橫搖運動是自升式風機安裝船重要的性能，因為它將直接影響船舶能否不受天候干擾如期執行任務。然而船舶橫搖運動的分析品質高度取決於橫搖阻尼估算的準確性。橫搖阻尼的非線性特性乃源自流體的黏性、以及船殼及其附屬物周遭流體剝離(separation)及渦旋洩離(vortex shedding)等相關現象。自升式風機安裝船其較為方形剖面的線型與巨大的外伸樁腳，於橫搖運動時將產生大量黏性與渦流阻尼。為了探討此類具下放樁腳且於靜止無前進速度條件下作業船舶的橫搖阻尼特性，本研究以流體動力計算的方法來計算模擬一自升式風機安裝船於靜水中的自然橫搖衰減運動。數值模擬乃以求解RANS方程的Fluent軟體為計算工具，除了將模擬所得橫搖結果與之前的試驗結果進行比較，並觀察計算過程流場所呈現之剝離與渦旋洩離等現象，進而嘗試分析其樁腳對於橫搖阻尼之影響。

Roll motion is a major concern of jack-up turbine installation vessels (TIV) because it has a direct impact on the downtime of the installation process owing to weather. The prediction of nonlinear roll motion of ships depends highly on the accurate estimation of roll damping. The nonlinear nature of roll damping arises from the viscous flow and the associated phenomenon of flow separation and vortex shedding around the ship hull and appendages. Sharp-cornered barge and long extracted legs of a TIV induce large viscous and eddy damping to the roll motion. To capture the roll characteristics with extracted legs in zero speed operational condition, CFD simulations of free roll decay of a TIV have been carried out in this study and results of time series of roll motions will be compared with those obtained from the previous experiments. In addition to comparing with the previous test results, the flow separations and vortex shedding from main hull and extracted legs during the calculation process have also been observed, and then try to analyze its influence on the roll damping. The numerical simulations will be carried out using the RANSE solver-Fluent. A good understanding of the viscous roll damping together with a validated software package that describes this, would cause the motion analysis to become more precise.

摘 要 II
Abstract III
目錄 V
圖目錄 VIII
表目錄 XII
符號表 XIII
第一章 前言 1
1.1研究動機 1
1.2文獻回顧 2
1.3本文架構 5
第二章 理論背景 6
2.1統御方程式 6
2.1.1質量守恆方程式 6
2.1.2動量守恆方程式 6
2.2流體體積法 7
2.3紊流方程式 8
2.3.1 RANS方程式 9
2.3.2紊流模型 10
2.4有限體積法 12
2.5流場速度壓力求解法 13
2.6 剛體運動方程式 13
第三章 網格檢驗及模擬配置 15
3.1計算例船模資訊 15
3.2流場設定及邊界條件 19
3.3網格建構 22
3.4 網格之Verification & Validation (V&V) 30
3.4.1 Verification (驗證) 30
3.4.2 Validation (確認) 31
3.5 Fluent求解步驟 32
3.6 近壁面區處理 36
第四章 模擬結果與探討 38
4.1 模擬計算結果與試驗比較 38
4.2 渦流分布與速度向量分布情況 40
4.2.1樁腳下放及樁腳未下放之渦量分布 43
4.2.2樁腳下放及樁腳未下放之速度向量分布 51
4.3 V&V結果分析 55
4.3.1網格獨立性分析 55
4.3.2網格不確定性分析 57
4.4 硬體設備與計算時間 58
第五章 結論與未來展望 59
參考文獻 60

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