OPEN, PARTIAL REFLECTION AND INCIDENT-ABSORBING BOUNDARY-CONDITIONS IN WAVE ANALYSIS WITH A BOUNDARY INTEGRAL METHOD

A wave field with constant depth and a linearized water surface condit ion is governed by the Helmholtz equation. This equation can be solved numerically with a boundary integral method implemented by Green's in tegral equation. In this method, suitable boundary conditions should b e established corresponding to the type of boundary. The present paper proposes new boundary conditions for open boundary, partial reflectio n boundary and incident-absorbing boundary. These conditions do not de pend on the incident angle, the number of wave components and the type of wave (plane and cylindrical). Numerical results show the complete validity of these conditions.