计算物理 ›› 2008, Vol. 25 ›› Issue (5): 535-542.

• 研究论文 • 上一篇    下一篇

格子Boltzmann方法中三维运动边界的统一模型

刘演华, 林建忠, 库晓珂   

  1. 浙江大学力学系, 浙江 杭州 310027
  • 收稿日期:2007-03-29 修回日期:2007-11-19 出版日期:2008-09-25 发布日期:2008-09-25
  • 作者简介:刘演华(1981-),男,江苏,博士生,从事计算流体力学研究.
  • 基金资助:
    国家自然科学基金重点项目(No.10632070)资助项目

Unified Method for Three-dimensional Moving Boundary in Lattice Boitzmann Method

LIU Yanhua, LIN Jianzhong, KU Xiaoke   

  1. Department of Mechanics, Zhejiang University, Hangzhou 310027, China
  • Received:2007-03-29 Revised:2007-11-19 Online:2008-09-25 Published:2008-09-25

摘要: 格子Boltzmann方法(LBM)中边界条件的处理很复杂,在现有的边界条件处理方法中,动力学格式能够精确满足宏观边界条件,但由于要解一个不定方程,必须引入附加假设确保方程非奇异.作为动力学格式和反弹格式的一种扩展,提出一种处理三维任意速度运动边界的统一模型,其中入口速度和固体壁面速度是该模型的特殊情形.给出用于三维15速度的表达式.为了检验该模型,模拟对角顶盖驱动三维空腔流,并将结果与有限差分法计算的结果进行比较,说明所提出的统一模型是合理可行的.

关键词: 格子Boltzmann方法, 三维运动边界条件, 运动学格式, 顶盖驱动三维空腔流

Abstract: A unified method is proposed to treat 3D moving boundaries at arbitrary velocity as an extension of kinetic format and bounce-back format. Velocities at inlet and on solid wall are special cases of the model. A simplified expression is given in a three dimensional 15-velocity model. Numerical simulation for a diagonally lid-driven three-dimensional cavity flow is performed to verify this scheme. Compared with finite difference method (FDM), the proposed method proves reasonable.

Key words: lattice Boltzmann method, three-dimensional moving boundary condition, kinetic format, three-dlmensional diagonal lid-driven cavity flow

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