APPLICATION OF DIRECT BOUNDARY INTEGRATION METHOD TO WAVE DIFFRACTIONBY SUBMERGED BODIES

The diffraction of waves due to the presence of submerged objects in t he ocean environment is solved by a relatively novel approach involvin g the direct boundary integration method (DBIM). Firstly, the method i s tested for the case of a submerged circular cylinder and compared wi th the conventional boundary element method (BEM) results. The agreeme nt between the results using this method and the BEM is good. Further, the DBIM has been applied to the case of a submerged horizontal plate for which the horizontal and vertical force coefficients are computed and compared with a semi-analytical solution using the matched eigenf unction expansion method (EFEM). It is found that the computed results using DBIM are in good agreement with those of EFEM and BEM. Further, the DBIM is found to be computationally more efficient than the BEM f or the water wave diffraction problems presented in this paper.