裙礁流場之數值分析與消能特性之探討

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姓名

黃培軒(Pei-Hsuan Huang) 查詢紙本館藏

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水文與海洋科學研究所

論文名稱

裙礁流場之數值分析與消能特性之探討
(Numerical Simulation on the Flow Field and Energy Dissipation by the Fringing Reef)

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摘要(中)

裙礁為一種典型之珊瑚礁型式，主要由珊瑚礁灘(reef flat)和珊瑚礁坡(reef slope)所組合而成。其中珊瑚礁灘通常存在於較淺之海岸邊並且毗鄰陸地，其坡度較礁坡為平緩，可對波浪有消能效果。珊瑚礁坡離海岸較遠，坡度亦較為陡峭，因波浪由深水段傳遞到較淺之珊瑚礁灘上時經常直接造成波浪反射和伴隨碎波之產生。為了深入了解能量消散機制，本研究透過理想化珊瑚礁之實驗與數值模擬來探討其流場特性。在數值模擬方面，採用Large-Eddy Simulation (LES) 紊流模型並搭配Volume of Fluid (VOF) 法，為精準描述實驗室造波機所產生之入射波，本研究使用moving-solid algorithm (MSA)模擬造波機推板之運動，並針對無ridge之案例進行三維數值分析。
其結果顯示，數值模擬與實驗比對良好，自由液面和半水深之流速比對中，流速誤差均於5%以內。在沒有ridge之不同前斜坡坡度之案例中顯示，1:10之前斜坡能量消散率較1:1前斜坡之能量消散率大12%。在沒有ridge不同之靜水深給予相同之波浪條件下，靜水深之改變對能量消散率並無太大之影響，靜水深0.4公尺之能量消散率僅較靜水深0.5公尺之能量消散率大1.2%。在固定相同之靜水深條件下，本模擬給予不同週期之波浪條件，其能量消散率隨將週期增長。無ridge之三維模擬結果呈現波浪破碎後之三維現象，且相較於二維模擬，波速及波高之比對上皆小約5%，而能量消散率部分則小約1%。詳細之分析結果與方法將於論文全文中呈現。

摘要(英)

The fringing reef is a common type of coral reef which is mainly by the reef flat and reef slope. The reef flat is usually found in the shallow water area with a mild slope. Because the reef flat is adjacent to land, it plays an important role on dissipating the wave energy. Reef slope, on the other hand, is often quite steep which reflects the wave energy directly and introducing wave breaking. In order to have profound understanding on the energy dissipating mechanism, we idealize the reef setup and explore the flow field numerically. We performed the numerical simulation by solving the Large-Eddy Simulation (LES) model with volume of fluid (VOF) interface tracking algorithm. To accurately describe the incident wave generated by a piston-type wavemaker, we utilized the moving-solid algorithm (MSA). Furthermore, the case without a ridge was chosen for demonstrating the 3-D effect of the flow field. By comparing the numerical result and the experimental data, the differences of flow velocity at middle depth and free surface-elevation were less than 5%. Energy dissipation rate for 1:10 slope is 12% greater than on the 1:1 slope. Dissipation rate of the still water depth 0.4m is 1.2% greater than the one of the still water depth 0.5m. Also, Long wave period has lager energy dissipation rate. In the case of 3-D simulation, the results show that the 3-D effect was observed after wave breaking. The differences between the 2-D and 3-D are less than 5% in terms of both the wave height and velocities. Energy dissipation rate between 2-D and 3-D simulations is less than 1%. Detailed analysis are shows in the context.

關鍵字(中)

★ 裙礁
★ 大渦模擬
★ 能量消散
★ 流體體積法
★ 珊瑚礁脊
★ 三維模擬

關鍵字(英)

★ fringing reef
★ LES
★ energy dissipation rate
★ VOF
★ ridge
★ 3-D simulation

論文目次

摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 VIII
第一章緒論 1
1-1 前言及研究動機 1
1-2 研究方法 4
1-3 本文架構 5
第二章文獻回顧 7
2-1 裙礁消能之文獻回顧 7
2-2 數值方法研究裙礁之文獻回顧 8
2-3 海岸消能之文獻回顧 10
2-4 自由液面描述法之文獻回顧 10
第三章模式簡介與數值方法 14
3-1 模式簡介 14
3-1-1 統御方程式（Governing Equations） 14
3-2 大渦模擬模式（Large Eddy Simulation, LES） 15
3-3 流體體積法（Volume of fluid method, VOF） 17
3-4 有限體積法（Finite Volume Method, FVM） 19
3-5 部份網格法（Partial-cell Treatment, PCT） 20
3-6 海綿層消波（Sponge Layer） 21
3-7 投影法（Projection Method） 22
3-8 移動固體法（Moving Solid Algorithm, MSA） 23
第四章裙礁實驗尺度模擬 28
4-1 數值模式驗證 28
4-1-1 下游海綿層消能區消能檢定 28
4-1-2 邊牆效應分析 29
4-1-3 移動固體法數值造波結果驗證 29
4-2 裙礁模擬問題描述 29
4-3 實驗設置與數值模式設定 30
4-3-1 實驗室設置 30
4-3-2 數值模式設置 31
4-4 結果驗證 32
4-4-1 不含ridge之驗證與流場分析 32
4-4-2 含ridge之驗證與流場分析 33
4-4-3 有無ridge之流場探討 35
4-5 裙礁參數影響分析 38
4-5-1 前斜坡坡度分析 38
4-5-2 靜水深之分析 38
4-5-3 週期之分析 39
4-5-4 ridge長度之分析 39
4-6 三維效應之模擬與分析 40
第五章結論與建議 95
5-1 結論 95
5-2 建議 97
參考文獻 98

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指導教授

吳祚任(Tso-Ren Wu)

審核日期

2014-8-21

推文