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系統識別號 U0026-1708202004173700
論文名稱(中文) 在動態網格船模阻力試驗中改進垂直運動的預測
論文名稱(英文) Improvement of Vertical Motion Prediction for the Ship Model Resistance Test using Dynamic Mesh
校院名稱 成功大學
系所名稱(中) 系統及船舶機電工程學系
系所名稱(英) Department of Systems and Naval Mechatronic Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 廖偉智
研究生(英文) Wei-Zhi Liao
學號 P16071038
學位類別 碩士
語文別 中文
論文頁數 70頁
口試委員 指導教授-吳炳承
口試委員-方銘川
口試委員-陳建宏
口試委員-辛敬業
中文關鍵字 計算流體力學  OpenFOAM  阻力值  下沉量  俯仰量 
英文關鍵字 CFD  Center of gravity  Wave pattern  Nominal wake 
學科別分類
中文摘要 本研究是針對公開油輪船型KVLCC2使用OpenFOAM軟體進行計算流體力學分析。本研究分別採用靜態網格與動態網格達成船舶阻力試驗的模擬,並觀察艉跡流與船體造波之波浪的分布情形。其中靜態網格僅對阻力值進行預估;動態網格則是對阻力值、俯仰量 (Trim)、下沉量 (Sinkage) 進行預估。其中俯仰量與下沉量為微小數值,在單純使用實驗船模參數 (如質量和重心位置) 進行模擬時,容易因為船模圖檔在離散化或是網格建立後和真實幾何間產生微小的誤差,進而改變船模的移動和旋轉中心,最終造成過大的模擬誤差。本研究提供改善此現象的方法: XCG (Center of gravity in x direction) 修正流程,並且證實有效修正俯仰量與下沉量過大誤差的問題。
英文摘要 The study is to use OpenFOAM for computational fluid dynamics (CFD) analysis. Static and dynamic grid were used. Static grid is only used to predict ship hull resistance, and dynamic grid is used to predict ship hull resistance, trim and sinkage. The nominal wake profile and ship wave pattern were observed. The trim and sinkage are very small values, so for their prediction the large error was obtained by using experiment data (such as mass and center of gravity). Through numerical discretization process and when the grid attached to the hull surface, it caused slight deviation between the ship geometries used in CFD simulation and the original IGS file. Furthermore, ship model initial motion and rotation center would be changed. In the end, these reasons cause large error. The study provides the solution of this situation by a XCG (Center of gravity in x direction) correction process. The results of trim and sinkage value were significantly improved.
論文目次 目錄
摘要 I
目錄 VII
圖目錄 IX
表目錄 XI
符號說明 XII
第一章 前言 1
1-1研究動機與目的 1
1-2文獻回顧 2
第二章 理論背景 5
2-1前提假設 5
2-2統御方程式 5
2.2.1質量守恆方程式 5
2.2.2動量方程式 5
2.2.3流體體積法 6
2.2.4剛體運動方程式 6
2.2.5流固耦合數值計算 7
2-3 紊流模型 8
2.3.1 RANS方程式 8
2.3.2 SST k-ω模型 9
2-4 壁面函數 12
2-5 有限體積法 14
2-6 阻力成分 16
第三章 數值方法 18
3-1流場設計 18
3.1.1 模型尺寸 18
3.1.2 流場設定 20
3-2 XCG修正 27
3-3 驗證與確認理論 (Verification & Validation) 28
3-4 網格驗證與加強 30
3-5 網格品質檢查 33
第四章 結果分析 36
4-1數值分析 36
4.1.1 驗證與確認結果 36
4.1.2 阻力分析 38
4.1.3 下沉量與俯仰量分析 40
4-2 波浪分布圖與艉跡流圖 43
4.2.1 靜態網格波浪分布圖 43
4.2.2 靜態網格艉跡流圖 45
4.2.3 動態網格波浪分布圖 50
4.2.4 動態網格艉跡流圖 52
4.2.5 修正XCG後的動態網格波浪分布圖 55
4.2.6 修正XCG後的動態網格艉跡流圖 56
4-3 三種不同虛螺轂探討 60
4.3.1 三種虛螺轂 60
4.3.2 阻力分析 63
4.3.3 波浪分布圖與艉跡流圖 64
第五章 總結與未來展望 67
參考資料 69
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