海洋內波現象近年來為海洋學者熱門研究的議題，且國內外從事內波研究，大都以現場觀測及實驗室試驗為主，但受限於天候、成本及安全性種種因素，較不易取得大量、可信及準確的資料，近年來由於高速處理器的進步及數值演算法的精進，使用數值模擬來探討海洋內波運動已成為熱門趨勢。
本研究針對 ANSYS FLUENT 之數值模式作精確度測定及分析，並利用ANSYS FLUENT 模擬與陳(2004)和郭(2005)相同試驗的內波傳遞過程，來驗證本研究數值模式的準確性、可信度及應用廣泛程度，隨後利用ANSYS FLUENT 數值模式模擬孤立內波之生成及內波通過時與表面波相互影響關係，以及探討通過不同底床地形時所形成的渦流效應與機制。經由數值模擬結果歸納與分析得知，海洋內波在傳遞的過程中，由於在交界面附近會有劇烈的水體交換混合運動，造成海水水體劇烈輻合、擴散和強流，使其在自由表層產生短暫流，進而發現內波波形與表面波波形起伏互為上下相反，且薄層水體的流速大於厚層水體的流速，內波水體之運動速度為非對稱分佈，又透過通過不同底床地形之模擬結果瞭解到局部的渦旋、紊流、壁面磨擦及流體黏滯性為內波能量產生消散的物理機制之一。

In recent years, the phenomenon of ocean internal waves is a popular research topic of great concern to oceanographer, and Engaged in internal wave study at home and abroad, mostly in the field observations and laboratory tests based, but is subject to weather conditions, cost and safety factors, the more difficult to obtain a large number of , credible and accurate information, in recent years because of advances in high-speed processors and improved numerical algorithms, using numerical simulation to explore the motion of ocean internal waves has become a popular trend.
In this study, for accurate determination and analysis of numerical model of ANSYS FLUENT, and using ANSYS FLUENT to simulate the test of the internal waves propagation process is as same as chen(2004) and Guo(2005), to verify the accuracy of numerical models in this study, the degree of credibility and widely, then using ANSYS FLUENT numerical model simulate solitary internal waves generated and pass through relationships with free surface waves, and to explore the vortex effect and mechanism through different seabed topography formed. Summarized by the numerical simulation results and analysis that, Ocean internal waves during the transfer, because in the vicinity of the interface will be strong mixing water exchange movement, and causing severe convergence, diffusion and strong flow, it will produce a short free-surface flow, thereby found that internal wave-shaped and free surface wave-shaped undulate upside down, and the velocity distribution of the internal waves is asymmetric, but also through the simulation results of different seabed topography to understand the local vortex turbulence, wall friction and viscosity of the fluid to dissipate wave energy generated within the physical mechanism.

論文審定書 i
誌謝 ii
摘要 iii
Abstract iv
目錄 v
圖目錄 vii
表目錄 xv
符號說明 xvi
第一章 緒論 1
1.1前言 1
1.2文獻回顧 3
1.2.1 現場觀測研究 5
1.2.2 實驗室實驗研究 8
1.2.3 數值模擬 10
1.3 研究目的 11
1.4 本文架構 12
第二章 數值模式與理論 13
2.1 ANSYS FLUENT 軟體簡介 13
2.1.1 網格處理方式 14
2.1.2 自由液面和流體界面處理方法 15
2.2 基本統御方程式 16
2.2.1 Navier-Stokes控制方程式 16
2.2.2 ANSYS FLUENT 控制方程式 17
2.3 初始條件與邊界條件 18
2.4 類神經網路簡介 19
2.4.1 倒傳遞類神經網路 20
2.4.2倒傳遞類神經網路架構 22
2.4.3倒傳遞類神經網路演算法 24
2.4.4倒傳遞類神經網路參數設定 28
第三章 數值方法與模式驗證 30
3.1 數值方法與模式操作過程 30
3.1.1 數值方法 30
3.1.2 QUICK格式 32
3.1.3 PISO演算法 32
3.2 數值模式精確度測定和分析 34
3.3 研究流程圖 39
3.4 數值模式與實驗室結果波形比對 40
3.4.1孤立內波傳遞及在單斜坡上反射之實驗結果與數值波形比較 40
3.4.2 孤立內波傳遞及受障礙物影響之實驗結果與數值波形比較 45
第四章 結果與討論 51
4.1孤立內波通過平坦海床時對表面波之流場及水位影響 51
4.2孤立內波通過海底山脊等突起地形所形成的渦流效應與機制 69
4.2.1上舉型孤立內波通過海底山脊時對內部流場之相關特性探討 69
4.2.2下沉型孤立內波通過海底山脊時對內部流場之相關特性探討 82
4.3孤立內波通過海底海溝等穴槽所形成的渦流效應與機制探討 94
4.4將ANSYS FLUENT模擬結果應用並開發類神經網路預測模式 109
第五章 結論與建議 118
5.1 結論 118
5.2 建議與未來展望 120
參考文獻 122

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