Author(s): S. Grilli; M. Sahloul

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Abstract: An irnportant pnint in the study of the stability of coastal structures is the determination of the wave field around these structures. To do that, we developed two numerical methods. The first one is the finite element method based on the Berkhoff radiation-diffraction model where we realize an integration on the water depth. The second one is the boundary element method, applied to the linearized tridimensional radiation-diffraction pro- blem, using the Petrov-Galerkin minimization principle. In the latter, the choice of weighting functions satisfying to a Dirac E quation allows to eliminate the volume integration. In each case, we express the connection between a constant depth outer domain where we resolve exactly the problem. by integral equation using Hankel functions, and the considered inner domain which can be very complex. The finite and boundary elements are isoparametric, linear or quadratic. Computational. examples are presented for the two methods applied to real cases.

DOI:

Year: 1985