Abstract
This paper presents a newly developed numerical analysis program for second-order diffraction waves around a general shape structure using Green's function. In the developed program, the direct method to calculate the second-order velocity potential is used. A program based on the indirect method, but without considering second-order diffraction potential was previously developed. However, the indirect method does not allow the calculation of the pressure distribution nor the free surface elevation. Therefore, in this paper, a new approach using the direct method for calculation of second-order forces is numerically implemented and its results are compared with those obtained from the indirect approach. In the newly developed program, bi-directional waves with two different frequencies are considered.
