本論文研究目的係利用二維數值黏性造波水槽模擬單一孤立波與一潛沒式固定垂直薄板之互制作用，而本文所使用之垂直薄板與水面、水槽底部均可使水流通過。為模擬真實流體運動之情形，本研究所利用之數值模式為求解雷諾平均方程式 (RANS) 與 k-ε 紊流閉合模式，並採用流體體積法 (VOF) 追蹤碎波前後自由液面變化之情形，以期可完整探討波浪與結構物之交互作用。為了減少計算區域與模擬時間，採用Torres-Freyermuth et al. (2010) 所建構之主動式造波邊界，在造波的同時亦可吸收反射波，避免二次反射。為了驗證模式之模擬能力，本文與Yasuda et al. (1997) 研究孤立波與半無限長潛堤之實驗結果做驗證。從模擬結果發現，本文所使用之模式具有相當優越之模擬能力。

本文藉著改變孤立波之非線性以及垂直薄板擺放之位置進而進行一系列數值實驗。討論主題包括波浪通過潛沒式結構物碎波前後自由液面之變化，渦流之生成與演化，紊流動能強度，壓力場之變化，以及反射率、透射率、能量消散率等將會在內文中詳細加以討論。

This study presents the numerical results of wave-structure interaction of a solitary wave propagating over a vertical thin and rigid barrier using the two-dimensional volume of fluid (VOF)-type numerical model named COBRAS (COrnell BReaking And Structure). The present numerical model solves the Reynolds Averaged Navier-Stokes (RANS) equations for describing mean flow motion of essentially any Newtonian fluid. The modified k-ε turbulent closure solver for simulating turbulence behaviors is also incorporated. The volume of fluid (VOF) method is used to trace the free surface motion. In this study, the solitary wave is generated through the boundary by specifying both free surface elevation and velocity components. To minimize the computational domain, active wave absorption inflow boundary condition is also included, which allows the inflow boundary for generating desired waves and at the same time absorbing reflected waves (Torres-Freyermuth et al., 2010).

The model simulation capability is first validated against the laboratory experiments of Yasuda et al. (1997), which focused on breaking solitary waves passing through an impermeable shelf. Comparisons between the experimental data and present numerical results are in good agreements.

Then, a set of numerical tests is carried out for a solitary wave propagating over a vertical thin barrier with various wave non-linearity (defined as the ratio of incident wave height to water depth) and two types of thin barrier’s setup. In particular, the characteristics of variation of wave reflection, transmission and dissipation due to flow separation and wave breaking, the vortex generation and evolution in the vicinity of thin barrier, and the turbulent kinetic energy (TKE) behavior are summarized and discussed.

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