The Marine Dynamics Lab of Prof. Falzarano is engaged in developing efficient computational analysis approaches to evaluate wave structure interaction. These structures may be ships or may be non-ship-shaped floating offshore platforms. These vessels may operate at zero forward speed or may operate in a current or at non-zero forward speed. These vessels may operate in deep water or shallow water. They may operate by themselves or in close proximity to other vessels. The ideal fluid assumption has been found to be an accurate method of describing wave structure interaction. The zero speed Green function approach has been found to be an efficient method of describing the vessel’s interaction with waves at zero speed and low speed. In order to calculate the steady wave resistance of the ship the nonlinear Rankine source method and the linear Neumann-Kelvin approaches are compared. Optimization of hulls for improved seakeeping performance has be done using these efficient evaluation methods and parametric hull form generation routines. The dynamic stability of both ships and floating offshore platforms has also been done. Examples below show the nonlinear time-varying pressure acting over a ship hull and the amplitude of pressure acting over two ship operating in close proximity.