Figure 1 shows a schematic view of the BBDB type model. A
calculation domain is divided into domains, which include an
air chamber OWC. The wave power is absorbed by the OWC in
front of the floating body. We take a Cartesian coordinate system
with x horizontal and z positive upward, and the origin on the
mean free surface, as shown in Fig. 1.
The basic equations are the linearized Bernoulli equation,
which omits the convection term by assuming the slow motion,