tanks regarding wave direction angles.