Analytical method for scattering of a wave energy device consisting of dual cylinders

A new analytical expression of the diffraction potential for the wave energy device consisting of dual cylinders is obtained by use of constructing special solution based on eigenfunction expansion method due to a plane incident wave.The vertical wave excitation force is calculated based on the diffraction potential.The effort needed for the computation of the diffraction potential is subequal to that of the radiation potential through the procedures of calculating the velocity potential.It is simple to use the method calculating the vertical wave excitation force comparing with that by means of a theorem of Haskind.The results of the wave excitation force calculated by means of the two methods are presented and are the same under different conditions.Otherwise,the variational trend of the vertical excitation force coefficients is analyzed under different conditions.