Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10712
標題: 防波堤高度對孤立波流場及溯升影響之數值模擬
A Numerical Study on the Influence of a Breakwater to Flow Field and Run-up of Solitary Waves
作者: 陳俊仁
Chen, Chun-Jen
關鍵字: 孤立波;Solitary wave;防坡堤;溯升;breakwater;run-up
出版社: 土木工程學系所
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摘要: 
本研究探討防波堤高度對於孤立波流場以及溯升高度影響。文中探討孤立波通過防波堤時周圍波形、流場變化、防波堤受力情形以及溯升高度之變化。本文係藉FLOW-3D流體動力計算軟體進行模擬,引用 RNG 紊流模式模擬流場中之紊流傳輸,求解非定常雷諾平均方程式(Reynolds Averaged Navier-Stokes Equation, RANS) 之控制方程式。由與Synolakis (1986) 孤立波於斜坡底床傳遞之驗證,顯示本文對孤立波之數值模擬具有很好的精確度。孤立波越過防波堤時,在防波堤向岸側會有類似射流(jet-like flow)的現象發生在基礎平台上方。而在射流發生處以及防坡堤堤頂處有渦度產生,並由於渦流的存在而產生紊流能量(TKE)以及紊流消散(DTKE)。根據研究結果顯示,防波堤高度會影響孤立波在後方斜坡之溯升情形,防波堤高度越高,孤立波溯升高度越低,其波峰到達時間也較慢。且射流現象隨著防波堤高度增高愈呈明顯並有跌水現象產生。而防波堤之受力情形也隨防波堤高度越高,受力越大。

This study investigated on the influence of a breakwater to flow field and run-up of solitary waves. A two-dimensional volume of fluid (VOF) type model called FLOW-3D, which is based on the Reynolds-Averaged Navier-Stokes (RANS) equations and the Renormalized Group k-Ɛ turbulence model, is validated by experimental data from Synolakis (1986). The results show that solitary waves passing through the breakwater, a jet-like flow injects the surface at the lee side. We also notice that the vortex generated at the top and lee-side of the breakwater. The vortex strength increase with the height of the breakwater. And we also observed at the place where vortex generated also induced the turbulent kinematic energy (TKE) and dissipation of turbulent kinematic energy (DTKE). The height of the breakwater also affect the run-up on the slope, breakwater higher the height, solitary wave run-up height is lower, the leading wave arrival time is slower. The forces impinging by the solitary wave on the breakwater is also affected by the breakwater height. The higher height, the greater force.
URI: http://hdl.handle.net/11455/10712
其他識別: U0005-2308201315082400
Appears in Collections:土木工程學系所

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