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MAC方法及其在铸造充型模拟中的应用
Application of the MAC Method in Casting Filling Simulation 在线阅读 下载PDF
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- DOI:
- 作者:
- 黄伟明 唐玉龙 宁林祥 吴棣 廖敦明
HUANG Weiming;TANG Yulong;NING Linxiang;WU Di;LIAO Dunming
- 作者单位:
- 浙江嘉善北方机械制造有限公司 华中科技大学材料科学与工程学院材料成形与模具技术国家重点实验室 浙江欧冶达机械制造股份有限公司
Zhejiang Beifang Machinery Manufacturing Co.,Ltd.,Jiaxing 314100,China;State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Zhejiang Ouyeda Machinery Manufacturing Co.,Ltd.,Huzhou 314200,China
- 关键词:
- MAC方法 半拉格朗日方法 铸造充型过程 流动模拟
marker-and-cell semi-Lagrangian method casting filling process fluid simulation
- 摘要:
- 介绍了一种基于MAC的半拉格朗日方法,用于模拟铸造充型过程中的金属流动。结合拉格朗日和欧拉两种方法的优点,将流体视为具有某些物理性质的大量粒子的集合,绕过了纯欧拉角度下的复杂自由界面跟踪问题。对于流体内部,采用投影法求解不可压缩N-S方程。通过将粒子携带的信息映射到网格上,在背景网格上求解扩散方程,避免了拉格朗日方法中场描述的不便。引入水平集方法描述边界。对比计算分析了该方法和广泛应用的VOF方法的两个实例。结果表明,该方法能产生尖锐、不连续的流体界面,更接近铸造过程,尤其适合于充型速度快的铸造过程。Marker-and-cell based semi-Lagrangian method,which combines the advantages of Lagrangian and Eulerian perspective,is introduced to simulate the metal flow during casting filling process.This method treats fluid in terms of a vast collection of particles with some physical properties that move around,naturally bypass the unique complex free interface tracking problem in Eulerian perspective.For the interior of the fluid,the efficient Projection method is used to solve the incompressible Navier-Stokes equations.On the other hand,the diffusion equation is solved on the background grid by mapping the information carried by the particles to the grid,thus avoiding the inconvenience of field description in Lagrangian perspective.And the level set method is introduced to describe boundary.In order to study the application of this method in the casting field,two examples are given with this method and the widely used VOF method.The results show that this method can produce sharp and discontinuous fluid interfaces,which is closer to the casting process with high filling speed.