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研究生: 張茗翔
Chang, Ming-Hsiang
論文名稱: 晶格波茲曼法在黏性流的計算
Viscous Flow Computations with Lattice Boltzmann Method
指導教授: 林三益
Lin, San-Yih
學位類別: 碩士
Master
系所名稱: 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年: 2006
畢業學年度: 94
語文別: 中文
論文頁數: 95
中文關鍵詞: 粒子與流體的交互作用沉浸邊界法晶格波茲曼法
外文關鍵詞: Immersed boundary method, fluid-particle interaction, Lattice Boltzmann Method
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  • 晶格波茲曼法(Lattice Boltzmann Method)是以微觀的角度來計算具有黏滯力的不可壓縮流場。本文主要除了使用常見的單一鬆弛時間晶格波茲曼法外,另外還包含有限差分下的晶格波茲曼法,以及配合沉浸邊界的晶格波茲曼法。
    在晶格波茲曼法中,分別介紹開放、固體邊界和二階曲線邊界的處理方法。由於均勻格點無法靈活地運用在各種曲線邊界下,因此發展了在有限差分下的晶格波茲曼法。在此方法中,計算格點可以彈性使用各種適合於物體邊界的曲線不均勻格點。
    沉浸邊界晶格波茲曼法,是組合並利用沉浸邊界法和晶格波茲曼法所擁有的特點。利用此沉浸邊界晶格波茲曼法,來探討流場中粒子受到周圍流場作用力後的運動行為,以及兩顆和多顆粒子在流場中對於流體與粒子以及粒子與粒子交互作用後的運動行為。

    The Lattice Boltzmann Method(LBM)is a microscopic-based approach for solving the incompressible viscous flows. The numerical methods include the single relaxation time lattice Boltzmann method, the finite difference-based lattice Boltzmann method, and the immersed boundary-lattice Boltzmann method.
    Three boundary conditions, open boundary, solid boundary and solid second-order curve boundary are applied in the LBM to handle the flow over a solid body. The finite difference-based lattice Boltzmann method using body-fitted curvilinear coordinates is invented to simulate the flows over complex configuration.
    To study the fluid-particle interaction problems, The immersed boundary-lattice Boltzmann method is developed. The flow velocity field and particles are solved by adding a force density term into the lattice Boltzmann equation.

    中文摘要 I 英文摘要 II 致 謝 III 目 錄 IV 圖目錄 VI 表目錄 X 第一章 緒 論 1 第二章 數值方法 8 2.1 晶格波茲曼法 8 2.1.1 由晶格波茲曼方程式到Navier-Stokes方程式 9 2.1.2 邊界條件 17 2.1.3 力量估算 23 2.2 有限差分下的晶格波茲曼法 27 2.2.1 晶格波茲曼方程式的有限微分 27 2.2.2 邊界條件 30 2.3 沉浸邊界晶格波茲曼法 31 2.3.1 沉浸邊界法 31 2.3.2 粒子碰撞 36 第三章 程式驗證 39 3.1 空穴流 39 3.2 圓柱形Couette Flow 42 3.2.1 從靜止狀態到開始推動的圓柱形Couette Flow 42 3.2.2 穩定狀態的Couette Flow 43 3.3 穩定流場通過二維圓柱 44 第四章 結果與討論 72 4.1 單一粒子的沉降 72 4.2 兩顆粒子的沉降 74 4.3 多顆粒子在容器內的沉降行為 76 第五章 結 論 90 參考文獻 92 自 述 95

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