Dr. Chunrong Liu Professor, Xiamen University of Technology (XMUT), China Mixed Eulerian-Lagrangian methods solve water wave problems by tracking the moving boundaries using Lagrangian method and obtaining the flow field using Eulerian method. One advantage of this type of methods is its ability to deal with highly nonlinear water waves. In this talk, a numerical implementation of mixed Eulerian-Lagrangian methods is used to develop a 2D numerical wave tank for studying wave-structure interactions. The numerical wave tank is used to investigate two problems: (1) nonlinear wave scattering by fixed horizontal plate and (2) wave transmission through a submerged heaving plate.