蛋形顆粒群之流固耦合分析;Interaction Analysis of Egg-Shaped Particles with Fluid

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题名:	蛋形顆粒群之流固耦合分析;Interaction Analysis of Egg-Shaped Particles with Fluid
作者:	周超;Chao,Zhou
贡献者:	土木工程學系
关键词:	流體體積法;離散元素法;流固耦合;大渦模擬;蛋形顆粒;Volume of Fluid method;Discrete Element Method;Fluid-Solid interaction;Large Eddy simulation;Egg-shaped particle
日期:	2016-07-12
上传时间:	2016-10-13 12:06:38 (UTC+8)
出版者:	國立中央大學
摘要:	本文採一種雙向流動態耦合數值分析法來模擬蛋形顆粒在流體中的運動。該模擬在一個固定歐拉網格下實現。採用流體體積法(Volume of Fluid method)來描述多相液体介面和固液介面。通過大渦模擬(Large Eddy Simulation)求解流場壓力，再將顆粒表面受力積分求得流體對固體作用力。流體固體相互作用通過由固體邊界速度指定網格面速度來實現。顆粒的運動軌跡和顆粒間的碰撞則通過離散元素法(Discrete Element Method)跟踪，顆粒間的相互作用力基于彈性力學接觸理論。本論文首先使用該耦合模型模擬了單顆粒的運動，並與實驗結果進行比對。然後用此數值方法模擬了不同形狀卵形顆粒和多顆粒的沉降與碰撞行為。;In this thesis, we adopted a two-way dynamic coupled numerical method to simulate the motion of egg-shaped particles in fluid. The simulation is actualized in a fixed Eulerian grid. The Volume of Fluid (VOF) method is used to track the fluid-fluid and solid-fluid interfaces. Apply the Large Eddy simulation (LES) to solve the flow field stress, and then integral the traction on the particle surface to obtain the hydrodynamic force on the structure. The fluid-solid interaction is realized by specifying the cell-face velocity which is designated by the velocity of the structure boundary. The particle trajectories and collisions between the particles are calculated by the discrete element method (DEM), and the interaction forces between the particles are based on the elastic contact theory. The accuracy of this analysis method is verified by simulating the motion of a single egg-shaped particle and compared with the experimental results. Examples of settlement of a single particle and collision of particles are simulated by the numerical method.
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