Abstract
Open boundary condition used in the analysis of wave fields with the boundary element method is discussed. Hamanaka (1995) proposed a new open boundary conditon which is ideally appropriate for any wave condition. But this boundary condition is formulated under an assumption that an opening and two boundaries on both sides of the opening make a straight line. In actual harbors, most of the boundaries on both sides of the opening have a fmite angle. In the present paper, the validity of this condition is examined in detail, comparing with potential matching method. It is confirmed that this open boundary condition is still valid in such configurations of boundaries.
