The first results of the study of a two-dimensional numerical wave tank in
viscous fluid are presented in this paper. Navier-Stokes equations are solv
ed by an original, fully coupled solver to compute unsteady, incompressible
free surface flows in viscous fluid by second order finite difference sche
mes. Exact nonlinear free-surface boundary conditions and the moving grid t
echnique are used, Generation and propagation of waves in a tank are simula
ted. A numerical damping method has been used for wave absorption at the ou
tlet boundary. First comparisons with experimental results show a good agre
ement for waves of moderate steepness.