臺灣博碩士論文加值系統

地球表面有70％為海洋所覆蓋，由於海洋本身受到地球自轉以及表面溫度循環變化等因素之影響，因此將使海洋環境之變化更趨於多樣性而更顯複雜，正如遠古的人類渴望能插上雙翅飛上九重藍天一樣，深不可測的海底世界早已是人類就想闖入的神秘王國；因此，在海洋工程研究領域中，有關水下潛體流場之研究一直是相當熱門的課題。為能正確掌握水下潛體運動性能，實際模擬水下潛體在動態運動過程中其週遭流場變化對潛體受力之影響，本論文將強調以「非結構性動態網格移動技術」來執行水下潛體運動流場之研究。而此項網格移動計算模式，將以網格重建與格點流場物量內插技術之概念為基礎完成移動物體之暫態流場計算。此外，為解析潛艦週遭之紊流流場特性，本論文將採工程中被廣泛應用的 紊流模式以及適切之潛體表面邊界函數，完成相關紊流流場之數值模擬。上述之數值計算方法，在本論文中已證實具有相當程度之實用性，未來將可被應用於有關水下儎具運動之各類複雜流場的模擬計算，以進一步提供國防軍事單位，作為武器裝備採購、艦船設計、船模試驗及戰術測評等先前作業時之科學評估方法。

The earth is covered by almost 70% of the oceans. Since the oceans undergoes the effects from the earth motion, temperature cycle etc., they are always moving, and the environment below the ocean surface is complicated all the time. As the ancients want to put wings to fly in the blue sky, the unknown deeply sea world has been the mystery kingdom that human being desire to explore. Therefore, among the research relevant to the ocean engineering, the submarine’s motion flow is always a focus in this field. In order to predict the behavior of the submarine motion correctly, the objective of this research is to develop the unstructured moving mesh technique to predict the hydrodynamic performance of such underwater military vehicle. A well-valid turbulence model with wall function treatment for the vicinity of body surface is employed to fulfill the submarine flow computations. The fluid meshes are unstructured triangular-typed meshes with moving mesh capability based on the mesh regeneration and interpolation techniques. The present numerical method, which is proven to be very practical, can be extended to account for the moving submerged-body flows to simulate the more complicated motion of an underwater vehicle in the ocean. In addition, the method applied in this research could also be a useful tool for the Navy to do the marine weapon-purchasing evaluation, vessel design, module of vessel testing, and tactics estimation.

誌謝 i
摘要 ii
ABSTRACT iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 xi
1. 緒論 1
1.1 前言 1
1.2 文獻回顧 3
1.3 研究目的與內容 7
2. 水下潛體流場分析與水動力係數計算之數值方法 9
2.1 分析水下潛體運動之流場統御方程式 9
2.2 流場計算域邊界條件之設定 12
2.3 有限體積數值法 14
2.4動態格點技術與非穩態水下儎具運動流場之計算 17
3. 動態運動模式下之潛艦二維流場數值模擬 21
3.1 潛艦水平潛航運動之流場數值模擬 22
3.2 潛艦八字型航跡運動之流場數值模擬 28
3.3 潛艦雙艘動態迴旋運動之流場數值模擬 34
4. 水下潛體三維動態運動流場模擬 40
4.1 魚雷彈體流場之數值模擬 40
4.1.1 固定魚雷彈體流場之數值模擬 41
4.1.2 移動魚雷彈體流場之數值模擬 46
4.1.3 魚雷彈體數值模擬阻力值與實驗值之比較分析 50
4.2潛艦運動流場之數值模擬 53
4.2.1 潛艦斜航運動之三維流場模擬 53
4.2.2 潛艦迴旋運動之三維流場模擬 71
5. 結論 76
參考文獻 78
自傳 82

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