Abstract
In order to conduct a coupling between a wave equation and the Navier-Stokes equation, the vertical distribution of horizontal velocities should be estimated at the connection boundary of them with the variables calculated in the wave equation. The FFT method which is applied to the wave train obtained only after wave calculation can be used to that, though it requires larger number of component waves to approximate the original wave train with higher wave nonlinearity. In this paper, a new method, which estimates the vertical distribution of horizontal velocities under wave calculation, is proposed with applying each nonlinear wave theory to approximation of the variables of wave calculation respecting relative water depth. And an applicability of a one-way coupling from NOWT-PARI to CADMAS-SURF is verified.
