Numerical Study of Solitary Wave Interaction with a Submerged Slotted Barrier

孤立波與潛沒式孔隙板互制之數值研究

吳昀達(Yun-Ta Wu) ； 蕭士俊(Shih-Chun Hsiao) ； 林螢俞(Ying-Yu Lin)

《海洋工程學刊》 13卷1期 (2013/03) Pp. 1-13

https://doi.org/10.6266/jcoe.2013.1301.01

摘要

本文研究目的係利用二維黏性數值造波水槽模擬單一孤立波與一潛沒式孔隙板之互制。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，以期可完整探討波浪與結構物之交互作用。本文藉著改變板式結構物在水中的位置與其孔隙率進行一系列數值試驗。探討主題包括結構物孔隙率及不同水中位置對自由液面、速度場與渦度場的影響、以及位於結構物附近之流體質點的軌跡變化。另外亦利用能量積分法估算潛沒式孔隙板在孤立波作用下之反射率、透射率與能量消散率。

關鍵字

孤立波 ； 孔隙板 ； 能量消散 ； RANS模式

並列摘要

We study the interaction between an isolated solitary wave and an underwater slotted barrier numerically. With the advantages on enhancing water circulations and sediment movements, the slotted barrier is considerably more cost effective and less environmental impact than the conventional hard structures. The numerical results are calculated by a two-dimensional volume of fluid (VOF)-type model which solves the Reynolds-Averaged Navier-Stokes (RANS) equations and the nonlinear k-ε turbulence closure model. We discuss the effect of porosity and vertical locations of slotted barrier on the free surface elevation, velocity and vorticity fields. Then, the attentions also paid on tracing the trajectories of fluid particles around the object to help understand possible sediment movements for suspended loads and on evaluating the wave reflection, transmission, and dissipation coefficients using the energy integral method.

並列關鍵字

solitary wave ； slotted barrier ； energy dissipation ； RANS model