This paper is devoted to the numerical simulation of wave propagation and wave diffraction by an immersed structure in viscous flow. An original approach using a diffracted flow defined as the difference between total and incident flows is followed. The incident flow is defined explicitly using nonlinear potential flow theory; Navier-Stokes equations and nonlinear free surface boundary conditions are solved for the diffracted flow only. This procedure, which is very efficient in terms of computing time and accuracy, was first developed by Ferrant (1996) for 3D nonlinear wave-body interaction in potential theory.
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Division Hydrodynamique Navale, Laboratoire de Mecanique des Fluides, Ecole Centrale de Nantes, 1, rue de la Noe, BP 92101, 44321 Nantes Cedex 3, France;
