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研究生： 歐豐賢
Ou, Feng-Hsien
論文名稱： 以OpenFOAM發展粉床融合之數值模型
Development of Numerical Models for Powder Bed Fusion under OpenFOAM Framework
指導教授： 曾建洲
Tseng, Chien-Chou
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2022
畢業學年度： 110
語文別： 英文
論文頁數： 45
中文關鍵詞： 可壓縮性 、OpenFOAM 、質量守恆 、粉床融合 、馬倫格尼效應 、回衝壓力 、表面張力 、演算法
外文關鍵詞： compressibility, OpenFOAM, mass conservation, powder bed fusion, Marangoni effects, recoil pressure, surface tension, algorithm
相關次數： 點閱：89  下載：17 
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    • 此篇論文使用數值模擬研究粉床融合加工時的融池流況。文中利用C++開源計算流體力學程式庫OpenFOAM建置一套求解程式模擬。數個有關內部流況以及熱傳也加入數值方程式內以求模擬準確。此外，連接壓力及密度的可壓縮性方程式也被考量進來作為原質量守恆問題的改進。文末有數值預測和實驗結果的對照驗證，以及熔池內流況分析。

    The thesis applies a numerical simulation to study the flow motion of the melt pool in the process of powder bed fusion. A solver under the framework of a free-source computer fluid dynamics C++ toolbox OpenFOAM is developed to run the simulation. Several numerical models that involve in the flow motion and heat transfer in the melt pool are developed to improve the accuracy on simulation. Also, compressibility equation between the pressure and density has been applied in the simulation to improve the lack of mass conservation. Validations between prediction from numerical solver and experimental observations, and the flow motion simulated by the solver are discussed at the end of the content.

    摘要 I Abstract II 致謝 III Acknowledgements IV Table of Contents V List of Figures VII List of Tables IX Explanation of Symbols X Chapter 1 Introduction 1 1.1 Background 1 1.2 Literature Review 3 1.3 Scope of the Thesis 6 Chapter 2 Numerical Methods 7 2.1 Governing Equation 7 2.1.1 Continuity Equation and Volume of Fluid Method 7 2.1.2 Momentum Equation 8 2.1.3 Energy Equation 12 2.2 Solver Structure and Algorithm 13 2.2.1 OpenFOAM 13 2.2.2 Pressure-Velocity Coupling 14 2.2.3 Problem from VoF Equation of OpenFOAM and Improvement 18 2.2.4 Solver Procedure and Setup 21 2.3 Numerical Model Setup 23 Chapter 3 Validations and Discussion 30 3.1 Validation 30 3.2 Flow Motion in Melt Pool 31 3.2.1 Cross-sectional plane 31 3.2.2 Symmetry Plane and 3D view 34 Chapter 4 Conclusion and Expectation 42 Bibliography 43

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