| The study of wave interaction with marine structures is of particular importance in ocean engineering. The objective of this research is to develop inviscid and viscous flow numerical methods for wave propagation around coastal structures. The numerical wave tank simulation techniques based on the CHAMPS (Chen and Lin, 2000) and Chimera RANS (Chen et al., 1998, 1999) methods were established in this study. The flexibility and effectiveness of the CHAMPS method were demonstrated in Chen and Lin (2000) for linear waves around compound coastal structures, while the present study provided a thorough validation on the accuracy of CHAMPS for wave diffraction, reflection, and refraction problems. In order to account for the vorticity generation and energy dissipations due to large amplitude wave motions, the Chimera RANS method was also generalized to deal with viscous fully nonlinear wave transformations. The numerical scheme of Zhang (1992) for nonlinear potential-flow waves was implemented at the wavemaker to facilitate the generation of permanent-type nonlinear incident waves without the undesirable free wave components. Both the CHAMPS and BANS methods were employed in conjunction with a flexible chimera domain decomposition technique, which is very effective in dealing with complex geometries, compound structures, arbitrary bottom topography, and shorelines. |
